linux-kernel - [PATCH v1] phy: Add max_link_rate as a PHY attribute along with get/set APIs

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Date:   Sat, 25 Apr 2020 06:39:20 +0200
From:   Yuti Amonkar <yamonkar@...ence.com>
To:     <linux-kernel@...r.kernel.org>, <kishon@...com>,
        <mark.rutland@....com>, <maxime@...no.tech>
CC:     <jsarha@...com>, <tomi.valkeinen@...com>, <praneeth@...com>,
        <mparab@...ence.com>, <sjakhade@...ence.com>,
        <yamonkar@...ence.com>
Subject: [PATCH v1] phy: Add max_link_rate as a PHY attribute along with get/set APIs

The patch adds a pair of APIs that allow the generic PHY subsystem to
provide information on the maximum value of link rate supported by the
PHY. The PHY provider driver may use phy_set_max_link_rate() to set the
maximum link rate that the PHY supports. The controller driver may then
use phy_get_max_link_rate() to fetch the PHY link rate in order to
properly configure the controller.

Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
---
 include/linux/phy/phy.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index bcee8eba62b3..a8b7b4a2b8de 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -119,6 +119,7 @@ struct phy_ops {
  */
 struct phy_attrs {
 	u32			bus_width;
+	u32			max_link_rate;
 	enum phy_mode		mode;
 };
 
@@ -231,6 +232,16 @@ static inline void phy_set_bus_width(struct phy *phy, int bus_width)
 {
 	phy->attrs.bus_width = bus_width;
 }
+
+static inline int phy_get_max_link_rate(struct phy *phy)
+{
+	return phy->attrs.max_link_rate;
+}
+
+static inline void phy_set_max_link_rate(struct phy *phy, int link_rate)
+{
+	phy->attrs.max_link_rate = link_rate;
+}
 struct phy *phy_get(struct device *dev, const char *string);
 struct phy *phy_optional_get(struct device *dev, const char *string);
 struct phy *devm_phy_get(struct device *dev, const char *string);
@@ -389,6 +400,16 @@ static inline void phy_set_bus_width(struct phy *phy, int bus_width)
 	return;
 }
 
+static inline int phy_get_max_link_rate(struct phy *phy)
+{
+	return -ENOSYS;
+}
+
+static inline void phy_set_max_link_rate(struct phy *phy, int link_rate)
+{
+	return;
+}
+
 static inline struct phy *phy_get(struct device *dev, const char *string)
 {
 	return ERR_PTR(-ENOSYS);
-- 
2.26.1