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@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/regulator/arizona-ldo1.c b/drivers/regulator/arizona-ldo1.c
index e3c5982a66a0..f7c88ff90c43 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;
                 }
         }