gpiolib: Convert fwnode_get_named_gpiod() to configure GPIO

Make fwnode_get_named_gpiod() consistent with the rest of
gpiod_get() like API, i.e. configure GPIO pin immediately after
request.

Besides obvious clean up it will help to configure pins based
on firmware provided resources.

Reviewed-by: Mika Westerberg <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/devres.c

···
  * @dev:	GPIO consumer
  * @con_id:	function within the GPIO consumer
  * @child:	firmware node (child of @dev)
+ * @flags:	GPIO initialization flags
  *
  * GPIO descriptors returned from this function are automatically disposed on
  * driver detach.
+ *
+ * On successfull request the GPIO pin is configured in accordance with
+ * provided @flags.
  */
 struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
 					    const char *con_id,
-					    struct fwnode_handle *child)
+					    struct fwnode_handle *child,
+					    enum gpiod_flags flags)
 {
 	static const char * const suffixes[] = { "gpios", "gpio" };
 	char prop_name[32]; /* 32 is max size of property name */
···
 			snprintf(prop_name, sizeof(prop_name), "%s",
 							       suffixes[i]);
 
-		desc = fwnode_get_named_gpiod(child, prop_name);
+		desc = fwnode_get_named_gpiod(child, prop_name, flags);
 		if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT))
 			break;
 	}

drivers/gpio/gpiolib.c

···
  * fwnode_get_named_gpiod - obtain a GPIO from firmware node
  * @fwnode:	handle of the firmware node
  * @propname:	name of the firmware property representing the GPIO
+ * @dflags:	GPIO initialization flags
  *
  * This function can be used for drivers that get their configuration
  * from firmware.
···
  * underlying firmware interface and then makes sure that the GPIO
  * descriptor is requested before it is returned to the caller.
  *
+ * On successfull request the GPIO pin is configured in accordance with
+ * provided @dflags.
+ *
  * In case of error an ERR_PTR() is returned.
  */
 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
-					 const char *propname)
+					 const char *propname,
+					 enum gpiod_flags dflags)
 {
 	struct gpio_desc *desc = ERR_PTR(-ENODEV);
+	unsigned long lflags = 0;
 	bool active_low = false;
 	bool single_ended = false;
 	int ret;
···
 		return ERR_PTR(ret);
 
 	if (active_low)
-		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
+		lflags |= GPIO_ACTIVE_LOW;
 
 	if (single_ended) {
 		if (active_low)
-			set_bit(FLAG_OPEN_DRAIN, &desc->flags);
+			lflags |= GPIO_OPEN_DRAIN;
 		else
-			set_bit(FLAG_OPEN_SOURCE, &desc->flags);
+			lflags |= GPIO_OPEN_SOURCE;
+	}
+
+	ret = gpiod_configure_flags(desc, propname, lflags, dflags);
+	if (ret < 0) {
+		gpiod_put(desc);
+		return ERR_PTR(ret);
 	}
 
 	return desc;

drivers/input/keyboard/gpio_keys.c

···
 	spin_lock_init(&bdata->lock);
 
 	if (child) {
-		bdata->gpiod = devm_get_gpiod_from_child(dev, NULL, child);
+		bdata->gpiod = devm_get_gpiod_from_child(dev, NULL, child, GPIOD_IN);
 		if (IS_ERR(bdata->gpiod)) {
 			error = PTR_ERR(bdata->gpiod);
 			if (error == -ENOENT) {
···
 				if (error != -EPROBE_DEFER)
 					dev_err(dev, "failed to get gpio: %d\n",
 						error);
-				return error;
-			}
-		} else {
-			error = gpiod_direction_input(bdata->gpiod);
-			if (error) {
-				dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
-					desc_to_gpio(bdata->gpiod), error);
 				return error;
 			}
 		}

