NFC: st21nfca: Covert to use GPIO descriptor

Since we got rid of platform data, the driver may use GPIO descriptor
directly.

Looking deeply to the use of the GPIO pin it looks like it should be
a fixed voltage regulator rather than custom GPIO handling. But this
is out of scope of the change.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/st21nfca/i2c.c

@@ -67,8 +67,7 @@ struct st21nfca_i2c_phy {
 	struct i2c_client *i2c_dev;
 	struct nfc_hci_dev *hdev;
 
-	unsigned int gpio_ena;
-
+	struct gpio_desc *gpiod_ena;
 	struct st21nfca_se_status se_status;
 
 	struct sk_buff *pending_skb;
@@ -149,7 +148,7 @@ static int st21nfca_hci_i2c_enable(void *phy_id)
 {
 	struct st21nfca_i2c_phy *phy = phy_id;
 
-	gpio_set_value(phy->gpio_ena, 1);
+	gpiod_set_value(phy->gpiod_ena, 1);
 	phy->powered = 1;
 	phy->run_mode = ST21NFCA_HCI_MODE;
 
@@ -162,7 +161,7 @@ static void st21nfca_hci_i2c_disable(void *phy_id)
 {
 	struct st21nfca_i2c_phy *phy = phy_id;
 
-	gpio_set_value(phy->gpio_ena, 0);
+	gpiod_set_value(phy->gpiod_ena, 0);
 
 	phy->powered = 0;
 }
@@ -505,20 +504,17 @@ static struct nfc_phy_ops i2c_phy_ops = {
 static int st21nfca_hci_i2c_acpi_request_resources(struct i2c_client *client)
 {
 	struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
-	struct gpio_desc *gpiod_ena;
 	struct device *dev = &client->dev;
 	u8 tmp;
 
 	/* Get EN GPIO from ACPI */
-	gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 1,
-					 GPIOD_OUT_LOW);
-	if (IS_ERR(gpiod_ena)) {
+	phy->gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 1,
+					      GPIOD_OUT_LOW);
+	if (IS_ERR(phy->gpiod_ena)) {
 		nfc_err(dev, "Unable to get ENABLE GPIO\n");
-		return PTR_ERR(gpiod_ena);
+		return PTR_ERR(phy->gpiod_ena);
 	}
 
-	phy->gpio_ena = desc_to_gpio(gpiod_ena);
-
 	phy->se_status.is_ese_present = false;
 	phy->se_status.is_uicc_present = false;
 
@@ -538,31 +534,21 @@ static int st21nfca_hci_i2c_acpi_request_resources(struct i2c_client *client)
 static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
 {
 	struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
+	struct device *dev = &client->dev;
 	struct device_node *pp;
-	int gpio;
-	int r;
 
 	pp = client->dev.of_node;
 	if (!pp)
 		return -ENODEV;
 
 	/* Get GPIO from device tree */
-	gpio = of_get_named_gpio(pp, "enable-gpios", 0);
-	if (gpio < 0) {
-		nfc_err(&client->dev, "Failed to retrieve enable-gpios from device tree\n");
-		return gpio;
+	phy->gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 0,
+					      GPIOD_OUT_HIGH);
+	if (IS_ERR(phy->gpiod_ena)) {
+		nfc_err(dev, "Failed to request enable pin\n");
+		return PTR_ERR(phy->gpiod_ena);
 	}
 
-	/* GPIO request and configuration */
-	r = devm_gpio_request_one(&client->dev, gpio, GPIOF_OUT_INIT_HIGH,
-				  ST21NFCA_GPIO_NAME_EN);
-	if (r) {
-		nfc_err(&client->dev, "Failed to request enable pin\n");
-		return r;
-	}
-
-	phy->gpio_ena = gpio;
-
 	phy->se_status.is_ese_present =
 				of_property_read_bool(pp, "ese-present");
 	phy->se_status.is_uicc_present =