usb: gadget: at91_udc: Convert to GPIO descriptors

Replace the legacy GPIO APIs with gpio descriptor consumer
interface. Remove all gpio inversion(active low) flags as it is
already handled by the gpiod_set_value() and gpiod_get_value()
functions.
Reviewed-by: Dan Sneddon <dan.sneddon@microchip.com>
Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@microchip.com>
Link: https://lore.kernel.org/r/20211026085610.25264-1-balamanikandan.gunasundar@microchip.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/at91_udc.c

@@ -25,7 +25,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/platform_data/atmel.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
@@ -1510,7 +1510,6 @@ static irqreturn_t at91_udc_irq (int irq, void *_udc)
 
 static void at91_vbus_update(struct at91_udc *udc, unsigned value)
 {
-	value ^= udc->board.vbus_active_low;
 	if (value != udc->vbus)
 		at91_vbus_session(&udc->gadget, value);
 }
@@ -1521,7 +1520,7 @@ static irqreturn_t at91_vbus_irq(int irq, void *_udc)
 
 	/* vbus needs at least brief debouncing */
 	udelay(10);
-	at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
+	at91_vbus_update(udc, gpiod_get_value(udc->board.vbus_pin));
 
 	return IRQ_HANDLED;
 }
@@ -1531,7 +1530,7 @@ static void at91_vbus_timer_work(struct work_struct *work)
 	struct at91_udc *udc = container_of(work, struct at91_udc,
 					    vbus_timer_work);
 
-	at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
+	at91_vbus_update(udc, gpiod_get_value_cansleep(udc->board.vbus_pin));
 
 	if (!timer_pending(&udc->vbus_timer))
 		mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
@@ -1595,7 +1594,6 @@ static void at91udc_shutdown(struct platform_device *dev)
 static int at91rm9200_udc_init(struct at91_udc *udc)
 {
 	struct at91_ep *ep;
-	int ret;
 	int i;
 
 	for (i = 0; i < NUM_ENDPOINTS; i++) {
@@ -1615,32 +1613,23 @@ static int at91rm9200_udc_init(struct at91_udc *udc)
 		}
 	}
 
-	if (!gpio_is_valid(udc->board.pullup_pin)) {
+	if (!udc->board.pullup_pin) {
 		DBG("no D+ pullup?\n");
 		return -ENODEV;
 	}
 
-	ret = devm_gpio_request(&udc->pdev->dev, udc->board.pullup_pin,
-				"udc_pullup");
-	if (ret) {
-		DBG("D+ pullup is busy\n");
-		return ret;
-	}
-
-	gpio_direction_output(udc->board.pullup_pin,
-			      udc->board.pullup_active_low);
+	gpiod_direction_output(udc->board.pullup_pin,
+			       gpiod_is_active_low(udc->board.pullup_pin));
 
 	return 0;
 }
 
 static void at91rm9200_udc_pullup(struct at91_udc *udc, int is_on)
 {
-	int active = !udc->board.pullup_active_low;
-
 	if (is_on)
-		gpio_set_value(udc->board.pullup_pin, active);
+		gpiod_set_value(udc->board.pullup_pin, 1);
 	else
-		gpio_set_value(udc->board.pullup_pin, !active);
+		gpiod_set_value(udc->board.pullup_pin, 0);
 }
 
 static const struct at91_udc_caps at91rm9200_udc_caps = {
@@ -1783,20 +1772,20 @@ static void at91udc_of_init(struct at91_udc *udc, struct device_node *np)
 {
 	struct at91_udc_data *board = &udc->board;
 	const struct of_device_id *match;
-	enum of_gpio_flags flags;
 	u32 val;
 
 	if (of_property_read_u32(np, "atmel,vbus-polled", &val) == 0)
 		board->vbus_polled = 1;
 
