[PATCH 2/2] reset: Let reset API's handle gracefully if reset_ctl is -ENODATA

[Kishon Vijay Abraham I]

Let reset API's (like reset_assert(), reset_deassert(), ..) handle
gracefully if the argument reset_ctl is -ENODATA. This is for seamlessly
handling client drivers which get optional reset controller using
devm_reset_control_get_optional().

Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
---
 drivers/reset/reset-uclass.c | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/reset/reset-uclass.c b/drivers/reset/reset-uclass.c
index 906f58ce3d..077ca956f4 100644
--- a/drivers/reset/reset-uclass.c
+++ b/drivers/reset/reset-uclass.c
@@ -162,7 +162,12 @@ int reset_get_by_name(struct udevice *dev, const char *name,
 
 int reset_request(struct reset_ctl *reset_ctl)
 {
-	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
+	struct reset_ops *ops;
+
+	if (IS_ERR(reset_ctl) && PTR_ERR(reset_ctl) == -ENODATA)
+		return 0;
+
+	ops = reset_dev_ops(reset_ctl->dev);
 
 	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
 
@@ -171,7 +176,12 @@ int reset_request(struct reset_ctl *reset_ctl)
 
 int reset_free(struct reset_ctl *reset_ctl)
 {
-	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
+	struct reset_ops *ops;
+
+	if (IS_ERR(reset_ctl) && PTR_ERR(reset_ctl) == -ENODATA)
+		return 0;
+
+	ops = reset_dev_ops(reset_ctl->dev);
 
 	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
 
@@ -180,7 +190,12 @@ int reset_free(struct reset_ctl *reset_ctl)
 
 int reset_assert(struct reset_ctl *reset_ctl)
 {
-	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
+	struct reset_ops *ops;
+
+	if (IS_ERR(reset_ctl) && PTR_ERR(reset_ctl) == -ENODATA)
+		return 0;
+
+	ops = reset_dev_ops(reset_ctl->dev);
 
 	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
 
@@ -202,7 +217,12 @@ int reset_assert_bulk(struct reset_ctl_bulk *bulk)
 
 int reset_deassert(struct reset_ctl *reset_ctl)
 {
-	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
+	struct reset_ops *ops;
+
+	if (IS_ERR(reset_ctl) && PTR_ERR(reset_ctl) == -ENODATA)
+		return 0;
+
+	ops = reset_dev_ops(reset_ctl->dev);
 
 	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
 
@@ -224,9 +244,12 @@ int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
 
 int reset_status(struct reset_ctl *reset_ctl)
 {
-	struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
+	struct reset_ops *ops;
 
-	debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
+	if (IS_ERR(reset_ctl) && PTR_ERR(reset_ctl) == -ENODATA)
+		return 0;
+
+	ops = reset_dev_ops(reset_ctl->dev);
 
 	return ops->rst_status(reset_ctl);
 }
-- 
2.17.1