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power: reset: Add TPS65086 restart driver

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Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
This commit is contained in:
Emil Renner Berthing 2021-05-03 12:20:05 +02:00
parent 560bb032fe
commit 66a1c63c40
4 changed files with 109 additions and 0 deletions
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1
drivers/mfd/tps65086.c
View file

@ -24,6 +24,7 @@
static const struct mfd_cell tps65086_cells[] = {
{ .name = "tps65086-regulator", },
{ .name = "tps65086-gpio", },
{ .name = "tps65086-restart", },
};
static const struct regmap_range tps65086_yes_ranges[] = {

6
drivers/power/reset/Kconfig
View file

@ -204,6 +204,12 @@ config POWER_RESET_ST
help
Reset support for STMicroelectronics boards.
config POWER_RESET_TPS65086
bool "TPS65086 restart driver"
depends on MFD_TPS65086
help
Reset TPS65086 PMIC on restart.
config POWER_RESET_VERSATILE
bool "ARM Versatile family reboot driver"
depends on ARM

1
drivers/power/reset/Makefile
View file

@ -23,6 +23,7 @@ obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o
obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o
obj-$(CONFIG_POWER_RESET_TPS65086) += tps65086-restart.o
obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o
obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o
obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o

101
drivers/power/reset/tps65086-restart.c Normal file
View file

@ -0,0 +1,101 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Emil Renner Berthing
*/
#include <linux/reboot.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65086.h>
struct tps65086_restart {
struct notifier_block handler;
struct tps65086 *tps;
struct device *dev;
};
static int tps65086_restart_notify(struct notifier_block *this,
unsigned long mode, void *cmd)
{
struct tps65086_restart *tps65086_restart =
container_of(this, struct tps65086_restart, handler);
int ret;
ret = regmap_write(tps65086_restart->tps->regmap, TPS65086_FORCESHUTDN, 1);
if (ret) {
dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n",
__func__, ret);
return NOTIFY_DONE;
}
/* give it a little time */
mdelay(200);
WARN_ON(1);
return NOTIFY_DONE;
}
static int tps65086_restart_probe(struct platform_device *pdev)
{
struct tps65086_restart *tps65086_restart;
int ret;
tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL);
if (!tps65086_restart)
return -ENOMEM;
platform_set_drvdata(pdev, tps65086_restart);
tps65086_restart->handler.notifier_call = tps65086_restart_notify;
tps65086_restart->handler.priority = 192;
tps65086_restart->tps = dev_get_drvdata(pdev->dev.parent);
tps65086_restart->dev = &pdev->dev;
ret = register_restart_handler(&tps65086_restart->handler);
if (ret) {
dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n",
__func__, ret);
return -ENODEV;
}
return 0;
}
static int tps65086_restart_remove(struct platform_device *pdev)
{
struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev);
int ret;
ret = unregister_restart_handler(&tps65086_restart->handler);
if (ret) {
dev_err(&pdev->dev,
"%s: cannot unregister restart handler: %d\n",
__func__, ret);
return -ENODEV;
}
return 0;
}
static const struct platform_device_id tps65086_restart_id_table[] = {
{ "tps65086-restart", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table);
static struct platform_driver tps65086_restart_driver = {
.driver = {
.name = "tps65086-restart",
},
.probe = tps65086_restart_probe,
.remove = tps65086_restart_remove,
.id_table = tps65086_restart_id_table,
};
module_platform_driver(tps65086_restart_driver);
MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
MODULE_DESCRIPTION("TPS65086 restart driver");
MODULE_LICENSE("GPL v2");