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linux/drivers/pinctrl/pinctrl-tps6594.c
Esteban Blanc 901b277eaf pinctrl: tps6594: Add driver for TPS6594 pinctrl and GPIOs 
TI TPS6594 PMIC has 11 GPIOs which can be used
for different functions.

This patch adds a pinctrl and GPIO drivers in
order to use those functions.

Signed-off-by: Esteban Blanc <eblanc@baylibre.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20231108104124.2818275-1-eblanc@baylibre.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2023-11-14 14:45:35 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Pinmux and GPIO driver for tps6594 PMIC
*
* Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
*/
#include <linux/gpio/driver.h>
#include <linux/gpio/regmap.h>
#include <linux/module.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/mfd/tps6594.h>
#define TPS6594_PINCTRL_PINS_NB 11
#define TPS6594_PINCTRL_GPIO_FUNCTION 0
#define TPS6594_PINCTRL_SCL_I2C2_CS_SPI_FUNCTION 1
#define TPS6594_PINCTRL_TRIG_WDOG_FUNCTION 1
#define TPS6594_PINCTRL_CLK32KOUT_FUNCTION 1
#define TPS6594_PINCTRL_SCLK_SPMI_FUNCTION 1
#define TPS6594_PINCTRL_SDATA_SPMI_FUNCTION 1
#define TPS6594_PINCTRL_NERR_MCU_FUNCTION 1
#define TPS6594_PINCTRL_PDOG_FUNCTION 1
#define TPS6594_PINCTRL_SYNCCLKIN_FUNCTION 1
#define TPS6594_PINCTRL_NRSTOUT_SOC_FUNCTION 2
#define TPS6594_PINCTRL_SYNCCLKOUT_FUNCTION 2
#define TPS6594_PINCTRL_SDA_I2C2_SDO_SPI_FUNCTION 2
#define TPS6594_PINCTRL_NERR_SOC_FUNCTION 2
#define TPS6594_PINCTRL_DISABLE_WDOG_FUNCTION 3
#define TPS6594_PINCTRL_NSLEEP1_FUNCTION 4
#define TPS6594_PINCTRL_NSLEEP2_FUNCTION 5
#define TPS6594_PINCTRL_WKUP1_FUNCTION 6
#define TPS6594_PINCTRL_WKUP2_FUNCTION 7
/* Special muxval for recalcitrant pins */
#define TPS6594_PINCTRL_DISABLE_WDOG_FUNCTION_GPIO8 2
#define TPS6594_PINCTRL_SYNCCLKOUT_FUNCTION_GPIO8 3
#define TPS6594_PINCTRL_CLK32KOUT_FUNCTION_GPIO9 3
#define TPS6594_OFFSET_GPIO_SEL 5
#define FUNCTION(fname, v) \
{ \
.pinfunction = PINCTRL_PINFUNCTION(#fname, \
tps6594_##fname##_func_group_names, \
ARRAY_SIZE(tps6594_##fname##_func_group_names)),\
.muxval = v, \
}
static const struct pinctrl_pin_desc tps6594_pins[TPS6594_PINCTRL_PINS_NB] = {
PINCTRL_PIN(0, "GPIO0"), PINCTRL_PIN(1, "GPIO1"),
PINCTRL_PIN(2, "GPIO2"), PINCTRL_PIN(3, "GPIO3"),
PINCTRL_PIN(4, "GPIO4"), PINCTRL_PIN(5, "GPIO5"),
PINCTRL_PIN(6, "GPIO6"), PINCTRL_PIN(7, "GPIO7"),
PINCTRL_PIN(8, "GPIO8"), PINCTRL_PIN(9, "GPIO9"),
PINCTRL_PIN(10, "GPIO10"),
};
static const char *const tps6594_gpio_func_group_names[] = {
"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5",
"GPIO6", "GPIO7", "GPIO8", "GPIO9", "GPIO10",
};
static const char *const tps6594_nsleep1_func_group_names[] = {
"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5",
"GPIO6", "GPIO7", "GPIO8", "GPIO9", "GPIO10",
};
static const char *const tps6594_nsleep2_func_group_names[] = {
"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5",
"GPIO6", "GPIO7", "GPIO8", "GPIO9", "GPIO10",
};
static const char *const tps6594_wkup1_func_group_names[] = {
"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5",
"GPIO6", "GPIO7", "GPIO8", "GPIO9", "GPIO10",
};
static const char *const tps6594_wkup2_func_group_names[] = {
"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5",
"GPIO6", "GPIO7", "GPIO8", "GPIO9", "GPIO10",
};
static const char *const tps6594_scl_i2c2_cs_spi_func_group_names[] = {
"GPIO0",
"GPIO1",
};
static const char *const tps6594_nrstout_soc_func_group_names[] = {
"GPIO0",
"GPIO10",
};
static const char *const tps6594_trig_wdog_func_group_names[] = {
"GPIO1",
"GPIO10",
};
static const char *const tps6594_sda_i2c2_sdo_spi_func_group_names[] = {
"GPIO1",
};
static const char *const tps6594_clk32kout_func_group_names[] = {
"GPIO2",
"GPIO3",
"GPIO7",
};
