mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-20 19:23:57 +08:00
80698507e0
The only way to reset the BeagleV Starlight v0.9 board[1] properly is to tell the PMIC to reset itself which will then assert the external reset lines of the SoC, USB hub and ethernet phy. This adds a driver to register a reset handler to do just that. [1] https://github.com/beagleboard/beaglev-starlight Signed-off-by: Emil Renner Berthing <kernel@esmil.dk> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2021 Emil Renner Berthing
|
|
*/
|
|
|
|
#include <linux/mfd/tps65086.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reboot.h>
|
|
|
|
struct tps65086_restart {
|
|
struct notifier_block handler;
|
|
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);
|
|
struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent);
|
|
int ret;
|
|
|
|
ret = regmap_write(tps65086->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->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-reset", },
|
|
{ /* 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");
|