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BPI-CM9-Linux/aml-comp/kernel/aml-6.12/common_drivers/drivers/gpio/pinctrl/pinctrl-meson.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Pin controller and GPIO driver for Amlogic Meson SoCs
*
* Copyright (C) 2014 Beniamino Galvani <[email protected]>
*/
/*
* The available pins are organized in banks (A,B,C,D,E,X,Y,Z,AO,
* BOOT,CARD for meson6, X,Y,DV,H,Z,AO,BOOT,CARD for meson8 and
* X,Y,DV,H,AO,BOOT,CARD,DIF for meson8b) and each bank has a
* variable number of pins.
*
* The AO bank is special because it belongs to the Always-On power
* domain which can't be powered off; the bank also uses a set of
* registers different from the other banks.
*
* For each pin controller there are 4 different register ranges that
* control the following properties of the pins:
* 1) pin muxing
* 2) pull enable/disable
* 3) pull up/down
* 4) GPIO direction, output value, input value
*
* In some cases the register ranges for pull enable and pull
* direction are the same and thus there are only 3 register ranges.
*
* Since Meson G12A SoC, the ao register ranges for gpio, pull enable
* and pull direction are the same, so there are only 2 register ranges.
*
* For the pull and GPIO configuration every bank uses a contiguous
* set of bits in the register sets described above; the same register
* can be shared by more banks with different offsets.
*
* In addition to this there are some registers shared between all
* banks that control the IRQ functionality. This feature is not
* supported at the moment by the driver.
*/
#include <linux/device.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/property.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/string.h>
#include <linux/string_helpers.h>
#include <linux/ctype.h>
#include <pinctrl/core.h>
#include <pinctrl/pinctrl-utils.h>
#include <regmap/internal.h>
#include <linux/kprobes.h>
#include <linux/highmem.h>
#include <linux/amlogic/gpiolib.h>
#include <linux/proc_fs.h>
#include <gpiolib.h>
#include "pinctrl-meson.h"
#include "pinctrl-meson-axg-pmx.h"
#ifdef CONFIG_AMLOGIC_MODIFY
#define PIN_CONFIG_VIN_THRESHOLD (PIN_CONFIG_END + 1)
static const struct pinconf_generic_params meson_extr_pinconf[] = {
{"vin-threshold", PIN_CONFIG_VIN_THRESHOLD, 0},
};
#ifdef CONFIG_DEBUG_FS
static const struct pin_config_item meson_extr_conf_items[] = {
PCONFDUMP(PIN_CONFIG_VIN_THRESHOLD, "vin threshold", NULL, true),
};
#endif
static int meson_memory_duplicate(struct platform_device *pdev, void **addr,
size_t n, size_t size)
{
void *mem;
if (!(*addr))
return -EINVAL;
mem = devm_kzalloc(&pdev->dev, size * n, GFP_KERNEL);
if (!mem)
return -ENOMEM;
memcpy(mem, *addr, size * n);
*addr = mem;
return 0;
};
#endif
static const unsigned int meson_bit_strides[] = {
#ifndef CONFIG_AMLOGIC_MODIFY
1, 1, 1, 1, 1, 2, 1
#else
1, 1, 1, 1, 1, 2, 1, 1
#endif
};
/**
* meson_get_bank() - find the bank containing a given pin
*
* @pc: the pinctrl instance
* @pin: the pin number
* @bank: the found bank
*
* Return: 0 on success, a negative value on error
*/
static int meson_get_bank(struct meson_pinctrl *pc, unsigned int pin,
struct meson_bank **bank)
{
int i;
for (i = 0; i < pc->data->num_banks; i++) {
if (pin >= pc->data->banks[i].first &&
pin <= pc->data->banks[i].last) {
*bank = &pc->data->banks[i];
return 0;
}
}
return -EINVAL;
}
/**
* meson_calc_reg_and_bit() - calculate register and bit for a pin
*
* @bank: the bank containing the pin
* @pin: the pin number
* @reg_type: the type of register needed (pull-enable, pull, etc...)
