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mfd: rn5t618: Register restart handler

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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: Stefan Agner <stefan@agner.ch>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Stefan Agner 2016-06-28 22:53:22 -07:00 committed by Lee Jones
parent fd65ae4cb6
commit a370f60a58
1 changed files with 37 additions and 6 deletions
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43
drivers/mfd/rn5t618.c
View file

@ -12,11 +12,13 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>. * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
#include <linux/delay.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/mfd/core.h> #include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h> #include <linux/mfd/rn5t618.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/of_device.h> #include <linux/of_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h> #include <linux/regmap.h>
static const struct mfd_cell rn5t618_cells[] = { 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 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 */ /* disable automatic repower-on */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT, 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 */ /* start power-off sequence */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT, regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF); 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[] = { static const struct of_device_id rn5t618_of_match[] = {
{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
@ -102,13 +125,21 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
return ret; return ret;
} }
rn5t618_pm_power_off = priv;
if (of_device_is_system_power_controller(i2c->dev.of_node)) { if (of_device_is_system_power_controller(i2c->dev.of_node)) {
if (!pm_power_off) { if (!pm_power_off)
rn5t618_pm_power_off = priv;
pm_power_off = rn5t618_power_off; pm_power_off = rn5t618_power_off;
} else { else
dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); 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; return 0;