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phy: core: Add consumer device link support

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In order to enforce suspend/resume ordering, this commit creates link
between phy consumers and phy devices. This link avoids to suspend phy
before phy consumers.

Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
[jonathanh@nvidia.com: Fix an abort when of_phy_get() returns error]
Signed-off-by: Jonathan Hunter <jonathanh@nvidia.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Alexandre Torgue 2019-11-04 15:37:13 +01:00 committed by Kishon Vijay Abraham I
parent 24dbe0aaa0
commit 987351e1ea
4 changed files with 53 additions and 9 deletions
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49
drivers/phy/phy-core.c
View File

@ -29,7 +29,7 @@ static void devm_phy_release(struct device *dev, void *res)
{
struct phy *phy = *(struct phy **)res;
phy_put(phy);
phy_put(dev, phy);
}
static void devm_phy_provider_release(struct device *dev, void *res)
@ -566,12 +566,12 @@ struct phy *of_phy_get(struct device_node *np, const char *con_id)
EXPORT_SYMBOL_GPL(of_phy_get);
/**
* phy_put() - release the PHY
* @phy: the phy returned by phy_get()
* of_phy_put() - release the PHY
* @phy: the phy returned by of_phy_get()
*
* Releases a refcount the caller received from phy_get().
* Releases a refcount the caller received from of_phy_get().
*/
void phy_put(struct phy *phy)
void of_phy_put(struct phy *phy)
{
if (!phy || IS_ERR(phy))
return;
@ -584,6 +584,20 @@ void phy_put(struct phy *phy)
module_put(phy->ops->owner);
put_device(&phy->dev);
}
EXPORT_SYMBOL_GPL(of_phy_put);
/**
* phy_put() - release the PHY
* @dev: device that wants to release this phy
* @phy: the phy returned by phy_get()
*
* Releases a refcount the caller received from phy_get().
*/
void phy_put(struct device *dev, struct phy *phy)
{
device_link_remove(dev, &phy->dev);
of_phy_put(phy);
}
EXPORT_SYMBOL_GPL(phy_put);
/**
@ -651,6 +665,7 @@ struct phy *phy_get(struct device *dev, const char *string)
{
int index = 0;
struct phy *phy;
struct device_link *link;
if (string == NULL) {
dev_WARN(dev, "missing string\n");
@ -672,6 +687,13 @@ struct phy *phy_get(struct device *dev, const char *string)
get_device(&phy->dev);
link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
if (!link) {
dev_err(dev, "failed to create device link to %s\n",
dev_name(phy->dev.parent));
return ERR_PTR(-EINVAL);
}
return phy;
}
EXPORT_SYMBOL_GPL(phy_get);
@ -765,6 +787,7 @@ struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
const char *con_id)
{
struct phy **ptr, *phy;
struct device_link *link;
ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
@ -776,6 +799,14 @@ struct phy *devm_of_phy_get(struct device *dev, struct device_node *np,
devres_add(dev, ptr);
} else {
devres_free(ptr);
return phy;
}
link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
if (!link) {
dev_err(dev, "failed to create device link to %s\n",
dev_name(phy->dev.parent));
return ERR_PTR(-EINVAL);
}
return phy;
@ -798,6 +829,7 @@ struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
int index)
{
struct phy **ptr, *phy;
struct device_link *link;
ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
@ -819,6 +851,13 @@ struct phy *devm_of_phy_get_by_index(struct device *dev, struct device_node *np,
*ptr = phy;
devres_add(dev, ptr);
link = device_link_add(dev, &phy->dev, DL_FLAG_STATELESS);
if (!link) {
dev_err(dev, "failed to create device link to %s\n",
dev_name(phy->dev.parent));
return ERR_PTR(-EINVAL);
}
return phy;
}
EXPORT_SYMBOL_GPL(devm_of_phy_get_by_index);

2
drivers/usb/renesas_usbhs/rcar2.c
View File

@ -34,7 +34,7 @@ static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
if (priv->phy) {
phy_put(priv->phy);
phy_put(&pdev->dev, priv->phy);
priv->phy = NULL;
}

2
drivers/usb/renesas_usbhs/rza2.c
View File

@ -29,7 +29,7 @@ static int usbhs_rza2_hardware_exit(struct platform_device *pdev)
{
struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
phy_put(priv->phy);
phy_put(&pdev->dev, priv->phy);
priv->phy = NULL;
return 0;

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

@ -234,7 +234,8 @@ struct phy *devm_of_phy_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 phy_put(struct phy *phy);
void of_phy_put(struct phy *phy);
void phy_put(struct device *dev, struct phy *phy);
void devm_phy_put(struct device *dev, struct phy *phy);
struct phy *of_phy_get(struct device_node *np, const char *con_id);
struct phy *of_phy_simple_xlate(struct device *dev,
@ -419,7 +420,11 @@ static inline struct phy *devm_of_phy_get_by_index(struct device *dev,
return ERR_PTR(-ENOSYS);
}
static inline void phy_put(struct phy *phy)
static inline void of_phy_put(struct phy *phy)
{
}
static inline void phy_put(struct device *dev, struct phy *phy)
{
}