* @reg: the computed register offset
* @bit: the computed bit
*/
static void meson_calc_reg_and_bit(struct meson_bank *bank, unsigned int pin,
enum meson_reg_type reg_type,
unsigned int *reg, unsigned int *bit)
{
struct meson_reg_desc *desc = &bank->regs[reg_type];
*bit = (desc->bit + pin - bank->first) * meson_bit_strides[reg_type];
*reg = (desc->reg + (*bit / 32)) * 4;
*bit &= 0x1f;
}
static int meson_get_groups_count(struct pinctrl_dev *pcdev)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->num_groups;
}
static const char *meson_get_group_name(struct pinctrl_dev *pcdev,
unsigned int selector)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->groups[selector].name;
}
static int meson_get_group_pins(struct pinctrl_dev *pcdev, unsigned int selector,
const unsigned int **pins, unsigned int *num_pins)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
*pins = pc->data->groups[selector].pins;
*num_pins = pc->data->groups[selector].num_pins;
return 0;
}
static void meson_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s,
unsigned int offset)
{
seq_printf(s, " %s", dev_name(pcdev->dev));
}
static const struct pinctrl_ops meson_pctrl_ops = {
.get_groups_count = meson_get_groups_count,
.get_group_name = meson_get_group_name,
.get_group_pins = meson_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
.dt_free_map = pinctrl_utils_free_map,
.pin_dbg_show = meson_pin_dbg_show,
};
int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->num_funcs;
}
EXPORT_SYMBOL(meson_pmx_get_funcs_count);
const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev,
unsigned int selector)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->funcs[selector].name;
}
EXPORT_SYMBOL(meson_pmx_get_func_name);
int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned int selector,
const char * const **groups,
unsigned * const num_groups)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
*groups = pc->data->funcs[selector].groups;
*num_groups = pc->data->funcs[selector].num_groups;
return 0;
}
EXPORT_SYMBOL(meson_pmx_get_groups);
static int meson_pinconf_set_gpio_bit(struct meson_pinctrl *pc,
unsigned int pin,
unsigned int reg_type,
bool arg)
{
struct meson_bank *bank;
unsigned int reg, bit;
int ret;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, reg_type, &reg, &bit);
return regmap_update_bits(pc->reg_gpio, reg, BIT(bit),
arg ? BIT(bit) : 0);
}
static int meson_pinconf_get_gpio_bit(struct meson_pinctrl *pc,
unsigned int pin,
unsigned int reg_type)
{
struct meson_bank *bank;
unsigned int reg, bit, val;
int ret;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, reg_type, &reg, &bit);
ret = regmap_read(pc->reg_gpio, reg, &val);
if (ret)
return ret;
return BIT(bit) & val ? 1 : 0;
}
static int meson_pinconf_set_output(struct meson_pinctrl *pc,
unsigned int pin,
bool out)
{
return meson_pinconf_set_gpio_bit(pc, pin, REG_DIR, !out);
}
static int meson_pinconf_get_output(struct meson_pinctrl *pc,
unsigned int pin)
{
int ret = meson_pinconf_get_gpio_bit(pc, pin, REG_DIR);
if (ret < 0)
return ret;
return !ret;
}
static int meson_pinconf_set_drive(struct meson_pinctrl *pc,
unsigned int pin,
bool high)
{
return meson_pinconf_set_gpio_bit(pc, pin, REG_OUT, high);
}
static int meson_pinconf_get_drive(struct meson_pinctrl *pc,
unsigned int pin)
{
return meson_pinconf_get_gpio_bit(pc, pin, REG_OUT);
}
static int meson_pinconf_set_output_drive(struct meson_pinctrl *pc,
unsigned int pin,
bool high)
{
int ret;
#ifndef CONFIG_AMLOGIC_MODIFY
ret = meson_pinconf_set_output(pc, pin, true);
if (ret)
return ret;
return meson_pinconf_set_drive(pc, pin, high);
#else
ret = meson_pinconf_set_drive(pc, pin, high);
if (ret)
return ret;
return meson_pinconf_set_output(pc, pin, true);
#endif
}
static int meson_pinconf_disable_bias(struct meson_pinctrl *pc,
unsigned int pin)
{
struct meson_bank *bank;
unsigned int reg, bit = 0;
int ret;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg, &bit);
ret = regmap_update_bits(pc->reg_pullen, reg, BIT(bit), 0);
if (ret)
return ret;
return 0;
}
static int meson_pinconf_enable_bias(struct meson_pinctrl *pc, unsigned int pin,
bool pull_up)
{
struct meson_bank *bank;
unsigned int reg, bit, val = 0;
int ret;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
if (pull_up)
val = BIT(bit);
ret = regmap_update_bits(pc->reg_pull, reg, BIT(bit), val);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg, &bit);
ret = regmap_update_bits(pc->reg_pullen, reg, BIT(bit), BIT(bit));
if (ret)
return ret;
return 0;
}
static int meson_pinconf_set_drive_strength(struct meson_pinctrl *pc,
unsigned int pin,
u16 drive_strength_ua)
