[PATCH RFC 1/4] phy: Add provision for tuning phy.

[Vivek Gautam]

Some PHY controllers may need to tune PHY post-initialization,
so that the PHY consumers can call phy-tuning at appropriate
point of time.

Signed-off-by: vivek Gautam <gautam.vi...@samsung.com>
---
 drivers/phy/phy-core.c  |   20 ++++++++++++++++++++
 include/linux/phy/phy.h |    7 +++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 03cf8fb..68dbb90 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -239,6 +239,26 @@ out:
 }
 EXPORT_SYMBOL_GPL(phy_power_off);
 
+int phy_tune(struct phy *phy)
+{
+       int ret = -ENOTSUPP;
+
+       mutex_lock(&phy->mutex);
+       if (phy->ops->tune) {
+               ret =  phy->ops->tune(phy);
+               if (ret < 0) {
+                       dev_err(&phy->dev, "phy tuning failed --> %d\n", ret);
+                       goto out;
+               }
+       }
+
+out:
+       mutex_unlock(&phy->mutex);
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(phy_tune);
+
 /**
  * of_phy_get() - lookup and obtain a reference to a phy by phandle
  * @dev: device that requests this phy
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 6d72269..d3b32b0 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -34,6 +34,7 @@ struct phy_ops {
        int     (*exit)(struct phy *phy);
        int     (*power_on)(struct phy *phy);
        int     (*power_off)(struct phy *phy);
+       int     (*tune)(struct phy *phy);
        struct module *owner;
 };
 
@@ -127,6 +128,7 @@ int phy_init(struct phy *phy);
 int phy_exit(struct phy *phy);
 int phy_power_on(struct phy *phy);
 int phy_power_off(struct phy *phy);
+int phy_tune(struct phy *phy);
 struct phy *phy_get(struct device *dev, const char *string);
 struct phy *devm_phy_get(struct device *dev, const char *string);
 void phy_put(struct phy *phy);
@@ -199,6 +201,11 @@ static inline int phy_power_off(struct phy *phy)
        return -ENOSYS;
 }
 
+static inline int phy_tune(struct phy *phy)
+{
+       return -ENOSYS;
+}
+
 static inline struct phy *phy_get(struct device *dev, const char *string)
 {
        return ERR_PTR(-ENOSYS);
-- 
1.7.6.5

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