From: Stefan Agner <stefan@agner.ch>
To: lee.jones@linaro.org, lgirdwood@gmail.com, broonie@kernel.org,
khilman@baylibre.com, carlo@caione.org
Cc: b.galvani@gmail.com, max.oss.09@gmail.com, marcel@ziswiler.com,
linux@armlinux.org.uk, galak@codeaurora.org,
ijc+devicetree@hellion.org.uk, mark.rutland@arm.com,
pawel.moll@arm.com, robh+dt@kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-amlogic@lists.infradead.org, Stefan Agner <stefan@agner.ch>
Subject: [PATCH v3 5/5] mfd: rn5t618: register restart handler
Date: Sat, 25 Jun 2016 18:15:15 -0700 [thread overview]
Message-ID: <20160626011515.4428-6-stefan@agner.ch> (raw)
In-Reply-To: <20160626011515.4428-1-stefan@agner.ch>
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>
---
drivers/mfd/rn5t618.c | 42 ++++++++++++++++++++++++++++++++++++------
1 file changed, 36 insertions(+), 6 deletions(-)
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
index 1831740..14f3b5f 100644
--- a/drivers/mfd/rn5t618.c
+++ b/drivers/mfd/rn5t618.c
@@ -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 +52,37 @@ 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);
/* 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);
+
+ /*
+ * Repower factor detection on PMIC side is not instant. 1ms
+ * proved to be enouth 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 +124,21 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
return ret;
}
+ rn5t618_pm_power_off = priv;
if (of_device_is_system_power_controller(i2c->dev.of_node)) {
- if (!pm_power_off) {
- rn5t618_pm_power_off = priv;
+ 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;
--
2.8.3
next prev parent reply other threads:[~2016-06-26 1:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-26 1:15 [PATCH v3 0/5] regulator: add Ricoh RN5T567 PMIC support Stefan Agner
2016-06-26 1:15 ` [PATCH v3 1/5] ARM: dts: meson: minix-neo-x8: define PMIC as power controller Stefan Agner
[not found] ` <20160626011515.4428-2-stefan-XLVq0VzYD2Y@public.gmane.org>
2016-06-27 8:45 ` Carlo Caione
2016-06-26 1:15 ` [PATCH v3 2/5] mfd: add Ricoh RN5T567 PMIC support Stefan Agner
2016-06-29 18:05 ` Applied "mfd: rn5t618: Add Ricoh RN5T567 PMIC support" to the regulator tree Mark Brown
2016-06-30 7:43 ` Lee Jones
2016-06-26 1:15 ` [PATCH v3 3/5] regulator: rn5t618: add RN5T567 PMIC support Stefan Agner
2016-06-26 1:15 ` [PATCH v3 4/5] mfd: rn5t618: register power off callback optionally Stefan Agner
[not found] ` <20160626011515.4428-5-stefan-XLVq0VzYD2Y@public.gmane.org>
2016-06-29 18:05 ` Applied "mfd: rn5t618: Register power off callback optionally" to the regulator tree Mark Brown
2016-06-26 1:15 ` Stefan Agner [this message]
2016-06-26 15:13 ` [v3,5/5] mfd: rn5t618: register restart handler Guenter Roeck
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