{
struct meson_bank *bank;
unsigned int reg, bit, ds_val;
int ret;
if (!pc->reg_ds) {
dev_err(pc->dev, "drive-strength not supported\n");
return -ENOTSUPP;
}
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_DS, &reg, &bit);
if (drive_strength_ua <= 500) {
ds_val = MESON_PINCONF_DRV_500UA;
} else if (drive_strength_ua <= 2500) {
ds_val = MESON_PINCONF_DRV_2500UA;
} else if (drive_strength_ua <= 3000) {
ds_val = MESON_PINCONF_DRV_3000UA;
} else if (drive_strength_ua <= 4000) {
ds_val = MESON_PINCONF_DRV_4000UA;
} else {
dev_warn_once(pc->dev,
"pin %u: invalid drive-strength : %d , default to 4mA\n",
pin, drive_strength_ua);
ds_val = MESON_PINCONF_DRV_4000UA;
}
if (BIT(ds_val) & pc->data->ds_mask) {
dev_err(pc->dev, "unsupported drive strength: ds%u\n", ds_val);
return -EOPNOTSUPP;
}
ret = regmap_update_bits(pc->reg_ds, reg, 0x3 << bit, ds_val << bit);
if (ret)
return ret;
return 0;
}
#ifdef CONFIG_AMLOGIC_MODIFY
static int meson_pinconf_set_vthx(struct meson_pinctrl *pc, unsigned int pin,
u32 ref_arg)
{
struct meson_bank *bank;
unsigned int reg, bit;
int ret;
if (!pc->reg_vthx) {
dev_err(pc->dev, "vin-threshold not supported\n");
return -EOPNOTSUPP;
}
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_VTHX, &reg,
&bit);
return regmap_update_bits(pc->reg_vthx, reg, BIT(bit),
!!ref_arg ? BIT(bit) : 0);
}
static int meson_pinconf_get_vthx(struct meson_pinctrl *pc, unsigned int pin,
u16 *arg)
{
struct meson_bank *bank;
unsigned int reg, bit, val;
int ret;
if (!pc->reg_vthx)
return -EOPNOTSUPP;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_VTHX, &reg, &bit);
ret = regmap_read(pc->reg_pullen, reg, &val);
if (ret)
return ret;
*arg = !!(val & BIT(bit));
return 0;
}
#endif
static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
unsigned long *configs, unsigned int num_configs)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
unsigned int param;
unsigned int arg = 0;
int i, ret;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
switch (param) {
case PIN_CONFIG_DRIVE_STRENGTH_UA:
#ifdef CONFIG_AMLOGIC_MODIFY
case PIN_CONFIG_INPUT_ENABLE:
case PIN_CONFIG_VIN_THRESHOLD:
#endif
case PIN_CONFIG_OUTPUT_ENABLE:
case PIN_CONFIG_OUTPUT:
arg = pinconf_to_config_argument(configs[i]);
break;
default:
break;
}
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
ret = meson_pinconf_disable_bias(pc, pin);
break;
case PIN_CONFIG_BIAS_PULL_UP:
ret = meson_pinconf_enable_bias(pc, pin, true);
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
ret = meson_pinconf_enable_bias(pc, pin, false);
break;
case PIN_CONFIG_DRIVE_STRENGTH_UA:
ret = meson_pinconf_set_drive_strength(pc, pin, arg);
break;
case PIN_CONFIG_OUTPUT_ENABLE:
ret = meson_pinconf_set_output(pc, pin, arg);
break;
case PIN_CONFIG_OUTPUT:
ret = meson_pinconf_set_output_drive(pc, pin, arg);
break;
#ifdef CONFIG_AMLOGIC_MODIFY
case PIN_CONFIG_INPUT_ENABLE:
ret = meson_pinconf_set_output(pc, pin, !arg);
break;
case PIN_CONFIG_VIN_THRESHOLD:
ret = meson_pinconf_set_vthx(pc, pin, arg);
break;
#endif
default:
ret = -ENOTSUPP;
}
if (ret)
return ret;
}
return 0;
}
static int meson_pinconf_get_pull(struct meson_pinctrl *pc, unsigned int pin)
{
struct meson_bank *bank;
unsigned int reg, bit, val;
int ret, conf;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg, &bit);
ret = regmap_read(pc->reg_pullen, reg, &val);
if (ret)
return ret;
if (!(val & BIT(bit))) {
conf = PIN_CONFIG_BIAS_DISABLE;
} else {
meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
ret = regmap_read(pc->reg_pull, reg, &val);
if (ret)
return ret;
if (val & BIT(bit))
conf = PIN_CONFIG_BIAS_PULL_UP;
else
conf = PIN_CONFIG_BIAS_PULL_DOWN;
}
return conf;
}
static int meson_pinconf_get_drive_strength(struct meson_pinctrl *pc,
unsigned int pin,
u16 *drive_strength_ua)
{
struct meson_bank *bank;
unsigned int reg, bit;
unsigned int val;
int ret;
if (!pc->reg_ds)
return -ENOTSUPP;
ret = meson_get_bank(pc, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_DS, &reg, &bit);
ret = regmap_read(pc->reg_ds, reg, &val);
if (ret)
return ret;
switch ((val >> bit) & 0x3) {
case MESON_PINCONF_DRV_500UA:
*drive_strength_ua = 500;
break;
case MESON_PINCONF_DRV_2500UA:
*drive_strength_ua = 2500;
break;
case MESON_PINCONF_DRV_3000UA:
*drive_strength_ua = 3000;
break;
case MESON_PINCONF_DRV_4000UA:
*drive_strength_ua = 4000;
break;
}
return 0;
}
static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin,
unsigned long *config)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
unsigned int param = pinconf_to_config_param(*config);
u16 arg;
int ret;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_PULL_UP:
