Mailing List Archive

From: Benjamin Bara <benjamin.bara@skidata.com>

The TPS658629-Q1 (unfortunately the only TPS6586x with public data sheet)
provides a SOFT RST bit in the SUPPLYENE reg to request a (cold) reboot.

Use it to implement and register a restart handler.

Tested on a TPS658640.

Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
---
drivers/mfd/tps6586x.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
index 4869155437cb..b46917231847 100644
--- a/drivers/mfd/tps6586x.c
+++ b/drivers/mfd/tps6586x.c
@@ -15,6 +15,7 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
+#include <linux/irqflags.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
@@ -30,6 +31,7 @@
#include <linux/mfd/tps6586x.h>

#define TPS6586X_SUPPLYENE 0x14
+#define SOFT_RST_BIT BIT(0)
#define EXITSLREQ_BIT BIT(1)
#define SLEEP_MODE_BIT BIT(3)

@@ -470,6 +472,20 @@ static int tps6586x_power_off_handler(struct sys_off_data *data)
return tps6586x_set_bits(tps6586x_dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
}

+static int tps6586x_restart_handler(struct sys_off_data *data)
+{
+ unsigned long flags;
+ struct device *tps6586x_dev = (struct device *)data->cb_data;
+
+ /* bring pmic into HARD REBOOT state, enforce atomic i2c xfer */
+ local_irq_save(flags);
+ tps6586x_set_bits(tps6586x_dev, TPS6586X_SUPPLYENE, SOFT_RST_BIT);
+ local_irq_restore(flags);
+
+ mdelay(500);
+ return 0;
+}
+
static void tps6586x_print_version(struct i2c_client *client, int version)
{
const char *name;
@@ -570,6 +586,13 @@ static int tps6586x_i2c_probe(struct i2c_client *client)
dev_err(&client->dev, "register power off handler failed: %d\n", ret);
goto err_add_devs;
}
+
+ ret = devm_register_restart_handler(&client->dev, &tps6586x_restart_handler,
+ &client->dev);
+ if (ret) {
+ dev_err(&client->dev, "register restart handler failed: %d\n", ret);
+ goto err_add_devs;
+ }
}

return 0;
--
2.34.1