reset: Move DT cell size check to the core

The core currently doesn't check that the DT cell size matches what the
driver declares, which means that every xlate function needs to duplicate
that check.

Make sure that of_reset_control_get checks for this to avoid duplication
and errors.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 4a63b379361c..f15f150b79da 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -45,9 +45,6 @@ struct reset_control {
 static int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
                           const struct of_phandle_args *reset_spec)
 {
-        if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
-                return -EINVAL;
-
         if (reset_spec->args[0] >= rcdev->nr_resets)
                 return -EINVAL;
 
@@ -178,6 +175,11 @@ struct reset_control *of_reset_control_get_by_index(struct device_node *node,
                 return ERR_PTR(-EPROBE_DEFER);
         }
 
+        if (WARN_ON(args.args_count != rcdev->of_reset_n_cells)) {
+                mutex_unlock(&reset_controller_list_mutex);
+                return ERR_PTR(-EINVAL);
+        }
+
         rstc_id = rcdev->of_xlate(rcdev, &args);
         if (rstc_id < 0) {
                 mutex_unlock(&reset_controller_list_mutex);