if (meson_pinconf_get_pull(pc, pin) == param)
arg = 1;
else
return -EINVAL;
break;
case PIN_CONFIG_DRIVE_STRENGTH_UA:
ret = meson_pinconf_get_drive_strength(pc, pin, &arg);
if (ret)
return ret;
break;
case PIN_CONFIG_OUTPUT_ENABLE:
ret = meson_pinconf_get_output(pc, pin);
if (ret <= 0)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_OUTPUT:
ret = meson_pinconf_get_output(pc, pin);
if (ret <= 0)
return -EINVAL;
ret = meson_pinconf_get_drive(pc, pin);
if (ret < 0)
return -EINVAL;
arg = ret;
break;
#ifdef CONFIG_AMLOGIC_MODIFY
case PIN_CONFIG_VIN_THRESHOLD:
if (meson_pinconf_get_vthx(pc, pin, &arg) < 0)
return -EINVAL;
break;
#endif
default:
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
dev_dbg(pc->dev, "pinconf for pin %u is %lu\n", pin, *config);
return 0;
}
static int meson_pinconf_group_set(struct pinctrl_dev *pcdev,
unsigned int num_group,
unsigned long *configs, unsigned int num_configs)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
struct meson_pmx_group *group = &pc->data->groups[num_group];
int i;
dev_dbg(pc->dev, "set pinconf for group %s\n", group->name);
for (i = 0; i < group->num_pins; i++) {
meson_pinconf_set(pcdev, group->pins[i], configs,
num_configs);
}
return 0;
}
static int meson_pinconf_group_get(struct pinctrl_dev *pcdev,
unsigned int group, unsigned long *config)
{
return -ENOTSUPP;
}
static const struct pinconf_ops meson_pinconf_ops = {
.pin_config_get = meson_pinconf_get,
.pin_config_set = meson_pinconf_set,
.pin_config_group_get = meson_pinconf_group_get,
.pin_config_group_set = meson_pinconf_group_set,
.is_generic = true,
};
static int meson_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
{
struct meson_pinctrl *pc = gpiochip_get_data(chip);
int ret;
ret = meson_pinconf_get_output(pc, gpio);
if (ret < 0)
return ret;
return ret ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
}
static int meson_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio)
{
return meson_pinconf_set_output(gpiochip_get_data(chip), gpio, false);
}
static int meson_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
int value)
{
return meson_pinconf_set_output_drive(gpiochip_get_data(chip),
gpio, value);
}
static void meson_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
{
meson_pinconf_set_drive(gpiochip_get_data(chip), gpio, value);
}
static int meson_gpio_get(struct gpio_chip *chip, unsigned int gpio)
{
struct meson_pinctrl *pc = gpiochip_get_data(chip);
unsigned int reg, bit, val;
struct meson_bank *bank;
int ret;
ret = meson_get_bank(pc, gpio, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, gpio, REG_IN, &reg, &bit);
ret = regmap_read(pc->reg_gpio, reg, &val);
if (ret)
return ret;
return !!(val & BIT(bit));
}
#ifdef CONFIG_AMLOGIC_MODIFY
static int meson_gpio_to_irq(struct gpio_chip *chip, unsigned int gpio)
{
struct meson_pinctrl *pc = gpiochip_get_data(chip);
struct meson_bank *bank;
struct irq_fwspec fwspec;
int hwirq;
if (meson_get_bank(pc, gpio, &bank))
return -EINVAL;
if (bank->irq_first < 0) {
dev_warn(pc->dev, "no support irq for pin[%d]\n", gpio);
return -EINVAL;
}
if (!pc->of_irq) {
dev_err(pc->dev, "invalid device node of gpio INTC\n");
return -EINVAL;
}
hwirq = gpio - bank->first + bank->irq_first;
fwspec.fwnode = of_node_to_fwnode(pc->of_irq);
fwspec.param_count = 2;
fwspec.param[0] = hwirq;
fwspec.param[1] = IRQ_TYPE_NONE;
return irq_create_fwspec_mapping(&fwspec);
}
#endif
static int meson_gpiolib_register(struct meson_pinctrl *pc)
{
int ret;
const char **names;
const struct pinctrl_pin_desc *pins;
int i;
pc->chip.label = pc->data->name;
pc->chip.parent = pc->dev;
pc->chip.request = gpiochip_generic_request;
pc->chip.free = gpiochip_generic_free;
pc->chip.get_direction = meson_gpio_get_direction;
pc->chip.direction_input = meson_gpio_direction_input;
pc->chip.direction_output = meson_gpio_direction_output;
pc->chip.get = meson_gpio_get;
pc->chip.set = meson_gpio_set;
#ifdef CONFIG_AMLOGIC_MODIFY
pc->chip.to_irq = meson_gpio_to_irq;
pc->chip.set_config = gpiochip_generic_config;
names = kcalloc(pc->desc.npins, sizeof(char *), GFP_KERNEL);
if (!names)
return -ENOMEM;
pins = pc->desc.pins;
for (i = 0; i < pc->desc.npins; i++)
names[pins[i].number] = pins[i].name;
pc->chip.names = (const char * const *)names;
#endif
pc->chip.base = -1;
pc->chip.ngpio = pc->data->num_pins;
pc->chip.can_sleep = false;
pc->chip.fwnode = pc->fwnode;
ret = gpiochip_add_data(&pc->chip, pc);
/* pin->chip.names will be assigned to each gpio discriptor' name
* member after gpiochip_add_data. To keep node name consistency when
* use sysfs to export gpio, pc->chip.name need to be cleared also see
