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authorRamiro Oliveira <Ramiro.Oliveira@synopsys.com>2017-01-13 17:57:41 +0000
committerPhilipp Zabel <p.zabel@pengutronix.de>2017-01-20 10:36:15 +0100
commitbb475230b8e59a547ab66ac3b02572df21a580e9 (patch)
tree9fecc3af684950c395564fe3f5656ed1520589df /drivers/reset
parentee48c726d0b014ac8dd5ec803fb63ce0596a42cf (diff)
downloadlinux-bb475230b8e59a547ab66ac3b02572df21a580e9.tar.bz2
reset: make optional functions really optional
The *_get_optional_* functions weren't really optional so this patch makes them really optional. These *_get_optional_* functions will now return NULL instead of an error if no matching reset phandle is found in the DT, and all the reset_control_* functions now accept NULL rstc pointers. Signed-off-by: Ramiro Oliveira <Ramiro.Oliveira@synopsys.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/core.c49
1 files changed, 39 insertions, 10 deletions
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 272c1e4ecb5c..c79cce3a7b6d 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -143,12 +143,18 @@ EXPORT_SYMBOL_GPL(devm_reset_controller_register);
* a no-op.
* Consumers must not use reset_control_(de)assert on shared reset lines when
* reset_control_reset has been used.
+ *
+ * If rstc is NULL it is an optional reset and the function will just
+ * return 0.
*/
int reset_control_reset(struct reset_control *rstc)
{
int ret;
- if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+ if (!rstc)
+ return 0;
+
+ if (WARN_ON(IS_ERR(rstc)))
return -EINVAL;
if (!rstc->rcdev->ops->reset)
@@ -182,10 +188,17 @@ EXPORT_SYMBOL_GPL(reset_control_reset);
* internal state to be reset, but must be prepared for this to happen.
* Consumers must not use reset_control_reset on shared reset lines when
* reset_control_(de)assert has been used.
+ * return 0.
+ *
+ * If rstc is NULL it is an optional reset and the function will just
+ * return 0.
*/
int reset_control_assert(struct reset_control *rstc)
{
- if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+ if (!rstc)
+ return 0;
+
+ if (WARN_ON(IS_ERR(rstc)))
return -EINVAL;
if (!rstc->rcdev->ops->assert)
@@ -213,10 +226,17 @@ EXPORT_SYMBOL_GPL(reset_control_assert);
* After calling this function, the reset is guaranteed to be deasserted.
* Consumers must not use reset_control_reset on shared reset lines when
* reset_control_(de)assert has been used.
+ * return 0.
+ *
+ * If rstc is NULL it is an optional reset and the function will just
+ * return 0.
*/
int reset_control_deassert(struct reset_control *rstc)
{
- if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+ if (!rstc)
+ return 0;
+
+ if (WARN_ON(IS_ERR(rstc)))
return -EINVAL;
if (!rstc->rcdev->ops->deassert)
@@ -237,12 +257,15 @@ EXPORT_SYMBOL_GPL(reset_control_deassert);
/**
* reset_control_status - returns a negative errno if not supported, a
* positive value if the reset line is asserted, or zero if the reset
- * line is not asserted.
+ * line is not asserted or if the desc is NULL (optional reset).
* @rstc: reset controller
*/
int reset_control_status(struct reset_control *rstc)
{
- if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+ if (!rstc)
+ return 0;
+
+ if (WARN_ON(IS_ERR(rstc)))
return -EINVAL;
if (rstc->rcdev->ops->status)
@@ -299,7 +322,8 @@ static void __reset_control_put(struct reset_control *rstc)
}
struct reset_control *__of_reset_control_get(struct device_node *node,
- const char *id, int index, bool shared)
+ const char *id, int index, bool shared,
+ bool optional)
{
struct reset_control *rstc;
struct reset_controller_dev *r, *rcdev;
@@ -313,14 +337,18 @@ struct reset_control *__of_reset_control_get(struct device_node *node,
if (id) {
index = of_property_match_string(node,
"reset-names", id);
+ if (index == -EILSEQ)
+ return ERR_PTR(index);
if (index < 0)
- return ERR_PTR(-ENOENT);
+ return optional ? NULL : ERR_PTR(-ENOENT);
}
ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
index, &args);
- if (ret)
+ if (ret == -EINVAL)
return ERR_PTR(ret);
+ if (ret)
+ return optional ? NULL : ERR_PTR(ret);
mutex_lock(&reset_list_mutex);
rcdev = NULL;
@@ -379,7 +407,8 @@ static void devm_reset_control_release(struct device *dev, void *res)
}
struct reset_control *__devm_reset_control_get(struct device *dev,
- const char *id, int index, bool shared)
+ const char *id, int index, bool shared,
+ bool optional)
{
struct reset_control **ptr, *rstc;
@@ -389,7 +418,7 @@ struct reset_control *__devm_reset_control_get(struct device *dev,
return ERR_PTR(-ENOMEM);
rstc = __of_reset_control_get(dev ? dev->of_node : NULL,
- id, index, shared);
+ id, index, shared, optional);
if (!IS_ERR(rstc)) {
*ptr = rstc;
devres_add(dev, ptr);