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phy: Introduce of_phy_get_by_phandle 

Currently generic phy support assumes that the standard phy binding from
dts/Bindings/phy/phy-bindings.txt is used. This adds a helper function
which can be used to retrieve a phy when this standard binding is not
used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2016-09-29 11:41:14 +02:00
parent 4ed80f0643
commit 850557842f
2 changed files with 44 additions and 0 deletions
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36
drivers/phy/phy-core.c
View File

@ -267,6 +267,42 @@ struct phy *of_phy_get(struct device_node *np, const char *con_id)
return _of_phy_get(np, index);
}
/**
* of_phy_get_by_phandle() - lookup and obtain a reference to a phy.
* @dev: device that requests this phy
* @phandle - name of the property holding the phy phandle value
* @index - the index of the phy
*
* Returns the phy driver, after getting a refcount to it; or
* -ENODEV if there is no such phy. The caller is responsible for
* calling phy_put() to release that count.
*/
struct phy *of_phy_get_by_phandle(struct device_d *dev, const char *phandle,
u8 index)
{
struct device_node *np;
struct phy_provider *phy_provider;
if (!dev->device_node) {
dev_dbg(dev, "device does not have a device node entry\n");
return ERR_PTR(-EINVAL);
}
np = of_parse_phandle(dev->device_node, phandle, index);
if (!np) {
dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
dev->device_node->full_name);
return ERR_PTR(-ENODEV);
}
phy_provider = of_phy_provider_lookup(np);
if (IS_ERR(phy_provider)) {
return ERR_PTR(-ENODEV);
}
return phy_provider->of_xlate(phy_provider->dev, NULL);
}
/**
* phy_get() - lookup and obtain a reference to a phy.
* @dev: device that requests this phy

8
include/linux/phy/phy.h
View File

@ -136,6 +136,8 @@ static inline void phy_set_bus_width(struct phy *phy, int bus_width)
}
struct phy *phy_get(struct device_d *dev, const char *string);
struct phy *phy_optional_get(struct device_d *dev, const char *string);
struct phy *of_phy_get_by_phandle(struct device_d *dev, const char *phandle,
u8 index);
void phy_put(struct phy *phy);
struct phy *of_phy_get(struct device_node *np, const char *con_id);
struct phy *of_phy_simple_xlate(struct device_d *dev,
@ -198,6 +200,12 @@ static inline struct phy *phy_optional_get(struct device_d *dev,
return ERR_PTR(-ENOSYS);
}
static inline struct phy *of_phy_get_by_phandle(struct device_d *dev,
const char *phandle, u8 index)
{
return ERR_PTR(-ENOSYS);
}
static inline void phy_put(struct phy *phy)
{
}