* gpiod_export->device_create_with_groups.
*/
kfree(names);
names = NULL;
pc->chip.names = NULL;
if (ret) {
dev_err(pc->dev, "can't add gpio chip %s\n",
pc->data->name);
return ret;
}
#if IS_ENABLED(CONFIG_AMLOGIC_GPIOLIB_SYSFS)
gpiochip_sysfs_register(pc->chip.gpiodev);
#endif
return 0;
}
static struct regmap_config meson_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
#if IS_ENABLED(CONFIG_PREEMPT_RT)
.fast_io = true,
.use_raw_spinlock = true,
#endif
};
static struct regmap *meson_map_resource(struct meson_pinctrl *pc,
struct device_node *node, char *name)
{
struct resource res;
void __iomem *base;
int i;
i = of_property_match_string(node, "reg-names", name);
if (of_address_to_resource(node, i, &res))
return NULL;
base = devm_ioremap_resource(pc->dev, &res);
if (IS_ERR(base))
return ERR_CAST(base);
meson_regmap_config.max_register = resource_size(&res) - 4;
meson_regmap_config.name = devm_kasprintf(pc->dev, GFP_KERNEL,
"%pOFn-%s", node,
name);
if (!meson_regmap_config.name)
return ERR_PTR(-ENOMEM);
return devm_regmap_init_mmio(pc->dev, base, &meson_regmap_config);
}
static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
struct device_node *node)
{
struct device_node *gpio_np;
unsigned int chips;
#ifdef CONFIG_AMLOGIC_MODIFY
#ifndef CONFIG_AMLOGIC_ZAPPER_CUT
int num, idx;
struct meson_pmx_expand_reg *pmx_expand_reg;
u32 val;
#endif
#endif
chips = gpiochip_node_count(pc->dev);
if (!chips) {
dev_err(pc->dev, "no gpio node found\n");
return -EINVAL;
}
if (chips > 1) {
dev_err(pc->dev, "multiple gpio nodes\n");
return -EINVAL;
}
pc->fwnode = gpiochip_node_get_first(pc->dev);
gpio_np = to_of_node(pc->fwnode);
#ifdef CONFIG_AMLOGIC_MODIFY
if (of_property_read_bool(node, "amlogic,ao-interrupt-controller")) {
pc->of_irq = of_find_compatible_node(NULL,
NULL,
"amlogic,meson-gpio-ao-intc");
} else {
pc->of_irq = of_find_compatible_node(NULL,
NULL,
"amlogic,meson-gpio-intc-ext");
if (!pc->of_irq)
pc->of_irq = of_find_compatible_node(NULL,
NULL,
"amlogic,meson-gpio-intc");
}
#endif
pc->reg_mux = meson_map_resource(pc, gpio_np, "mux");
#ifdef CONFIG_AMLOGIC_MODIFY
if (IS_ERR(pc->reg_mux))
pc->reg_mux = NULL;
#else
if (IS_ERR_OR_NULL(pc->reg_mux)) {
dev_err(pc->dev, "mux registers not found\n");
return pc->reg_mux ? PTR_ERR(pc->reg_mux) : -ENOENT;
}
#endif
pc->reg_gpio = meson_map_resource(pc, gpio_np, "gpio");
if (IS_ERR_OR_NULL(pc->reg_gpio)) {
dev_err(pc->dev, "gpio registers not found\n");
return pc->reg_gpio ? PTR_ERR(pc->reg_gpio) : -ENOENT;
}
pc->reg_pull = meson_map_resource(pc, gpio_np, "pull");
if (IS_ERR(pc->reg_pull))
pc->reg_pull = NULL;
pc->reg_pullen = meson_map_resource(pc, gpio_np, "pull-enable");
if (IS_ERR(pc->reg_pullen))
pc->reg_pullen = NULL;
pc->reg_ds = meson_map_resource(pc, gpio_np, "ds");
if (IS_ERR(pc->reg_ds)) {
dev_dbg(pc->dev, "ds registers not found - skipping\n");
pc->reg_ds = NULL;
}
#ifdef CONFIG_AMLOGIC_MODIFY
if (of_property_read_bool(gpio_np, "amlogic,vin-threshold-support"))
pc->reg_vthx = pc->reg_gpio;
#ifndef CONFIG_AMLOGIC_ZAPPER_CUT
/*
* There is a secondary selection mux on TXHD2,
* so this register needs to be used.
*/
num = of_property_count_strings(gpio_np, "mux-expand-name");
if (num > 0) {
pc->mux_expand_num = (unsigned int)num;
pc->mux_expand_reg = devm_kcalloc(pc->dev, pc->mux_expand_num,
sizeof(struct meson_pmx_expand_reg),
GFP_KERNEL);
if (!pc->mux_expand_reg)
return -ENOMEM;
pmx_expand_reg = pc->mux_expand_reg;
for (idx = 0; idx < num; idx++) {
if (of_property_read_string_index(gpio_np, "mux-expand-name",
idx, &pmx_expand_reg->name)) {
dev_err(pc->dev, "invalid mux expand name @ %pOFn\n", gpio_np);
return -EINVAL;
}
if (of_property_read_u32_index(gpio_np, "mux-expand-reg",
idx, &val)) {
dev_err(pc->dev, "invalid mux expand reg @ %pOFn\n", gpio_np);
return -EINVAL;
}
pmx_expand_reg->reg = devm_ioremap(pc->dev, val, 0x4);
if (!pmx_expand_reg->reg) {
dev_err(pc->dev, "failed to remap mux expand space\n");
return -EINVAL;
}
pmx_expand_reg++;
}
}
#endif
#endif
if (pc->data->parse_dt)
return pc->data->parse_dt(pc);
return 0;
}
int meson8_aobus_parse_dt_extra(struct meson_pinctrl *pc)
{
if (!pc->reg_pull)
return -EINVAL;
pc->reg_pullen = pc->reg_pull;
return 0;
}
#ifdef CONFIG_AMLOGIC_MODIFY
/*g12a/b/sm1/tm2/t5/t5d/ like old platform */
int meson_g12a_aobus_parse_dt_extra(struct meson_pinctrl *pc)
{
pc->reg_pull = pc->reg_gpio;
pc->reg_pullen = pc->reg_gpio;
return 0;
}
EXPORT_SYMBOL(meson_g12a_aobus_parse_dt_extra);
int meson_t5w_workaround_parse_dt_extra(struct meson_pinctrl *pc)
{
pc->reg_ds = pc->reg_mux;
return 0;
}
EXPORT_SYMBOL(meson_t5w_workaround_parse_dt_extra);
#endif
