linux-kernel - [PATCH v4 4/5] mfd: rn5t618: register power off callback optionally

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Message-Id: <20160628062757.24490-5-stefan@agner.ch>
Date:	Mon, 27 Jun 2016 23:27:56 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	lee.jones@...aro.org, lgirdwood@...il.com, broonie@...nel.org,
	khilman@...libre.com, carlo@...one.org
Cc:	b.galvani@...il.com, max.oss.09@...il.com, marcel@...wiler.com,
	linux@...linux.org.uk, galak@...eaurora.org,
	ijc+devicetree@...lion.org.uk, mark.rutland@....com,
	pawel.moll@....com, robh+dt@...nel.org, linux@...ck-us.net,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH v4 4/5] mfd: rn5t618: register power off callback optionally

Only register power off if the PMIC is defined as system power
controller (see Documentation/devicetree/bindings/power/
power-controller.txt).

Signed-off-by: Stefan Agner <stefan@...er.ch>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
---
 drivers/mfd/rn5t618.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
index c86160d..1831740 100644
--- a/drivers/mfd/rn5t618.c
+++ b/drivers/mfd/rn5t618.c
@@ -102,9 +102,13 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	if (!pm_power_off) {
-		rn5t618_pm_power_off = priv;
-		pm_power_off = rn5t618_power_off;
+	if (of_device_is_system_power_controller(i2c->dev.of_node)) {
+		if (!pm_power_off) {
+			rn5t618_pm_power_off = priv;
+			pm_power_off = rn5t618_power_off;
+		} else {
+			dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
+		}
 	}
 
 	return 0;
-- 
2.8.3