linux-kernel - [PATCH 1/6] mfd: arizona: Factor out read of device tree GPIOs

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Message-Id: <1396340845-24060-2-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:	Tue,  1 Apr 2014 09:27:20 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	broonie@...nel.org
Cc:	lee.jones@...aro.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, rob@...dley.net, sameo@...ux.intel.com,
	lgirdwood@...il.com, ckeepax@...nsource.wolfsonmicro.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] mfd: arizona: Factor out read of device tree GPIOs

This patch factors out the reading of GPIOs for the Arizona devices
into a helper function.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c       |   33 ++++++++++++++++++++++++---------
 include/linux/mfd/arizona/core.h |    3 +++
 2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index a45aab9..8ad4373 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -512,19 +512,34 @@ int arizona_of_get_type(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(arizona_of_get_type);
 
+int arizona_of_get_named_gpio(struct arizona *arizona, const char *prop,
+			      bool mandatory, int *gpio)
+{
+	int ret;
+
+	ret = of_get_named_gpio(arizona->dev->of_node, prop, 0);
+	*gpio = ret;
+	if (ret >= 0)
+		return ret;
+
+	*gpio = 0;
+
+	if (mandatory)
+		dev_err(arizona->dev,
+			"Mandatory DT gpio %s missing/malformed: %d\n",
+			prop, ret);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(arizona_of_get_named_gpio);
+
 static int arizona_of_get_core_pdata(struct arizona *arizona)
 {
+	struct arizona_pdata *pdata = &arizona->pdata;
 	int ret, i;
 
-	arizona->pdata.reset = of_get_named_gpio(arizona->dev->of_node,
-						 "wlf,reset", 0);
-	if (arizona->pdata.reset < 0)
-		arizona->pdata.reset = 0;
-
-	arizona->pdata.ldoena = of_get_named_gpio(arizona->dev->of_node,
-						  "wlf,ldoena", 0);
-	if (arizona->pdata.ldoena < 0)
-		arizona->pdata.ldoena = 0;
+	arizona_of_get_named_gpio(arizona, "wlf,reset", true, &pdata->reset);
+	arizona_of_get_named_gpio(arizona, "wlf,ldoena", true, &pdata->ldoena);
 
 	ret = of_property_read_u32_array(arizona->dev->of_node,
 					 "wlf,gpio-defaults",
diff --git a/include/linux/mfd/arizona/core.h b/include/linux/mfd/arizona/core.h
index 5cf8b91..16150cc 100644
--- a/include/linux/mfd/arizona/core.h
+++ b/include/linux/mfd/arizona/core.h
@@ -124,4 +124,7 @@ int wm5102_patch(struct arizona *arizona);
 int wm5110_patch(struct arizona *arizona);
 int wm8997_patch(struct arizona *arizona);
 
+extern int arizona_of_get_named_gpio(struct arizona *arizona, const char *prop,
+				     bool mandatory, int *gpio);
+
 #endif
-- 
1.7.2.5

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