int meson_a1_parse_dt_extra(struct meson_pinctrl *pc)
{
pc->reg_pull = pc->reg_gpio;
pc->reg_pullen = pc->reg_gpio;
pc->reg_ds = pc->reg_gpio;
return 0;
}
EXPORT_SYMBOL(meson_a1_parse_dt_extra);
#if IS_ENABLED(CONFIG_AMLOGIC_GPIO_DEBUG)
static LIST_HEAD(pc_list);
static DEFINE_MUTEX(list_lock);
static void *get_symbol_addr(const char *symbol_name)
{
#ifdef CONFIG_KPROBES
struct kprobe kp = {
.symbol_name = symbol_name,
};
int ret;
ret = register_kprobe(&kp);
if (ret < 0) {
pr_err("register_kprobe:%s failed, returned %d\n", symbol_name, ret);
return NULL;
}
pr_debug("symbol_name:%s addr=%px\n", symbol_name, kp.addr);
unregister_kprobe(&kp);
return kp.addr;
#else
return (void *)kallsyms_lookup_name(symbol_name);
#endif
}
struct regmap_mmio_context {
void __iomem *regs;
unsigned int val_bytes;
bool attached_clk;
struct clk *clk;
void (*reg_write)(struct regmap_mmio_context *ctx,
unsigned int reg, unsigned int val);
unsigned int (*reg_read)(struct regmap_mmio_context *ctx,
unsigned int reg);
};
static int meson_axg_pmx_get_bank(struct meson_pinctrl *pc, unsigned int pin,
struct meson_pmx_bank **bank)
{
int i;
struct meson_axg_pmx_data *pmx = pc->data->pmx_data;
for (i = 0; i < pmx->num_pmx_banks; i++)
if (pin >= pmx->pmx_banks[i].first &&
pin <= pmx->pmx_banks[i].last) {
*bank = &pmx->pmx_banks[i];
return 0;
}
return -EINVAL;
}
static int meson_pmx_calc_reg_and_offset(struct meson_pmx_bank *bank,
unsigned int pin, unsigned int *reg,
unsigned int *offset)
{
int shift;
shift = pin - bank->first;
*reg = bank->reg + (bank->offset + (shift << 2)) / 32;
*offset = (bank->offset + (shift << 2)) % 32;
return 0;
}
static __nocfi u32 vaddr_to_paddr(unsigned long vaddr)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long paddr = 0;
struct mm_struct *local_init_mm = NULL;
pte_t * (*local_pte_offset_map)(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp);
#ifdef CONFIG_ARM64
pgd_t *pgd_f;
unsigned long long ttbr1_el1 = read_sysreg(ttbr1_el1);
ttbr1_el1 &= GENMASK_ULL(63, 12);
pgd_f = phys_to_virt(ttbr1_el1);
local_init_mm = container_of(&pgd_f, struct mm_struct, pgd);
#else
struct task_struct *task = NULL;
rcu_read_lock();
for_each_process(task) {
if (task->pid == 1) {
local_init_mm = task->active_mm;
break;
}
}
rcu_read_unlock();
if (!local_init_mm)
goto failed;
#endif
/* table walking */
pgd = pgd_offset(local_init_mm, vaddr);
if (pgd_none(*pgd) || pgd_bad(*pgd))
goto failed;
p4d = p4d_offset(pgd, vaddr);
if (p4d_none(*p4d) || p4d_bad(*p4d))
goto failed;
pud = pud_offset(p4d, vaddr);
if (pud_none(*pud) || pud_bad(*pud))
goto failed;
pmd = pmd_offset(pud, vaddr);
if (pmd_none(*pmd) || pmd_bad(*pmd))
goto failed;
local_pte_offset_map = (pte_t * (*)(pmd_t *pmd, unsigned long addr,
pmd_t *pmdvalp))get_symbol_addr("__pte_offset_map");
pte = local_pte_offset_map(pmd, vaddr, NULL);
if (pte_none(*pte))
goto failed;
#ifdef CONFIG_ARM64
paddr = (vaddr & (PAGE_SIZE - 1)) | __pte_to_phys(*pte);
#else
paddr = (vaddr & (PAGE_SIZE - 1)) | (pte_pfn(*pte) << PAGE_SHIFT);
#endif
pte_unmap(pte);
failed:
if (!paddr)
pr_err("find register failed\n");
return paddr;
}
static int get_pin_from_name(struct pinctrl_dev *pctldev, const char *name)
{
unsigned int i, pin;
for (i = 0; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
pin = pctldev->desc->pins[i].number;
desc = pin_desc_get(pctldev, pin);
/* Pin space may be sparse */
if (desc && !strcmp(name, desc->name))
return pin;
}
return -EINVAL;
}
static void *kalloc_wrap(const char *buf, size_t len)
{
char *tbuf;
tbuf = kzalloc(len, GFP_KERNEL);
if (!tbuf)
return ERR_PTR(-ENOMEM);
strncpy(tbuf, buf, len);
tbuf[len - 1] = '\0';
return tbuf;
}
static int split_param_and_find_pin(char *buf, char **gname, char **fname,
struct meson_pinctrl **pc, int *pin)
{
char *temp;
*gname = strstrip(buf);
if (**gname == '\0')
return -EINVAL;
for (*fname = *gname; !isspace(**fname); (*fname)++) {
if (**fname == '\0')
return -EINVAL;
}
/* first param + '\0' */
**fname = '\0';
/* skip third and more param */
for (temp = *fname + 1; !isspace(*temp); temp++) {
if (*temp == '\0')
break;
}
/* second param + '\0' */
*temp = '\0';
*fname = skip_spaces(*fname + 1);
if (**fname == '\0')
return -EINVAL;
string_upper(*gname, *gname);
/* search pcdev and match pin */
list_for_each_entry((*pc), &pc_list, node) {
*pin = get_pin_from_name((*pc)->pcdev, *gname);
if (*pin != -EINVAL)
break;
}
if (*pin == -EINVAL)
return *pin;
return 0;
}
static inline int debug_set_bias(struct meson_pinctrl *pc, int pin, char *func)
{
if (!strcmp(func, "bias-disable"))
meson_pinconf_disable_bias(pc, pin);
else if (!strcmp(func, "bias-up"))
