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Commit a370f60a authored by Stefan Agner's avatar Stefan Agner Committed by Lee Jones
Browse files

mfd: rn5t618: Register restart handler 



Use the PMIC's repower capability for reboots. Register a restart
handler and use a slightly elevated priority of 192 since the PMIC
has suprior reset capability (causing a system wide reset).

Signed-off-by: default avatarStefan Agner <stefan@agner.ch>
Reviewed-by: default avatarMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent fd65ae4c

drivers/mfd/rn5t618.c

+37 −6
Original line number Diff line number Diff line
@@ -12,11 +12,13 @@ 
 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/delay.h>

#include <linux/i2c.h>

#include <linux/mfd/core.h>

#include <linux/mfd/rn5t618.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/reboot.h>

#include <linux/regmap.h>



static const struct mfd_cell rn5t618_cells[] = {
@@ -50,17 +52,38 @@ static const struct regmap_config rn5t618_regmap_config = { 
};



static struct rn5t618 *rn5t618_pm_power_off;

static struct notifier_block rn5t618_restart_handler;



static void rn5t618_power_off(void)

static void rn5t618_trigger_poweroff_sequence(bool repower)

{

	/* disable automatic repower-on */

	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,

			   RN5T618_REPCNT_REPWRON, 0);

			   RN5T618_REPCNT_REPWRON,

			   repower ? RN5T618_REPCNT_REPWRON : 0);

	/* start power-off sequence */

	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,

			   RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);

}



static void rn5t618_power_off(void)

{

	rn5t618_trigger_poweroff_sequence(false);

}



static int rn5t618_restart(struct notifier_block *this,

			    unsigned long mode, void *cmd)

{

	rn5t618_trigger_poweroff_sequence(true);



	/*

	 * Re-power factor detection on PMIC side is not instant. 1ms

	 * proved to be enough time until reset takes effect.

	 */

	mdelay(1);



	return NOTIFY_DONE;

}



static const struct of_device_id rn5t618_of_match[] = {

	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },

	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
@@ -102,13 +125,21 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c, 
		return ret;

	}



	if (of_device_is_system_power_controller(i2c->dev.of_node)) {

		if (!pm_power_off) {

	rn5t618_pm_power_off = priv;

	if (of_device_is_system_power_controller(i2c->dev.of_node)) {

		if (!pm_power_off)

			pm_power_off = rn5t618_power_off;

		} else {

		else

			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");

	}



	rn5t618_restart_handler.notifier_call = rn5t618_restart;

	rn5t618_restart_handler.priority = 192;



	ret = register_restart_handler(&rn5t618_restart_handler);

	if (ret) {

		dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);

		return ret;

	}



	return 0;