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drivers: phy: Add support for optional phys

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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>
This commit is contained in:
Andrew Lunn
2014-02-04 18:33:12 +01:00
committed by Jason Cooper
vanhempi 04c2facad8
commit 788a4d56ff
3 muutettua tiedostoa jossa 71 lisäystä ja 6 poistoa
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18
Documentation/phy.txt
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@@ -75,14 +75,20 @@ Before the controller can make use of the PHY, it has to get a reference to
it. This framework provides the following APIs to get a reference to the PHY.
struct phy *phy_get(struct device *dev, const char *string);
struct phy *phy_optional_get(struct device *dev, const char *string);
struct phy *devm_phy_get(struct device *dev, const char *string);
struct phy *devm_phy_optional_get(struct device *dev, const char *string);
phy_get and devm_phy_get can be used to get the PHY. In the case of dt boot,
the string arguments should contain the phy name as given in the dt data and
in the case of non-dt boot, it should contain the label of the PHY.
The only difference between the two APIs is that devm_phy_get associates the
device with the PHY using devres on successful PHY get. On driver detach,
release function is invoked on the the devres data and devres data is freed.
phy_get, phy_optional_get, devm_phy_get and devm_phy_optional_get can
be used to get the PHY. In the case of dt boot, the string arguments
should contain the phy name as given in the dt data and in the case of
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 the devres data and devres data is freed. phy_optional_get and
devm_phy_optional_get should be used when the phy is optional. These
two functions will never return -ENODEV, but instead returns NULL when
the phy cannot be found.
It should be noted that NULL is a valid phy reference. All phy
consumer calls on the NULL phy become NOPs. That is the release calls,