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gpio: add tps65218 gpio 

Driver for the GPIO block found in ti's tps65218 pmics.

The device has two GPIOs and one GPO pin which can be configured as follows:
GPIO1:
	-general-purpose, open-drain output controlled by GPO1 user bit and/or
	 sequencer
	-DDR3 reset input signal from SOC. Signal is either latched or
	 passed-trough to GPO2 pin. See below for details.
GPO2:
	-general-purpose output controlled by GPO2 user bit
	-DDR3 reset output signal. Signal is controlled by GPIO1 and PGOOD.
	 See below for details.
	-Output buffer can be configured as open-drain or push-pull.
GPIO3:
	-general-purpose, open-drain output controlled by GPO3 user bit and/or
	 sequencer
	-reset input-signal for DCDC1 and DCDC2.

The input configurations are not meant to be used by the user so the driver
only offers GPOs.

v2: Added request routine that evaluates the fw config flags and removed module
    owner
v3: Added .direction_input() routine, and took care of all Linus Walleij
suggestions (clamp to bool, use proper include)

Signed-off-by: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Nicolas Saenz Julienne 2016-01-30 17:06:44 +00:00 committed by Linus Walleij
parent b866526d0c
commit c366c76a2c
3 changed files with 231 additions and 0 deletions
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7
drivers/gpio/Kconfig
View File

@ -889,6 +889,13 @@ config GPIO_TIMBERDALE
---help---
Add support for the GPIO IP in the timberdale FPGA.
config GPIO_TPS65218
tristate "TPS65218 GPIO"
depends on MFD_TPS65218
help
Select this option to enable GPIO driver for the TPS65218
chip family.
config GPIO_TPS6586X
bool "TPS6586X GPIO"
depends on MFD_TPS6586X

1
drivers/gpio/Makefile
View File

@ -98,6 +98,7 @@ obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o

223
drivers/gpio/gpio-tps65218.c Normal file
View File

@ -0,0 +1,223 @@
/*
* Copyright 2015 Verifone Int.
*
* Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
*
* This program is free software; you can redistribute it and/or modify i t
* under the terms of the GNU General Public License as published by th e
* Free Software Foundation; either version 2 of the License, or (at you r
* option) any later version.
*
* This driver is based on the gpio-tps65912 implementation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65218.h>
#include "gpiolib.h"
struct tps65218_gpio {
struct tps65218 *tps65218;
struct gpio_chip gpio_chip;
};
static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
unsigned int val;
int ret;
ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
if (ret)
return ret;
return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
}
static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
int value)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
if (value)
tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
TPS65218_ENABLE2_GPIO1 << offset,
TPS65218_ENABLE2_GPIO1 << offset,
TPS65218_PROTECT_L1);
else
tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
TPS65218_ENABLE2_GPIO1 << offset,
TPS65218_PROTECT_L1);
}
static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
int value)
{
/* Only drives GPOs */
return 0;
}
static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
{
return -EPERM;
}
static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
{
struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
struct tps65218 *tps65218 = tps65218_gpio->tps65218;
unsigned long flags = gc->desc[offset].flags;
int ret;
if (flags & FLAG_OPEN_SOURCE) {
dev_err(gc->parent, "can't work as open source\n");
return -EINVAL;
}
switch (offset) {
case 0:
if (!(flags & FLAG_OPEN_DRAIN)) {
dev_err(gc->parent, "GPO1 works only as open drain\n");
return -EINVAL;
}
/* Disable sequencer for GPO1 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
TPS65218_SEQ7_GPO1_SEQ_MASK,
TPS65218_PROTECT_L1);
if (ret)
return ret;
/* Setup GPO1 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_IO1_SEL,
TPS65218_PROTECT_L1);
if (ret)
return ret;
break;
case 1:
/* GP02 is push-pull by default, can be set as open drain. */
if (flags & FLAG_OPEN_DRAIN) {
ret = tps65218_clear_bits(tps65218,
TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_GPO2_BUF,
TPS65218_PROTECT_L1);
if (ret)
return ret;
}
/* Setup GPO2 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_IO1_SEL,
TPS65218_PROTECT_L1);
if (ret)
return ret;
break;
case 2:
if (!(flags & FLAG_OPEN_DRAIN)) {
dev_err(gc->parent, "GPO3 works only as open drain\n");
return -EINVAL;
}
/* Disable sequencer for GPO3 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
TPS65218_SEQ7_GPO3_SEQ_MASK,
TPS65218_PROTECT_L1);
if (ret)
return ret;
/* Setup GPO3 */
ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
TPS65218_CONFIG2_DC12_RST,
TPS65218_PROTECT_L1);
if (ret)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static struct gpio_chip template_chip = {
.label = "gpio-tps65218",
.owner = THIS_MODULE,
.request = tps65218_gpio_request,
.direction_output = tps65218_gpio_output,
.direction_input = tps65218_gpio_input,
.get = tps65218_gpio_get,
.set = tps65218_gpio_set,
.can_sleep = true,
.ngpio = 3,
.base = -1,
};
static int tps65218_gpio_probe(struct platform_device *pdev)
{
struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
struct tps65218_gpio *tps65218_gpio;
int ret;
tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
GFP_KERNEL);
if (!tps65218_gpio)
return -ENOMEM;
tps65218_gpio->tps65218 = tps65218;
tps65218_gpio->gpio_chip = template_chip;
tps65218_gpio->gpio_chip.parent = &pdev->dev;
#ifdef CONFIG_OF_GPIO
tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
#endif
ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, tps65218_gpio);
return ret;
}
static int tps65218_gpio_remove(struct platform_device *pdev)
{
struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
gpiochip_remove(&tps65218_gpio->gpio_chip);
return 0;
}
static const struct of_device_id tps65218_dt_match[] = {
{ .compatible = "ti,tps65218-gpio" },
{ }
};
MODULE_DEVICE_TABLE(of, tps65218_dt_match);
static struct platform_driver tps65218_gpio_driver = {
.driver = {
.name = "tps65218-gpio",
.of_match_table = of_match_ptr(tps65218_dt_match)
},
.probe = tps65218_gpio_probe,
.remove = tps65218_gpio_remove,
};
module_platform_driver(tps65218_gpio_driver);
MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65218-gpio");