1 files changed, 58 insertions, 15 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index abfbf546d159..3859911b61e9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -422,8 +422,16 @@ static int devprop_gpiochip_set_names(struct gpio_chip *chip)
 	if (count > chip->ngpio)
 		count = chip->ngpio;
 
-	for (i = 0; i < count; i++)
-		gdev->descs[i].name = names[chip->offset + i];
+	for (i = 0; i < count; i++) {
+		/*
+		 * Allow overriding "fixed" names provided by the GPIO
+		 * provider. The "fixed" names are more often than not
+		 * generic and less informative than the names given in
+		 * device properties.
+		 */
+		if (names[chip->offset + i] && names[chip->offset + i][0])
+			gdev->descs[i].name = names[chip->offset + i];
+	}
 
 	kfree(names);
 
@@ -593,12 +601,18 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 			       struct lock_class_key *lock_key,
 			       struct lock_class_key *request_key)
 {
-	struct fwnode_handle *fwnode = gc->parent ? dev_fwnode(gc->parent) : NULL;
-	unsigned long	flags;
-	int		ret = 0;
-	unsigned	i;
-	int		base = gc->base;
+	struct fwnode_handle *fwnode = NULL;
 	struct gpio_device *gdev;
+	unsigned long flags;
+	int base = gc->base;
+	unsigned int i;
+	int ret = 0;
+	u32 ngpios;
+
+	if (gc->fwnode)
+		fwnode = gc->fwnode;
+	else if (gc->parent)
+		fwnode = dev_fwnode(gc->parent);
 
 	/*
 	 * First: allocate and populate the internal stat container, and
@@ -646,6 +660,26 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 		goto err_free_dev_name;
 	}
 
+	/*
+	 * Try the device properties if the driver didn't supply the number
+	 * of GPIO lines.
+	 */
+	if (gc->ngpio == 0) {
+		ret = device_property_read_u32(&gdev->dev, "ngpios", &ngpios);
+		if (ret == -ENODATA)
+			/*
+			 * -ENODATA means that there is no property found and
+			 * we want to issue the error message to the user.
+			 * Besides that, we want to return different error code
+			 * to state that supplied value is not valid.
+			 */
+			ngpios = 0;
+		else if (ret)
+			goto err_free_descs;
+
+		gc->ngpio = ngpios;
+	}
+
 	if (gc->ngpio == 0) {
 		chip_err(gc, "tried to insert a GPIO chip with zero lines\n");
 		ret = -EINVAL;
@@ -708,10 +742,12 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 	INIT_LIST_HEAD(&gdev->pin_ranges);
 #endif
 
-	if (gc->names)
+	if (gc->names) {
 		ret = gpiochip_set_desc_names(gc);
-	else
-		ret = devprop_gpiochip_set_names(gc);
+		if (ret)
+			goto err_remove_from_list;
+	}
+	ret = devprop_gpiochip_set_names(gc);
 	if (ret)
 		goto err_remove_from_list;
 
@@ -3487,11 +3523,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
  */
 void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
 {
-	mutex_lock(&gpio_lookup_lock);
-
-	list_add_tail(&table->list, &gpio_lookup_list);
-
-	mutex_unlock(&gpio_lookup_lock);
+	gpiod_add_lookup_tables(&table, 1);
 }
 EXPORT_SYMBOL_GPL(gpiod_add_lookup_table);
 
@@ -3540,6 +3572,17 @@ void gpiod_add_hogs(struct gpiod_hog *hogs)
 }
 EXPORT_SYMBOL_GPL(gpiod_add_hogs);
 
+void gpiod_remove_hogs(struct gpiod_hog *hogs)
+{
+	struct gpiod_hog *hog;
+
+	mutex_lock(&gpio_machine_hogs_mutex);
+	for (hog = &hogs[0]; hog->chip_label; hog++)
+		list_del(&hog->list);
+	mutex_unlock(&gpio_machine_hogs_mutex);
+}
+EXPORT_SYMBOL_GPL(gpiod_remove_hogs);
+
 static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
 {
 	const char *dev_id = dev ? dev_name(dev) : NULL;