gpio: improve error reporting on own descriptors

When requesting own descriptors through hogs, it is useful to
get some details about what's going on if we encounter problems.

Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 07b83a9..7f87b9b 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2131,13 +2131,15 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,
 
        local_desc = gpiochip_request_own_desc(chip, hwnum, name);
        if (IS_ERR(local_desc)) {
-               pr_err("requesting own GPIO %s failed\n", name);
+               pr_err("requesting hog GPIO %s (chip %s, offset %d) failed\n",
+                      name, chip->label, hwnum);
                return PTR_ERR(local_desc);
        }
 
        status = gpiod_configure_flags(desc, name, lflags, dflags);
        if (status < 0) {
-               pr_err("setup of GPIO %s failed\n", name);
+               pr_err("setup of hog GPIO %s (chip %s, offset %d) failed\n",
+                      name, chip->label, hwnum);
                gpiochip_free_own_desc(desc);
                return status;
        }