[PATCH v5 4/6] nfc: s3fwrn5: enable the PVDD supply

The controller is powered by an externally switched PVDD rail. Get and
enable it in the i2c phy probe, before any of the chip's pins is driven
or its clock started, so the chip's power does not depend on whatever
state the bootloader or platform left the rail in.

The uart phy (s3fwrn82) is unchanged: the PVDD pin exists on that part
too, but no in-tree DT describes an s3fwrn82, so an enable there would
power nothing and could not be tested. It can follow with the first
board that describes the rail.

Assisted-by: Claude:claude-fable-5
Signed-off-by: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
---
 drivers/nfc/s3fwrn5/i2c.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
index c528c085b43e..f93d8b47b65e 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>
 

@@ -158,6 +159,11 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client)
 	phy->i2c_dev = client;
 	i2c_set_clientdata(client, phy);
 
+	ret = devm_regulator_get_enable(&client->dev, "pvdd");
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "failed to enable pvdd\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);

-- 
2.55.0