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authorAndrew Lunn <andrew@lunn.ch>2014-02-04 18:33:12 +0100
committerJason Cooper <jason@lakedaemon.net>2014-02-05 05:48:43 +0000
commit788a4d56ff378bff0b8e685d03a962b36903a149 (patch)
treed22d5b9e750448fb0d7695bf4c9360b326668a95 /drivers/phy
parent04c2facad8fee66c981a51852806d8923336f362 (diff)
downloadop-kernel-dev-788a4d56ff378bff0b8e685d03a962b36903a149.zip
op-kernel-dev-788a4d56ff378bff0b8e685d03a962b36903a149.tar.gz
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>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/phy-core.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index a9cdeee2..5f5b0f4 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -426,6 +426,27 @@ struct phy *phy_get(struct device *dev, const char *string)
EXPORT_SYMBOL_GPL(phy_get);
/**
+ * phy_optional_get() - lookup and obtain a reference to an optional phy.
+ * @dev: device that requests this phy
+ * @string: the phy name as given in the dt data or the name of the controller
+ * port for non-dt case
+ *
+ * Returns the phy driver, after getting a refcount to it; or
+ * NULL if there is no such phy. The caller is responsible for
+ * calling phy_put() to release that count.
+ */
+struct phy *phy_optional_get(struct device *dev, const char *string)
+{
+ struct phy *phy = phy_get(dev, string);
+
+ if (PTR_ERR(phy) == -ENODEV)
+ phy = NULL;
+
+ return phy;
+}
+EXPORT_SYMBOL_GPL(phy_optional_get);
+
+/**
* devm_phy_get() - lookup and obtain a reference to a phy.
* @dev: device that requests this phy
* @string: the phy name as given in the dt data or phy device name
@@ -456,6 +477,30 @@ struct phy *devm_phy_get(struct device *dev, const char *string)
EXPORT_SYMBOL_GPL(devm_phy_get);
/**
+ * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
+ * @dev: device that requests this phy
+ * @string: the phy name as given in the dt data or phy device name
+ * for non-dt case
+ *
+ * Gets the phy using 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_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_phy_optional_get(struct device *dev, const char *string)
+{
+ struct phy *phy = devm_phy_get(dev, string);
+
+ if (PTR_ERR(phy) == -ENODEV)
+ phy = NULL;
+
+ return phy;
+}
+EXPORT_SYMBOL_GPL(devm_phy_optional_get);
+
+/**
* phy_create() - create a new phy
* @dev: device that is creating the new phy
* @ops: function pointers for performing phy operations
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