reset: Add acquire/release support for arrays

Add implementations that apply acquire and release operations to all
reset controls part of a reset control array.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

2 files changed, 41 insertions, 1 deletions

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index f94da91c22af..81ea77cba123 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -245,6 +245,34 @@ err:
         return ret;
 }
 
+static int reset_control_array_acquire(struct reset_control_array *resets)
+{
+        unsigned int i;
+        int err;
+
+        for (i = 0; i < resets->num_rstcs; i++) {
+                err = reset_control_acquire(resets->rstc[i]);
+                if (err < 0)
+                        goto release;
+        }
+
+        return 0;
+
+release:
+        while (i--)
+                reset_control_release(resets->rstc[i]);
+
+        return err;
+}
+
+static void reset_control_array_release(struct reset_control_array *resets)
+{
+        unsigned int i;
+
+        for (i = 0; i < resets->num_rstcs; i++)
+                reset_control_release(resets->rstc[i]);
+}
+
 static inline bool reset_control_is_array(struct reset_control *rstc)
 {
         return rstc->array;
@@ -464,6 +492,9 @@ int reset_control_acquire(struct reset_control *rstc)
         if (WARN_ON(IS_ERR(rstc)))
                 return -EINVAL;
 
+        if (reset_control_is_array(rstc))
+                return reset_control_array_acquire(rstc_to_array(rstc));
+
         mutex_lock(&reset_list_mutex);
 
         if (rstc->acquired) {
@@ -502,7 +533,10 @@ void reset_control_release(struct reset_control *rstc)
         if (!rstc || WARN_ON(IS_ERR(rstc)))
                 return;
 
-        rstc->acquired = false;
+        if (reset_control_is_array(rstc))
+                reset_control_array_release(rstc_to_array(rstc));
+        else
+                rstc->acquired = false;
 }
 EXPORT_SYMBOL_GPL(reset_control_release);
 
diff --git a/include/linux/reset.h b/include/linux/reset.h
index a01b32bf51d4..95d555c2130a 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -471,6 +471,12 @@ of_reset_control_array_get_exclusive(struct device_node *node)
 }
 
 static inline struct reset_control *
+of_reset_control_array_get_exclusive_released(struct device_node *node)
+{
+        return of_reset_control_array_get(node, false, false, false);
+}
+
+static inline struct reset_control *
 of_reset_control_array_get_shared(struct device_node *node)
 {
         return of_reset_control_array_get(node, true, false, true);