[PATCH 1/1] gpio: pca954x: Add optional regulator enable.

[Phil Reid <preid@xxxxxxxxxxxxxxxxx>]

Some i2c gpio devices are connected to a switchale power supply
which needs to be enabled prior to probing the device. This patch
allows the drive to enable the devices vcc regulator prior to probing.

Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx>
---
 drivers/gpio/gpio-pca953x.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 5e3be32..12d8e91 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -21,6 +21,7 @@
 #include <asm/unaligned.h>
 #include <linux/of_platform.h>
 #include <linux/acpi.h>
+#include <linux/regulator/consumer.h>
 
 #define PCA953X_INPUT		0
 #define PCA953X_OUTPUT		1
@@ -744,6 +745,7 @@ static int pca953x_probe(struct i2c_client *client,
 	int irq_base = 0;
 	int ret;
 	u32 invert = 0;
+	struct regulator *reg;
 
 	chip = devm_kzalloc(&client->dev,
 			sizeof(struct pca953x_chip), GFP_KERNEL);
@@ -763,6 +765,22 @@ static int pca953x_probe(struct i2c_client *client,
 
 	chip->client = client;
 
+	reg = devm_regulator_get_optional(&client->dev, "vcc");
+	if (IS_ERR(reg)) {
+		ret = PTR_ERR(reg);
+		if (ret != -ENODEV) {
+			if (ret != -EPROBE_DEFER)
+				dev_err(&client->dev, "reg get err: %d\n", ret);
+			return ret;
+		}
+	} else {
+		ret = regulator_enable(reg);
+		if (ret) {
+			dev_err(&client->dev, "reg en err: %d\n", ret);
+			return ret;
+		}
+	}
+
 	if (id) {
 		chip->driver_data = id->driver_data;
 	} else {
-- 
1.8.3.1

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