dm: gpio: Add an implementation for gpio_get_number()

This has a prototype but no implementation. It returns the global GPIO number
given a gpio_desc. It is useful for debugging in some cases.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index ca94bbb..381868b 100644 (file)
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -685,6 +685,18 @@ static int gpio_renumber(struct udevice *removed_dev)
        return 0;
 }
 
+int gpio_get_number(struct gpio_desc *desc)
+{
+       struct udevice *dev = desc->dev;
+       struct gpio_dev_priv *uc_priv;
+
+       if (!dev)
+               return -1;
+       uc_priv = dev->uclass_priv;
+
+       return uc_priv->gpio_base + desc->offset;
+}
+
 static int gpio_post_probe(struct udevice *dev)
 {
        struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);