drivers: phy: Add support for optional phys
Add devm_phy_optional_get and phy_optional_get, which should be used when the phy is optional. They does not return an error when the phy does not exist, rather they returns NULL, which is considered as a valid phy, but results in NOPs when used with the consumer API. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Acked-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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@ -75,14 +75,20 @@ Before the controller can make use of the PHY, it has to get a reference to
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it. This framework provides the following APIs to get a reference to the PHY.
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struct phy *phy_get(struct device *dev, const char *string);
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struct phy *phy_optional_get(struct device *dev, const char *string);
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struct phy *devm_phy_get(struct device *dev, const char *string);
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struct phy *devm_phy_optional_get(struct device *dev, const char *string);
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phy_get and devm_phy_get can be used to get the PHY. In the case of dt boot,
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the string arguments should contain the phy name as given in the dt data and
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in the case of non-dt boot, it should contain the label of the PHY.
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The only difference between the two APIs is that devm_phy_get associates the
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device with the PHY using devres on successful PHY get. On driver detach,
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release function is invoked on the the devres data and devres data is freed.
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phy_get, phy_optional_get, devm_phy_get and devm_phy_optional_get can
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be used to get the PHY. In the case of dt boot, the string arguments
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should contain the phy name as given in the dt data and in the case of
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non-dt boot, it should contain the label of the PHY. The two
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devm_phy_get associates the device with the PHY using devres on
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successful PHY get. On driver detach, release function is invoked on
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the the devres data and devres data is freed. phy_optional_get and
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devm_phy_optional_get should be used when the phy is optional. These
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two functions will never return -ENODEV, but instead returns NULL when
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the phy cannot be found.
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It should be noted that NULL is a valid phy reference. All phy
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consumer calls on the NULL phy become NOPs. That is the release calls,
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@ -425,6 +425,27 @@ struct phy *phy_get(struct device *dev, const char *string)
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}
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EXPORT_SYMBOL_GPL(phy_get);
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/**
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* phy_optional_get() - lookup and obtain a reference to an optional phy.
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* @dev: device that requests this phy
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* @string: the phy name as given in the dt data or the name of the controller
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* port for non-dt case
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*
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* Returns the phy driver, after getting a refcount to it; or
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* NULL if there is no such phy. The caller is responsible for
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* calling phy_put() to release that count.
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*/
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struct phy *phy_optional_get(struct device *dev, const char *string)
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{
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struct phy *phy = phy_get(dev, string);
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if (PTR_ERR(phy) == -ENODEV)
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phy = NULL;
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return phy;
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}
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EXPORT_SYMBOL_GPL(phy_optional_get);
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/**
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* devm_phy_get() - lookup and obtain a reference to a phy.
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* @dev: device that requests this phy
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@ -455,6 +476,30 @@ struct phy *devm_phy_get(struct device *dev, const char *string)
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}
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EXPORT_SYMBOL_GPL(devm_phy_get);
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/**
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* devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
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* @dev: device that requests this phy
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* @string: the phy name as given in the dt data or phy device name
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* for non-dt case
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*
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* Gets the phy using phy_get(), and associates a device with it using
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* devres. On driver detach, release function is invoked on the devres
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* data, then, devres data is freed. This differs to devm_phy_get() in
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* that if the phy does not exist, it is not considered an error and
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* -ENODEV will not be returned. Instead the NULL phy is returned,
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* which can be passed to all other phy consumer calls.
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*/
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struct phy *devm_phy_optional_get(struct device *dev, const char *string)
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{
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struct phy *phy = devm_phy_get(dev, string);
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if (PTR_ERR(phy) == -ENODEV)
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phy = NULL;
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return phy;
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}
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EXPORT_SYMBOL_GPL(devm_phy_optional_get);
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/**
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* phy_create() - create a new phy
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* @dev: device that is creating the new phy
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@ -146,7 +146,9 @@ static inline void phy_set_bus_width(struct phy *phy, int bus_width)
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phy->attrs.bus_width = bus_width;
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}
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struct phy *phy_get(struct device *dev, const char *string);
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struct phy *phy_optional_get(struct device *dev, const char *string);
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struct phy *devm_phy_get(struct device *dev, const char *string);
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struct phy *devm_phy_optional_get(struct device *dev, const char *string);
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void phy_put(struct phy *phy);
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void devm_phy_put(struct device *dev, struct phy *phy);
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struct phy *of_phy_simple_xlate(struct device *dev,
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@ -232,11 +234,23 @@ static inline struct phy *phy_get(struct device *dev, const char *string)
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return ERR_PTR(-ENOSYS);
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}
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static inline struct phy *phy_optional_get(struct device *dev,
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const char *string)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct phy *devm_phy_get(struct device *dev, const char *string)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct phy *devm_phy_optional_get(struct device *dev,
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const char *string)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline void phy_put(struct phy *phy)
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{
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}
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