meson_pinconf_enable_bias(pc, pin, true);
else if (!strcmp(func, "bias-down"))
meson_pinconf_enable_bias(pc, pin, false);
else
return -EINVAL;
return 0;
}
static inline int debug_set_gpio(struct meson_pinctrl *pc, int pin, char *func)
{
if (!strcmp(func, "input")) {
meson_pinconf_set_output(pc, pin, false);
} else if (!strcmp(func, "output-high")) {
meson_pinconf_set_drive(pc, pin, true);
meson_pinconf_set_output(pc, pin, true);
} else if (!strcmp(func, "output-low")) {
meson_pinconf_set_drive(pc, pin, false);
meson_pinconf_set_output(pc, pin, true);
} else {
return -EINVAL;
}
/* clear pinmux */
pc->data->pmx_ops->gpio_request_enable(pc->pcdev, NULL, pin);
return 0;
}
static ssize_t debug_store(const struct class *class,
const struct class_attribute *attr,
const char *buf, size_t len)
{
struct meson_pinctrl *pc = NULL;
char *gname = NULL;
char *tbuf = NULL;
char *func = NULL;
int ret = 0;
int pin = 0;
int ds = 0;
tbuf = kalloc_wrap(buf, len);
if (IS_ERR(tbuf))
return -ENOMEM;
ret = split_param_and_find_pin(tbuf, &gname, &func, &pc, &pin);
if (ret)
goto exit_free_buf;
ret = kstrtouint(func, 0, &ds);
if (!ret) {
ret = meson_pinconf_set_drive_strength(pc, pin, ds);
goto exit_free_buf;
}
if (!strncmp(func, "bias", 4)) {
ret = debug_set_bias(pc, pin, func);
goto exit_free_buf;
}
ret = debug_set_gpio(pc, pin, func);
exit_free_buf:
kfree(tbuf);
return ret ? ret : len;
}
static ssize_t show_reg_store(const struct class *class,
const struct class_attribute *attr,
const char *buf, size_t len)
{
char *tbuf;
int pin = 0;
unsigned int reg_ofs;
unsigned int bit;
unsigned int i;
unsigned int paddr;
void __iomem *reg;
struct meson_bank *bank;
struct meson_pmx_bank *mux_bank;
struct meson_pinctrl *pc = NULL;
struct regmap_mmio_context *ctx;
struct regmap_mmio_context *mux_ctx;
/* need to keep enum order */
const char *reg_list[NUM_REG] = {"pull_en", "pull", "dir", "out",
"in", "ds", "vthx" };
tbuf = kalloc_wrap(buf, len);
if (IS_ERR(tbuf))
return -ENOMEM;
tbuf = strstrip(tbuf);
string_upper(tbuf, tbuf);
/* search pcdev and match pin */
list_for_each_entry(pc, &pc_list, node) {
pin = get_pin_from_name(pc->pcdev, tbuf);
if (pin != -EINVAL)
break;
}
if (pin == -EINVAL)
goto exit_free_buf;
/* Skip if there is no mux register (usually used for TEST_N pin) */
if (!pc->reg_mux)
goto exit_free_buf;
mux_ctx = pc->reg_mux->bus_context;
if (meson_get_bank(pc, pin, &bank))
goto exit_free_buf;
if (meson_axg_pmx_get_bank(pc, pin, &mux_bank))
goto exit_free_buf;
ctx = pc->reg_gpio->bus_context;
meson_pmx_calc_reg_and_offset(mux_bank, pin, &reg_ofs, &bit);
reg = mux_ctx->regs + (reg_ofs << 2);
paddr = vaddr_to_paddr((unsigned long)reg);
if (!paddr)
goto exit_free_buf;
pr_info("Dump %s relative registers below:\n", tbuf);
pr_info("pinmux reg: 0x%x, bit: %d-%d curbit val: 0x%lx\n", paddr, bit,
bit + 3, (readl(reg) & GENMASK(bit + 3, bit)) >> bit);
for (i = REG_PULLEN; i < NUM_REG; i++) {
if (!strcmp(reg_list[i], "ds") && !pc->reg_ds)
continue;
if (!strcmp(reg_list[i], "vthx") && !pc->reg_vthx)
continue;
meson_calc_reg_and_bit(bank, pin, i, &reg_ofs, &bit);
reg = ctx->regs + reg_ofs;
paddr = vaddr_to_paddr((unsigned long)reg);
if (!paddr)
break;
if (!strcmp(reg_list[i], "ds"))
pr_info("%-7s reg: 0x%x, bit: %d-%d curbit val: 0x%lx\n",
reg_list[i], paddr, bit, bit + 1,
(readl(reg) & GENMASK(bit + 1, bit)) >> bit);
else
pr_info("%-7s reg: 0x%x, bit: %-5d curbit val: 0x%x\n",
reg_list[i], paddr, bit, !!(readl(reg) & BIT(bit)));
}
exit_free_buf:
kfree(tbuf);
return len;
}
static CLASS_ATTR_WO(debug);
static CLASS_ATTR_WO(show_reg);
static struct attribute *pinctrl_class_attrs[] = {
&class_attr_debug.attr,
&class_attr_show_reg.attr,
NULL,
};
ATTRIBUTE_GROUPS(pinctrl_class);
static struct class pinctrl_class = {
.name = "pinctrl",
.class_groups = pinctrl_class_groups,
};
static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
{
unsigned int i;
struct gpio_chip *gc = gdev->chip;
unsigned int gpio = gdev->base;
struct gpio_desc *gdesc = &gdev->descs[0];
bool is_out;
bool is_irq;
bool active_low;
for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
if (gdesc->name) {
seq_printf(s, " gpio-%-3d (%-20.20s)\n",
gpio, gdesc->name);
}
continue;
}
gpiod_get_direction(gdesc);
is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags);
seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s",
gpio, gdesc->name ? gdesc->name : "", gdesc->label->str,
is_out ? "out" : "in ",
gc->get ? (gc->get(gc, i) ? "hi" : "lo") : "? ",
is_irq ? "IRQ " : "",
active_low ? "ACTIVE LOW" : "");
seq_puts(s, "\n");
}
}
static int proc_gpio_show(struct seq_file *m, void *v)
{
struct meson_pinctrl *pc = NULL;
