gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one chip per node

The change:

7b8792bbdffdff3abda704f89c6a45ea97afdc62
gpiolib: of: Correct error handling in of_get_named_gpiod_flags

assumed that only one gpio-chip is registred per of-node.
Some drivers register more than one chip per of-node, so
adjust the matching function of_gpiochip_find_and_xlate to
not stop looking for chips if a node-match is found and
the translation fails.

Cc: Stable <stable@vger.kernel.org>
Fixes: 7b8792bbdffd ("gpiolib: of: Correct error handling in of_get_named_gpiod_flags")
Signed-off-by: Hans Holmberg <hans.holmberg@intel.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Tested-by: Tyler Hall <tylerwhall@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 8cad8e4..4650bf8 100644 (file)
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -46,12 +46,13 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
 
        ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
        if (ret < 0) {
-               /* We've found the gpio chip, but the translation failed.
-                * Return true to stop looking and return the translation
-                * error via out_gpio
+               /* We've found a gpio chip, but the translation failed.
+                * Store translation error in out_gpio.
+                * Return false to keep looking, as more than one gpio chip
+                * could be registered per of-node.
                 */
                gg_data->out_gpio = ERR_PTR(ret);
-               return true;
+               return false;
         }
 
        gg_data->out_gpio = gpiochip_get_desc(gc, ret);