static const char *const tps6594_nerr_soc_func_group_names[] = {
"GPIO2",
};
static const char *const tps6594_sclk_spmi_func_group_names[] = {
"GPIO4",
};
static const char *const tps6594_sdata_spmi_func_group_names[] = {
"GPIO5",
};
static const char *const tps6594_nerr_mcu_func_group_names[] = {
"GPIO6",
};
static const char *const tps6594_syncclkout_func_group_names[] = {
"GPIO7",
"GPIO9",
};
static const char *const tps6594_disable_wdog_func_group_names[] = {
"GPIO7",
"GPIO8",
};
static const char *const tps6594_pdog_func_group_names[] = {
"GPIO8",
};
static const char *const tps6594_syncclkin_func_group_names[] = {
"GPIO9",
};
struct tps6594_pinctrl_function {
struct pinfunction pinfunction;
u8 muxval;
};
static const struct tps6594_pinctrl_function pinctrl_functions[] = {
FUNCTION(gpio, TPS6594_PINCTRL_GPIO_FUNCTION),
FUNCTION(nsleep1, TPS6594_PINCTRL_NSLEEP1_FUNCTION),
FUNCTION(nsleep2, TPS6594_PINCTRL_NSLEEP2_FUNCTION),
FUNCTION(wkup1, TPS6594_PINCTRL_WKUP1_FUNCTION),
FUNCTION(wkup2, TPS6594_PINCTRL_WKUP2_FUNCTION),
FUNCTION(scl_i2c2_cs_spi, TPS6594_PINCTRL_SCL_I2C2_CS_SPI_FUNCTION),
FUNCTION(nrstout_soc, TPS6594_PINCTRL_NRSTOUT_SOC_FUNCTION),
FUNCTION(trig_wdog, TPS6594_PINCTRL_TRIG_WDOG_FUNCTION),
FUNCTION(sda_i2c2_sdo_spi, TPS6594_PINCTRL_SDA_I2C2_SDO_SPI_FUNCTION),
FUNCTION(clk32kout, TPS6594_PINCTRL_CLK32KOUT_FUNCTION),
FUNCTION(nerr_soc, TPS6594_PINCTRL_NERR_SOC_FUNCTION),
FUNCTION(sclk_spmi, TPS6594_PINCTRL_SCLK_SPMI_FUNCTION),
FUNCTION(sdata_spmi, TPS6594_PINCTRL_SDATA_SPMI_FUNCTION),
FUNCTION(nerr_mcu, TPS6594_PINCTRL_NERR_MCU_FUNCTION),
FUNCTION(syncclkout, TPS6594_PINCTRL_SYNCCLKOUT_FUNCTION),
FUNCTION(disable_wdog, TPS6594_PINCTRL_DISABLE_WDOG_FUNCTION),
FUNCTION(pdog, TPS6594_PINCTRL_PDOG_FUNCTION),
FUNCTION(syncclkin, TPS6594_PINCTRL_SYNCCLKIN_FUNCTION),
};
struct tps6594_pinctrl {
struct tps6594 *tps;
struct gpio_regmap *gpio_regmap;
struct pinctrl_dev *pctl_dev;
const struct tps6594_pinctrl_function *funcs;
const struct pinctrl_pin_desc *pins;
};
static int tps6594_gpio_regmap_xlate(struct gpio_regmap *gpio,
unsigned int base, unsigned int offset,
unsigned int *reg, unsigned int *mask)
{
unsigned int line = offset % 8;
unsigned int stride = offset / 8;
switch (base) {
case TPS6594_REG_GPIOX_CONF(0):
*reg = TPS6594_REG_GPIOX_CONF(offset);
*mask = TPS6594_BIT_GPIO_DIR;
return 0;
case TPS6594_REG_GPIO_IN_1:
case TPS6594_REG_GPIO_OUT_1:
*reg = base + stride;
*mask = BIT(line);
return 0;
default:
return -EINVAL;
}
}
static int tps6594_pmx_func_cnt(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(pinctrl_functions);
}
static const char *tps6594_pmx_func_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct tps6594_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctldev);
return pinctrl->funcs[selector].pinfunction.name;
}
static int tps6594_pmx_func_groups(struct pinctrl_dev *pctldev,
unsigned int selector,
const char *const **groups,
unsigned int *num_groups)
{
struct tps6594_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctldev);
*groups = pinctrl->funcs[selector].pinfunction.groups;
*num_groups = pinctrl->funcs[selector].pinfunction.ngroups;
return 0;
}
static int tps6594_pmx_set(struct tps6594_pinctrl *pinctrl, unsigned int pin,
u8 muxval)
{
u8 mux_sel_val = muxval << TPS6594_OFFSET_GPIO_SEL;
return regmap_update_bits(pinctrl->tps->regmap,
TPS6594_REG_GPIOX_CONF(pin),
TPS6594_MASK_GPIO_SEL, mux_sel_val);
}
static int tps6594_pmx_set_mux(struct pinctrl_dev *pctldev,
unsigned int function, unsigned int group)
{
struct tps6594_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctldev);
u8 muxval = pinctrl->funcs[function].muxval;
/* Some pins don't have the same muxval for the same function... */
if (group == 8) {
if (muxval == TPS6594_PINCTRL_DISABLE_WDOG_FUNCTION)
