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phy: Add devm_of_phy_optional_get() helper

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Add an optional variant of devm_of_phy_get() that also takes care of
printing real errors, so drivers no longer have to open-code this
operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/4cd0069bcff424ffc5c3a102397c02370b91985b.1674584626.git.geert+renesas@glider.be
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2023-01-24 19:37:22 +01:00 committed by Vinod Koul
parent 59c3d3d00d
commit d02aa181ee
3 changed files with 44 additions and 2 deletions
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7
Documentation/driver-api/phy/phy.rst
View File

@ -108,6 +108,9 @@ it. This framework provides the following APIs to get a reference to the PHY.
const char *string);
struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
const char *con_id);
struct phy *devm_of_phy_optional_get(struct device *dev,
struct device_node *np,
const char *con_id);
struct phy *devm_of_phy_get_by_index(struct device *dev,
struct device_node *np,
int index);
@ -119,8 +122,8 @@ non-dt boot, it should contain the label of the PHY. The two
devm_phy_get associates the device with the PHY using devres on
successful PHY get. On driver detach, release function is invoked on
the devres data and devres data is freed.
devm_phy_optional_get should be used when the phy is optional. This
function will never return -ENODEV, but instead returns NULL when
The _optional_get variants should be used when the phy is optional. These
functions will never return -ENODEV, but instead return NULL when
the phy cannot be found.
Some generic drivers, such as ehci, may use multiple phys. In this case,
devm_of_phy_get or devm_of_phy_get_by_index can be used to get a phy

30
drivers/phy/phy-core.c
View File

@ -858,6 +858,36 @@ struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
}
EXPORT_SYMBOL_GPL(devm_of_phy_get);
/**
* devm_of_phy_optional_get() - lookup and obtain a reference to an optional
* phy.
* @dev: device that requests this phy
* @np: node containing the phy
* @con_id: name of the phy from device's point of view
*
* Gets the phy using of_phy_get(), and associates a device with it using
* devres. On driver detach, release function is invoked on the devres data,
* then, devres data is freed. This differs to devm_of_phy_get() in
* that if the phy does not exist, it is not considered an error and
* -ENODEV will not be returned. Instead the NULL phy is returned,
* which can be passed to all other phy consumer calls.
*/
struct phy *devm_of_phy_optional_get(struct device *dev, struct device_node *np,
const char *con_id)
{
struct phy *phy = devm_of_phy_get(dev, np, con_id);
if (PTR_ERR(phy) == -ENODEV)
phy = NULL;
if (IS_ERR(phy))
dev_err_probe(dev, PTR_ERR(phy), "failed to get PHY %pOF:%s",
np, con_id);
return phy;
}
EXPORT_SYMBOL_GPL(devm_of_phy_optional_get);
/**
* devm_of_phy_get_by_index() - lookup and obtain a reference to a phy by index.
* @dev: device that requests this phy

9
include/linux/phy/phy.h
View File

@ -254,6 +254,8 @@ struct phy *devm_phy_get(struct device *dev, const char *string);
struct phy *devm_phy_optional_get(struct device *dev, const char *string);
struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
const char *con_id);
struct phy *devm_of_phy_optional_get(struct device *dev, struct device_node *np,
const char *con_id);
struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
int index);
void of_phy_put(struct phy *phy);
@ -443,6 +445,13 @@ static inline struct phy *devm_of_phy_get(struct device *dev,
return ERR_PTR(-ENOSYS);
}
static inline struct phy *devm_of_phy_optional_get(struct device *dev,
struct device_node *np,
const char *con_id)
{
return NULL;
}
static inline struct phy *devm_of_phy_get_by_index(struct device *dev,
struct device_node *np,
int index)