Re: [PATCH 5/5] mfd: rn5t618: register restart handler

From: Marcel Ziswiler <marcel@ziswiler.com>
To: Stefan Agner <stefan@agner.ch>,
	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, 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
Subject: Re: [PATCH 5/5] mfd: rn5t618: register restart handler
Date: Mon, 06 Jun 2016 15:25:06 +0200	[thread overview]
Message-ID: <56D9496A-2927-4D23-B8E2-A1A06F03A654@ziswiler.com> (raw)
In-Reply-To: <20160605001749.4062-7-stefan@agner.ch>

On June 5, 2016 2:17:49 AM GMT+02:00, Stefan Agner <stefan@agner.ch> wrote:
>Use the PMIC's repower capability for reboots. Register a restart
>handler with use a default priority of 128.

Apart from that last sentence above which is not clear to me the whole series looks fine to me.

Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

>Signed-off-by: Stefan Agner <stefan@agner.ch>
>---
> 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 d9b4d40..d9bd61c 100644
>--- a/drivers/mfd/rn5t618.c
>+++ b/drivers/mfd/rn5t618.c
>@@ -12,13 +12,17 @@
> * 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>
> 
>+#include <asm/system_misc.h>
>+
> static const struct mfd_cell rn5t618_cells[] = {
> 	{ .name = "rn5t618-regulator" },
> 	{ .name = "rn5t618-wdt" },
>@@ -50,17 +54,34 @@ 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);
>+
>+	mdelay(10);
>+
>+	return NOTIFY_DONE;
>+}
>+
>+
> static const struct of_device_id rn5t618_of_match[] = {
> 	{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
> 	{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
>@@ -103,13 +124,22 @@ 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_err(&i2c->dev, "Failed to set poweroff capability, already
>defined\n");
>-		}
>+	}
>+
>+	rn5t618_restart_handler.notifier_call = rn5t618_restart;
>+	rn5t618_restart_handler.priority = 128;
>+
>+	ret = register_restart_handler(&rn5t618_restart_handler);
>+	if (ret) {
>+		dev_err(&i2c->dev, "%s: cannot register restart handler, %d\n",
>+				__func__, ret);
>+		return ret;
> 	}
> 
> 	return 0;