dm: gpio: Fix gpio_get_list_count failing with livetree

of_parse_phandle_with_args (called by dev_read_phandle_with_args) does not
support getting the length of a phandle list by using the index -1.
Instead, use dev_count_phandle_with_args which supports exactly this
use-case.

Fixes: 8558217153 ("gpio: Convert to use APIs which support live DT")

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index e4e7f58..131099c 100644 (file)
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -1215,9 +1215,9 @@ int gpio_get_list_count(struct udevice *dev, const char *list_name)
 {
        int ret;
 
-       ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0, -1,
-                                        NULL);
-       if (ret) {
+       ret = dev_count_phandle_with_args(dev, list_name, "#gpio-cells",
+                                         -ENOENT);
+       if (ret < 0) {
                debug("%s: Node '%s', property '%s', GPIO count failed: %d\n",
                      __func__, dev->name, list_name, ret);
        }