muxval = TPS6594_PINCTRL_DISABLE_WDOG_FUNCTION_GPIO8;
else if (muxval == TPS6594_PINCTRL_SYNCCLKOUT_FUNCTION)
muxval = TPS6594_PINCTRL_SYNCCLKOUT_FUNCTION_GPIO8;
} else if (group == 9) {
if (muxval == TPS6594_PINCTRL_CLK32KOUT_FUNCTION)
muxval = TPS6594_PINCTRL_CLK32KOUT_FUNCTION_GPIO9;
}
return tps6594_pmx_set(pinctrl, group, muxval);
}
static int tps6594_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int offset, bool input)
{
struct tps6594_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctldev);
u8 muxval = pinctrl->funcs[TPS6594_PINCTRL_GPIO_FUNCTION].muxval;
return tps6594_pmx_set(pinctrl, offset, muxval);
}
static const struct pinmux_ops tps6594_pmx_ops = {
.get_functions_count = tps6594_pmx_func_cnt,
.get_function_name = tps6594_pmx_func_name,
.get_function_groups = tps6594_pmx_func_groups,
.set_mux = tps6594_pmx_set_mux,
.gpio_set_direction = tps6594_pmx_gpio_set_direction,
.strict = true,
};
static int tps6594_groups_cnt(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(tps6594_pins);
}
static int tps6594_group_pins(struct pinctrl_dev *pctldev,
unsigned int selector, const unsigned int **pins,
unsigned int *num_pins)
{
struct tps6594_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctldev);
*pins = &pinctrl->pins[selector].number;
*num_pins = 1;
return 0;
}
static const char *tps6594_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct tps6594_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctldev);
return pinctrl->pins[selector].name;
}
static const struct pinctrl_ops tps6594_pctrl_ops = {
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
.dt_free_map = pinconf_generic_dt_free_map,
.get_groups_count = tps6594_groups_cnt,
.get_group_name = tps6594_group_name,
.get_group_pins = tps6594_group_pins,
};
static int tps6594_pinctrl_probe(struct platform_device *pdev)
{
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct tps6594_pinctrl *pinctrl;
struct pinctrl_desc *pctrl_desc;
struct gpio_regmap_config config = {};
pctrl_desc = devm_kzalloc(dev, sizeof(*pctrl_desc), GFP_KERNEL);
if (!pctrl_desc)
return -ENOMEM;
pctrl_desc->name = dev_name(dev);
pctrl_desc->owner = THIS_MODULE;
pctrl_desc->pins = tps6594_pins;
pctrl_desc->npins = ARRAY_SIZE(tps6594_pins);
pctrl_desc->pctlops = &tps6594_pctrl_ops;
pctrl_desc->pmxops = &tps6594_pmx_ops;
pinctrl = devm_kzalloc(dev, sizeof(*pinctrl), GFP_KERNEL);
if (!pinctrl)
return -ENOMEM;
pinctrl->tps = dev_get_drvdata(dev->parent);
pinctrl->funcs = pinctrl_functions;
pinctrl->pins = tps6594_pins;
pinctrl->pctl_dev = devm_pinctrl_register(dev, pctrl_desc, pinctrl);
if (IS_ERR(pinctrl->pctl_dev))
return dev_err_probe(dev, PTR_ERR(pinctrl->pctl_dev),
"Couldn't register pinctrl driver\n");
config.parent = tps->dev;
config.regmap = tps->regmap;
config.ngpio = TPS6594_PINCTRL_PINS_NB;
config.ngpio_per_reg = 8;
config.reg_dat_base = TPS6594_REG_GPIO_IN_1;
config.reg_set_base = TPS6594_REG_GPIO_OUT_1;
config.reg_dir_out_base = TPS6594_REG_GPIOX_CONF(0);
config.reg_mask_xlate = tps6594_gpio_regmap_xlate;
pinctrl->gpio_regmap = devm_gpio_regmap_register(dev, &config);
if (IS_ERR(pinctrl->gpio_regmap))
return dev_err_probe(dev, PTR_ERR(pinctrl->gpio_regmap),
"Couldn't register gpio_regmap driver\n");
return 0;
}
static const struct platform_device_id tps6594_pinctrl_id_table[] = {
{ "tps6594-pinctrl", },
{}
};
MODULE_DEVICE_TABLE(platform, tps6594_pinctrl_id_table);
static struct platform_driver tps6594_pinctrl_driver = {
.probe = tps6594_pinctrl_probe,
.driver = {
.name = "tps6594-pinctrl",
},
.id_table = tps6594_pinctrl_id_table,
};
module_platform_driver(tps6594_pinctrl_driver);
MODULE_AUTHOR("Esteban Blanc <eblanc@baylibre.com>");
MODULE_DESCRIPTION("TPS6594 pinctrl and GPIO driver");
MODULE_LICENSE("GPL");
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