-	board->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
-						  &flags);
-	board->vbus_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
-
-	board->pullup_pin = of_get_named_gpio_flags(np, "atmel,pullup-gpio", 0,
-						  &flags);
+	board->vbus_pin = gpiod_get_from_of_node(np, "atmel,vbus-gpio", 0,
+						 GPIOD_IN, "udc_vbus");
+	if (IS_ERR(board->vbus_pin))
+		board->vbus_pin = NULL;
 
-	board->pullup_active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
+	board->pullup_pin = gpiod_get_from_of_node(np, "atmel,pullup-gpio", 0,
+						   GPIOD_ASIS, "udc_pullup");
+	if (IS_ERR(board->pullup_pin))
+		board->pullup_pin = NULL;
 
 	match = of_match_node(at91_udc_dt_ids, np);
 	if (match)
@@ -1886,22 +1875,14 @@ static int at91udc_probe(struct platform_device *pdev)
 		goto err_unprepare_iclk;
 	}
 
-	if (gpio_is_valid(udc->board.vbus_pin)) {
-		retval = devm_gpio_request(dev, udc->board.vbus_pin,
-					   "udc_vbus");
-		if (retval) {
-			DBG("request vbus pin failed\n");
-			goto err_unprepare_iclk;
-		}
-
-		gpio_direction_input(udc->board.vbus_pin);
+	if (udc->board.vbus_pin) {
+		gpiod_direction_input(udc->board.vbus_pin);
 
 		/*
 		 * Get the initial state of VBUS - we cannot expect
 		 * a pending interrupt.
 		 */
-		udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
-			udc->board.vbus_active_low;
+		udc->vbus = gpiod_get_value_cansleep(udc->board.vbus_pin);
 
 		if (udc->board.vbus_polled) {
 			INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
@@ -1910,7 +1891,7 @@ static int at91udc_probe(struct platform_device *pdev)
 				  jiffies + VBUS_POLL_TIMEOUT);
 		} else {
 			retval = devm_request_irq(dev,
-					gpio_to_irq(udc->board.vbus_pin),
+					gpiod_to_irq(udc->board.vbus_pin),
 					at91_vbus_irq, 0, driver_name, udc);
 			if (retval) {
 				DBG("request vbus irq %d failed\n",
@@ -1988,8 +1969,8 @@ static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
 		enable_irq_wake(udc->udp_irq);
 
 	udc->active_suspend = wake;
-	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled && wake)
-		enable_irq_wake(udc->board.vbus_pin);
+	if (udc->board.vbus_pin && !udc->board.vbus_polled && wake)
+		enable_irq_wake(gpiod_to_irq(udc->board.vbus_pin));
 	return 0;
 }
 
@@ -1998,9 +1979,9 @@ static int at91udc_resume(struct platform_device *pdev)
 	struct at91_udc *udc = platform_get_drvdata(pdev);
 	unsigned long	flags;
 
-	if (gpio_is_valid(udc->board.vbus_pin) && !udc->board.vbus_polled &&
+	if (udc->board.vbus_pin && !udc->board.vbus_polled &&
 	    udc->active_suspend)
-		disable_irq_wake(udc->board.vbus_pin);
+		disable_irq_wake(gpiod_to_irq(udc->board.vbus_pin));
 
 	/* maybe reconnect to host; if so, clocks on */
 	if (udc->active_suspend)

drivers/usb/gadget/udc/at91_udc.h

@@ -109,11 +109,9 @@ struct at91_udc_caps {
 };
 
 struct at91_udc_data {
-	int	vbus_pin;		/* high == host powering us */
-	u8	vbus_active_low;	/* vbus polarity */
+	struct gpio_desc  *vbus_pin;		/* high == host powering us */
 	u8	          vbus_polled;		/* Use polling, not interrupt */
-	int	pullup_pin;		/* active == D+ pulled up */
-	u8	pullup_active_low;	/* true == pullup_pin is active low */
+	struct gpio_desc  *pullup_pin;		/* active == D+ pulled up */
 };
 
 /*