drivers/input/keyboard/gpio_keys_polled.c

···
 			}
 
 			bdata->gpiod = devm_get_gpiod_from_child(dev, NULL,
-								 child);
+								 child,
+								 GPIOD_IN);
 			if (IS_ERR(bdata->gpiod)) {
 				error = PTR_ERR(bdata->gpiod);
 				if (error != -EPROBE_DEFER)
 					dev_err(dev,
 						"failed to get gpio: %d\n",
 						error);
-				fwnode_handle_put(child);
-				return error;
-			}
-
-			error = gpiod_direction_input(bdata->gpiod);
-			if (error) {
-				dev_err(dev, "Failed to configure GPIO %d as input: %d\n",
-					desc_to_gpio(bdata->gpiod), error);
 				fwnode_handle_put(child);
 				return error;
 			}

drivers/leds/leds-gpio.c

···
 		const char *state = NULL;
 		struct device_node *np = to_of_node(child);
 
-		led.gpiod = devm_get_gpiod_from_child(dev, NULL, child);
+		led.gpiod = devm_get_gpiod_from_child(dev, NULL, child, GPIOD_ASIS);
 		if (IS_ERR(led.gpiod)) {
 			fwnode_handle_put(child);
 			return ERR_CAST(led.gpiod);

drivers/video/fbdev/amba-clcd-nomadik.c

···
 {
 	dev_info(dev, "TPG110 display init\n");
 
-	grestb = devm_get_gpiod_from_child(dev, "grestb", &np->fwnode);
+	/* This asserts the GRESTB signal, putting the display into reset */
+	grestb = devm_get_gpiod_from_child(dev, "grestb", &np->fwnode, GPIOD_OUT_HIGH);
 	if (IS_ERR(grestb)) {
 		dev_err(dev, "no GRESTB GPIO\n");
 		return;
 	}
-	/* This asserts the GRESTB signal, putting the display into reset */
-	gpiod_direction_output(grestb, 1);
-
-	scen = devm_get_gpiod_from_child(dev, "scen", &np->fwnode);
+	scen = devm_get_gpiod_from_child(dev, "scen", &np->fwnode, GPIOD_OUT_LOW);
 	if (IS_ERR(scen)) {
 		dev_err(dev, "no SCEN GPIO\n");
 		return;
 	}
-	gpiod_direction_output(scen, 0);
-	scl = devm_get_gpiod_from_child(dev, "scl", &np->fwnode);
+	scl = devm_get_gpiod_from_child(dev, "scl", &np->fwnode, GPIOD_OUT_LOW);
 	if (IS_ERR(scl)) {
 		dev_err(dev, "no SCL GPIO\n");
 		return;
 	}
-	gpiod_direction_output(scl, 0);
-	sda = devm_get_gpiod_from_child(dev, "sda", &np->fwnode);
+	sda = devm_get_gpiod_from_child(dev, "sda", &np->fwnode, GPIOD_OUT_LOW);
 	if (IS_ERR(sda)) {
 		dev_err(dev, "no SDA GPIO\n");
 		return;
 	}
-	gpiod_direction_output(sda, 0);
 	board->enable = tpg110_enable;
 	board->disable = tpg110_disable;
 }

include/linux/gpio/consumer.h

···
 struct fwnode_handle;
 
 struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
-					 const char *propname);
+					 const char *propname,
+					 enum gpiod_flags dflags);
 struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
 					    const char *con_id,
-					    struct fwnode_handle *child);
+					    struct fwnode_handle *child,
+					    enum gpiod_flags flags);
 #else /* CONFIG_GPIOLIB */
 
 static inline int gpiod_count(struct device *dev, const char *con_id)
···
 /* Child properties interface */
 struct fwnode_handle;
 
-static inline struct gpio_desc *fwnode_get_named_gpiod(
-	struct fwnode_handle *fwnode, const char *propname)
+static inline
+struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
+					 const char *propname,
+					 enum gpiod_flags dflags)
 {
 	return ERR_PTR(-ENOSYS);
 }
 
-static inline struct gpio_desc *devm_get_gpiod_from_child(
-	struct device *dev, const char *con_id, struct fwnode_handle *child)
+static inline
+struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
+					    const char *con_id,
+					    struct fwnode_handle *child,
+					    enum gpiod_flags flags)
 {
 	return ERR_PTR(-ENOSYS);
 }