struct gpio_device *gdev;
struct gpio_chip *gc;
struct device *parent;
list_for_each_entry(pc, &pc_list, node) {
gc = &pc->chip;
if (!gc) {
seq_printf(m, "%s%s: (dangling chip)", "",
dev_name(&gdev->dev));
return 0;
}
gdev = gc->gpiodev;
seq_printf(m, "%s%s: GPIOs %d-%d", "",
dev_name(&gdev->dev),
gdev->base, gdev->base + gdev->ngpio - 1);
parent = gc->parent;
if (parent)
seq_printf(m, ", parent: %s/%s",
parent->bus ? parent->bus->name : "no-bus",
dev_name(parent));
if (gc->label)
seq_printf(m, ", %s", gc->label);
if (gc->can_sleep)
seq_puts(m, ", can sleep");
seq_puts(m, ":\n");
if (gc->dbg_show)
gc->dbg_show(m, gc);
else
gpiolib_dbg_show(m, gdev);
seq_puts(m, "\n");
}
return 0;
}
static void pinmux_dbg_show(struct seq_file *s, struct pinctrl_dev *pctldev)
{
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
unsigned int i, pin;
if (!pmxops)
return;
seq_puts(s, "Pinmux settings per pin\n");
if (pmxops->strict) {
seq_puts(s,
"Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
} else {
seq_puts(s,
"Format: pin (name): mux_owner gpio_owner hog?\n");
}
mutex_lock(&pctldev->mutex);
/* The pin number can be retrieved from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
bool is_hog = false;
pin = pctldev->desc->pins[i].number;
desc = pin_desc_get(pctldev, pin);
/* Skip if we cannot search the pin */
if (!desc)
continue;
if (desc->mux_owner &&
!strcmp(desc->mux_owner, pctldev->desc->name))
is_hog = true;
if (pmxops->strict) {
if (desc->mux_owner)
seq_printf(s, "pin %d (%s): device %s%s",
pin, desc->name, desc->mux_owner,
is_hog ? " (HOG)" : "");
else if (desc->gpio_owner)
seq_printf(s, "pin %d (%s): GPIO %s",
pin, desc->name, desc->gpio_owner);
else
seq_printf(s, "pin %d (%s): UNCLAIMED",
pin, desc->name);
} else {
/* For non-strict controllers */
seq_printf(s, "pin %d (%s): %s %s%s", pin, desc->name,
desc->mux_owner ? desc->mux_owner
: "(MUX UNCLAIMED)",
desc->gpio_owner ? desc->gpio_owner
: "(GPIO UNCLAIMED)",
is_hog ? " (HOG)" : "");
}
/* If mux: print function+group claiming the pin */
if (desc->mux_setting)
seq_printf(s, " function %s group %s\n",
pmxops->get_function_name(pctldev,
desc->mux_setting->func),
pctlops->get_group_name(pctldev,
desc->mux_setting->group));
else
seq_putc(s, '\n');
}
mutex_unlock(&pctldev->mutex);
}
static int proc_pinmux_show(struct seq_file *s, void *v)
{
struct meson_pinctrl *pc = NULL;
struct pinctrl_dev *pctldev;
list_for_each_entry(pc, &pc_list, node) {
pctldev = pc->pcdev;
pinmux_dbg_show(s, pctldev);
seq_putc(s, '\n');
}
return 0;
}
#endif
int meson_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct meson_pinctrl *pc;
int ret;
#if IS_ENABLED(CONFIG_AMLOGIC_GPIO_DEBUG)
struct proc_dir_entry *gpio_proc;
struct proc_dir_entry *pinmux_proc;
#endif
pc = devm_kzalloc(dev, sizeof(struct meson_pinctrl), GFP_KERNEL);
if (!pc)
return -ENOMEM;
pc->dev = dev;
pc->data = (struct meson_pinctrl_data *)of_device_get_match_data(dev);
ret = meson_pinctrl_parse_dt(pc, dev->of_node);
if (ret)
return ret;
#ifdef CONFIG_AMLOGIC_MODIFY
ret = meson_memory_duplicate(pdev, (void **)&pc->data->groups, pc->data->num_groups,
sizeof(struct meson_pmx_group));
if (ret)
return ret;
ret = meson_memory_duplicate(pdev, (void **)&pc->data->funcs, pc->data->num_funcs,
sizeof(struct meson_pmx_func));
if (ret)
return ret;
pc->desc.num_custom_params = ARRAY_SIZE(meson_extr_pinconf);
pc->desc.custom_params = meson_extr_pinconf;
#ifdef CONFIG_DEBUG_FS
pc->desc.custom_conf_items = meson_extr_conf_items;
#endif
#endif
pc->desc.name = "pinctrl-meson";
pc->desc.owner = THIS_MODULE;
pc->desc.pctlops = &meson_pctrl_ops;
pc->desc.pmxops = pc->data->pmx_ops;
pc->desc.confops = &meson_pinconf_ops;
pc->desc.pins = pc->data->pins;
pc->desc.npins = pc->data->num_pins;
pc->pcdev = devm_pinctrl_register(pc->dev, &pc->desc, pc);
if (IS_ERR(pc->pcdev)) {
dev_err(pc->dev, "can't register pinctrl device");
return PTR_ERR(pc->pcdev);
}
#if IS_ENABLED(CONFIG_AMLOGIC_GPIO_DEBUG)
mutex_lock(&list_lock);
/* make pinctrl/gpio debug only one node */
if (!class_is_registered(&pinctrl_class)) {
ret = class_register(&pinctrl_class);
if (ret) {
dev_err(pc->dev, "register pinctrl class failed\n");
} else {
gpio_proc = proc_create_single_data("gpio", 0400, NULL,
proc_gpio_show, NULL);
pinmux_proc = proc_create_single_data("pinmux-pins", 0400, NULL,
proc_pinmux_show, NULL);
if (!gpio_proc || !pinmux_proc)
pr_info("can't not create debug proc\n");
}
}
list_add_tail(&pc->node, &pc_list);
mutex_unlock(&list_lock);
#endif
return meson_gpiolib_register(pc);
}
EXPORT_SYMBOL(meson_pinctrl_probe);
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