linux-kernel - [PATCH] regulator: arizona-ldo1: Fix handling of GPIO 0

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Message-ID: <1444901832-15980-1-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:	Thu, 15 Oct 2015 10:37:12 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	<broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] regulator: arizona-ldo1: Fix handling of GPIO 0

The LDO1 driver is using the arizona_of_get_named_gpio helper function
which will return 0 if an error was encountered whilst parsing the GPIO,
as under the pdata scheme 0 was not being treated as a valid GPIO.
However, since the regulator framework was expanded to allow the use of
GPIO 0 this causes us to attempt to register GPIO 0 when we encountered
an error parsing the device tree.

This patch uses of_get_named_gpio directly and sets the
ena_gpio_initialized flag based on the return value.

Fixes: 1de3821ace82 ("regulator: Set ena_gpio_initialized in regulator drivers")
Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/regulator/arizona-ldo1.c |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/regulator/arizona-ldo1.c b/drivers/regulator/arizona-ldo1.c
index e3c5982..f7c88ff 100644
--- a/drivers/regulator/arizona-ldo1.c
+++ b/drivers/regulator/arizona-ldo1.c
@@ -17,6 +17,7 @@
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
@@ -189,13 +190,22 @@ static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
 {
 	struct arizona_pdata *pdata = &arizona->pdata;
 	struct arizona_ldo1 *ldo1 = config->driver_data;
+	struct device_node *np = arizona->dev->of_node;
 	struct device_node *init_node, *dcvdd_node;
 	struct regulator_init_data *init_data;
 
-	pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true);
+	pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0);
+	if (pdata->ldoena < 0) {
+		dev_warn(arizona->dev,
+			 "LDOENA GPIO property missing/malformed: %d\n",
+			 pdata->ldoena);
+		pdata->ldoena = 0;
+	} else {
+		config->ena_gpio_initialized = true;
+	}
 
-	init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1");
-	dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0);
+	init_node = of_get_child_by_name(np, "ldo1");
+	dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
 
 	if (init_node) {
 		config->of_node = init_node;
@@ -274,8 +284,6 @@ static int arizona_ldo1_probe(struct platform_device *pdev)
 			ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
 			if (ret < 0)
 				return ret;
-
-			config.ena_gpio_initialized = true;
 		}
 	}
 
-- 
1.7.2.5

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