Commit c31f625d authored by Matti Vaittinen's avatar Matti Vaittinen Committed by Lee Jones

gpio: bd71828: Initial support for ROHM BD71828 PMIC GPIOs

ROHM BD71828 PMIC contains 4 pins which can be configured by OTP
to be used for general purposes. First 3 can be used as outputs
and 4.th pin can be used as input. Allow them to be controlled
via GPIO framework.

The driver assumes all of the pins are configured as GPIOs and
trusts that the reserved pins in other OTP configurations are
excluded from control using "gpio-reserved-ranges" device tree
property (or left untouched by GPIO users).

Typical use for 4.th pin (input) is to use it as HALL sensor
input so that this pin state is toggled when HALL sensor detects
LID position change (from close to open or open to close). PMIC
HW implements some extra logic which allows PMIC to power-up the
system when this pin is toggled. Please see the data sheet for
details of GPIO options which can be selected by OTP settings.
Signed-off-by: default avatarMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent fe5a591b
......@@ -1021,6 +1021,18 @@ config GPIO_BD70528
This driver can also be built as a module. If so, the module
will be called gpio-bd70528.
config GPIO_BD71828
tristate "ROHM BD71828 GPIO support"
depends on MFD_ROHM_BD71828
help
Support for GPIOs on ROHM BD71828 PMIC. There are three GPIOs
available on the ROHM PMIC in total. The GPIOs are limited to
outputs only and pins must be configured to GPIO outputs by
OTP. Enable this only if you want to use these pins as outputs.
This driver can also be built as a module. If so, the module
will be called gpio-bd71828.
config GPIO_BD9571MWV
tristate "ROHM BD9571 GPIO support"
depends on MFD_BD9571MWV
......
......@@ -37,6 +37,7 @@ obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o
obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
obj-$(CONFIG_GPIO_BCM_XGS_IPROC) += gpio-xgs-iproc.o
obj-$(CONFIG_GPIO_BD70528) += gpio-bd70528.o
obj-$(CONFIG_GPIO_BD71828) += gpio-bd71828.o
obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o
obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
......
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2018 ROHM Semiconductors
#include <linux/gpio/driver.h>
#include <linux/mfd/rohm-bd71828.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define GPIO_OUT_REG(off) (BD71828_REG_GPIO_CTRL1 + (off))
#define HALL_GPIO_OFFSET 3
/*
* These defines can be removed when
* "gpio: Add definition for GPIO direction"
* (9208b1e77d6e8e9776f34f46ef4079ecac9c3c25 in GPIO tree) gets merged,
*/
#ifndef GPIO_LINE_DIRECTION_IN
#define GPIO_LINE_DIRECTION_IN 1
#define GPIO_LINE_DIRECTION_OUT 0
#endif
struct bd71828_gpio {
struct rohm_regmap_dev chip;
struct gpio_chip gpio;
};
static void bd71828_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
int ret;
struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
u8 val = (value) ? BD71828_GPIO_OUT_HI : BD71828_GPIO_OUT_LO;
/*
* The HALL input pin can only be used as input. If this is the pin
* we are dealing with - then we are done
*/
if (offset == HALL_GPIO_OFFSET)
return;
ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
BD71828_GPIO_OUT_MASK, val);
if (ret)
dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
}
static int bd71828_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
int ret;
unsigned int val;
struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
if (offset == HALL_GPIO_OFFSET)
ret = regmap_read(bdgpio->chip.regmap, BD71828_REG_IO_STAT,
&val);
else
ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
&val);
if (!ret)
ret = (val & BD71828_GPIO_OUT_MASK);
return ret;
}
static int bd71828_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
unsigned long config)
{
struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
if (offset == HALL_GPIO_OFFSET)
return -ENOTSUPP;
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
return regmap_update_bits(bdgpio->chip.regmap,
GPIO_OUT_REG(offset),
BD71828_GPIO_DRIVE_MASK,
BD71828_GPIO_OPEN_DRAIN);
case PIN_CONFIG_DRIVE_PUSH_PULL:
return regmap_update_bits(bdgpio->chip.regmap,
GPIO_OUT_REG(offset),
BD71828_GPIO_DRIVE_MASK,
BD71828_GPIO_PUSH_PULL);
default:
break;
}
return -ENOTSUPP;
}
static int bd71828_get_direction(struct gpio_chip *chip, unsigned int offset)
{
/*
* Pin usage is selected by OTP data. We can't read it runtime. Hence
* we trust that if the pin is not excluded by "gpio-reserved-ranges"
* the OTP configuration is set to OUT. (Other pins but HALL input pin
* on BD71828 can't really be used for general purpose input - input
* states are used for specific cases like regulator control or
* PMIC_ON_REQ.
*/
if (offset == HALL_GPIO_OFFSET)
return GPIO_LINE_DIRECTION_IN;
return GPIO_LINE_DIRECTION_OUT;
}
static int bd71828_probe(struct platform_device *pdev)
{
struct bd71828_gpio *bdgpio;
struct rohm_regmap_dev *bd71828;
bd71828 = dev_get_drvdata(pdev->dev.parent);
if (!bd71828) {
dev_err(&pdev->dev, "No MFD driver data\n");
return -EINVAL;
}
bdgpio = devm_kzalloc(&pdev->dev, sizeof(*bdgpio),
GFP_KERNEL);
if (!bdgpio)
return -ENOMEM;
bdgpio->chip.dev = &pdev->dev;
bdgpio->gpio.parent = pdev->dev.parent;
bdgpio->gpio.label = "bd71828-gpio";
bdgpio->gpio.owner = THIS_MODULE;
bdgpio->gpio.get_direction = bd71828_get_direction;
bdgpio->gpio.set_config = bd71828_gpio_set_config;
bdgpio->gpio.can_sleep = true;
bdgpio->gpio.get = bd71828_gpio_get;
bdgpio->gpio.set = bd71828_gpio_set;
bdgpio->gpio.base = -1;
/*
* See if we need some implementation to mark some PINs as
* not controllable based on DT info or if core can handle
* "gpio-reserved-ranges" and exclude them from control
*/
bdgpio->gpio.ngpio = 4;
bdgpio->gpio.of_node = pdev->dev.parent->of_node;
bdgpio->chip.regmap = bd71828->regmap;
return devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
bdgpio);
}
static struct platform_driver bd71828_gpio = {
.driver = {
.name = "bd71828-gpio"
},
.probe = bd71828_probe,
};
module_platform_driver(bd71828_gpio);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("BD71828 voltage regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:bd71828-gpio");
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment