phy: add phy_get_bus_width()/phy_set_bus_width() calls

This adds a pair of APIs that allows the generic PHY subsystem to
provide information on the PHY bus width. The PHY provider driver may
use phy_set_bus_width() to set the bus width that the PHY supports.
The controller driver may then use phy_get_bus_width() to fetch the
PHY bus width in order to properly configure the controller.

Signed-off-by: Matt Porter <mporter@linaro.org>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 6d722695e0276fb825bd6cc3731241b5d9a499c6..e273e5ac19c9ca068825aa27fc01eca365a3f248 100644 (file)
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -37,6 +37,14 @@ struct phy_ops {
        struct module *owner;
 };
 
+/**
+ * struct phy_attrs - represents phy attributes
+ * @bus_width: Data path width implemented by PHY
+ */
+struct phy_attrs {
+       u32                     bus_width;
+};
+
 /**
  * struct phy - represents the phy device
  * @dev: phy device
@@ -46,6 +54,7 @@ struct phy_ops {
  * @mutex: mutex to protect phy_ops
  * @init_count: used to protect when the PHY is used by multiple consumers
  * @power_count: used to protect when the PHY is used by multiple consumers
+ * @phy_attrs: used to specify PHY specific attributes
  */
 struct phy {
        struct device           dev;
@@ -55,6 +64,7 @@ struct phy {
        struct mutex            mutex;
        int                     init_count;
        int                     power_count;
+       struct phy_attrs        attrs;
 };
 
 /**
@@ -127,6 +137,14 @@ 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);
+static inline int phy_get_bus_width(struct phy *phy)
+{
+       return phy->attrs.bus_width;
+}
+static inline void phy_set_bus_width(struct phy *phy, int bus_width)
+{
+       phy->attrs.bus_width = bus_width;
+}
 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 +217,16 @@ static inline int phy_power_off(struct phy *phy)
        return -ENOSYS;
 }
 
+static inline int phy_get_bus_width(struct phy *phy)
+{
+       return -ENOSYS;
+}
+
+static inline void phy_set_bus_width(struct phy *phy, int bus_width)
+{
+       return;
+}
+
 static inline struct phy *phy_get(struct device *dev, const char *string)
 {
        return ERR_PTR(-ENOSYS);