[PATCH net-next v3 2/2] nfc: s3fwrn5: i2c: Enable the pvdd supply

[Asdlerto Korry via B4 Relay <devnull+korryasdlerto.gmail.com@kernel.org>]

From: Asdlerto Korry <korryasdlerto@gmail.com>

Get and enable the optional PVDD supply before the enable GPIO is
driven. Boards that switch this supply from the SoC no longer have to
mark the regulator always-on.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Asdlerto Korry <korryasdlerto@gmail.com>
---
 drivers/nfc/s3fwrn5/i2c.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
index 4ba762611711..eaa9a1f75533 100644
--- a/drivers/nfc/s3fwrn5/i2c.c
+++ b/drivers/nfc/s3fwrn5/i2c.c
@@ -11,6 +11,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/delay.h>
 #include <linux/module.h>
+#include <linux/regulator/consumer.h>
 
 #include <net/nfc/nfc.h>
 
@@ -160,6 +161,12 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client)
 	phy->i2c_dev = client;
 	i2c_set_clientdata(client, phy);
 
+	/* The chip has to be powered before EN is driven */
+	ret = devm_regulator_get_enable_optional(&client->dev, "pvdd");
+	if (ret && ret != -ENODEV)
+		return dev_err_probe(&client->dev, ret,
+				     "failed to enable pvdd supply\n");
+
 	phy->common.gpio_en = devm_gpiod_get(&client->dev, "en", GPIOD_OUT_HIGH);
 	if (IS_ERR(phy->common.gpio_en))
 		return PTR_ERR(phy->common.gpio_en);

-- 
2.25.1