reset: add reset_release_all()

Add reset_release_all() method which Assert/Free an
array of resets signal that has been previously successfully
requested by reset_get_by_*()

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/reset/reset-uclass.c

@@ -42,6 +42,7 @@ int reset_get_by_index(struct udevice *dev, int index,
 
 	debug("%s(dev=%p, index=%d, reset_ctl=%p)\n", __func__, dev, index,
 	      reset_ctl);
+	reset_ctl->dev = NULL;
 
 	ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
 					  index, &args);
@@ -87,6 +88,7 @@ int reset_get_by_name(struct udevice *dev, const char *name,
 
 	debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
 	      reset_ctl);
+	reset_ctl->dev = NULL;
 
 	index = dev_read_stringlist_search(dev, "reset-names", name);
 	if (index < 0) {
@@ -133,6 +135,29 @@ int reset_deassert(struct reset_ctl *reset_ctl)
 	return ops->rst_deassert(reset_ctl);
 }
 
+int reset_release_all(struct reset_ctl *reset_ctl, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
+
+		/* check if reset has been previously requested */
+		if (!reset_ctl[i].dev)
+			continue;
+
+		ret = reset_assert(&reset_ctl[i]);
+		if (ret)
+			return ret;
+
+		ret = reset_free(&reset_ctl[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 UCLASS_DRIVER(reset) = {
 	.id		= UCLASS_RESET,
 	.name		= "reset",

include/reset.h

@@ -144,6 +144,18 @@ int reset_assert(struct reset_ctl *reset_ctl);
  */
 int reset_deassert(struct reset_ctl *reset_ctl);
 
+/**
+ * reset_release_all - Assert/Free an array of previously requested resets.
+ *
+ * For each reset contained in the reset array, this function will check if
+ * reset has been previously requested and then will assert and free it.
+ *
+ * @reset_ctl:	A reset struct array that was previously successfully
+ *		requested by reset_get_by_*().
+ * @count	Number of reset contained in the array
+ * @return 0 if OK, or a negative error code.
+ */
+int reset_release_all(struct reset_ctl *reset_ctl, int count);
 #else
 static inline int reset_get_by_index(struct udevice *dev, int index,
 				     struct reset_ctl *reset_ctl)
@@ -171,6 +183,12 @@ static inline int reset_deassert(struct reset_ctl *reset_ctl)
 {
 	return 0;
 }
+
+static inline int reset_release_all(struct reset_ctl *reset_ctl, int count)
+{
+	return 0;
+}
+
 #endif
 
 #endif