linux-imx

/*

 * AXP20x pinctrl and GPIO driver

 *

 * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>

 * Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under  the terms of the GNU General  Public License as published by the

 * Free Software Foundation;  either version 2 of the License, or (at your

 * option) any later version.

 */

​

#include <linux/bitops.h>

#include <linux/device.h>

#include <linux/gpio/driver.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/mfd/axp20x.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/pinctrl/pinconf-generic.h>

#include <linux/pinctrl/pinctrl.h>

#include <linux/pinctrl/pinmux.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/slab.h>

​

#define AXP20X_GPIO_FUNCTIONS       0x7

#define AXP20X_GPIO_FUNCTION_OUT_LOW    0

#define AXP20X_GPIO_FUNCTION_OUT_HIGH   1

#define AXP20X_GPIO_FUNCTION_INPUT  2

​

#define AXP20X_FUNC_GPIO_OUT        0

#define AXP20X_FUNC_GPIO_IN     1

#define AXP20X_FUNC_LDO         2

#define AXP20X_FUNC_ADC         3

#define AXP20X_FUNCS_NB         4

​

#define AXP20X_MUX_GPIO_OUT     0

#define AXP20X_MUX_GPIO_IN      BIT(1)

#define AXP20X_MUX_ADC          BIT(2)

​

#define AXP813_MUX_ADC          (BIT(2) | BIT(0))

​

struct axp20x_pctrl_desc {

    const struct pinctrl_pin_desc   *pins;

    unsigned int            npins;

    /* Stores the pins supporting LDO function. Bit offset is pin number. */

    u8              ldo_mask;

    /* Stores the pins supporting ADC function. Bit offset is pin number. */

    u8              adc_mask;

    u8              gpio_status_offset;

    u8              adc_mux;

};

​

struct axp20x_pinctrl_function {

    const char  *name;

    unsigned int    muxval;

    const char  **groups;

    unsigned int    ngroups;

};

​

struct axp20x_pctl {

    struct gpio_chip    chip;

    struct regmap       *regmap;

    struct pinctrl_dev          *pctl_dev;

    struct device               *dev;

    const struct axp20x_pctrl_desc      *desc;

    struct axp20x_pinctrl_function      funcs[AXP20X_FUNCS_NB];

};

​

static const struct pinctrl_pin_desc axp209_pins[] = {

    PINCTRL_PIN(0, "GPIO0"),

    PINCTRL_PIN(1, "GPIO1"),

    PINCTRL_PIN(2, "GPIO2"),

};

​

static const struct pinctrl_pin_desc axp813_pins[] = {

    PINCTRL_PIN(0, "GPIO0"),

    PINCTRL_PIN(1, "GPIO1"),

};

​

static const struct axp20x_pctrl_desc axp20x_data = {

    .pins   = axp209_pins,

    .npins  = ARRAY_SIZE(axp209_pins),

    .ldo_mask = BIT(0) | BIT(1),

    .adc_mask = BIT(0) | BIT(1),

    .gpio_status_offset = 4,

    .adc_mux = AXP20X_MUX_ADC,

};