linux-kernel - [PATCH] phy: core: Allow phy_pm_runtime

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Date:   Fri, 16 Mar 2018 14:40:51 +0530
From:   Manu Gautam <mgautam@...eaurora.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-arm-msm@...r.kernel.org,
        Manu Gautam <mgautam@...eaurora.org>,
        linux-kernel@...r.kernel.org (open list:GENERIC PHY FRAMEWORK)
Subject: [PATCH] phy: core: Allow phy_pm_runtime_xxx API calls with NULL phy

phy_init() and phy_exit() calls, and phy_power_on() and
phy_power_off() already accept NULL as valid PHY refernece
and act as NOP. Extend same concept to phy runtime_pm APIs
to keep drivers (e.g. dwc3) code simple while dealing with
optional PHYs.

Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
---
 drivers/phy/phy-core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 09ac8af..48b9615 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -153,6 +153,9 @@ int phy_pm_runtime_get(struct phy *phy)
 {
 	int ret;
 
+	if (!phy)
+		return 0;
+
 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;
 
@@ -168,6 +171,9 @@ int phy_pm_runtime_get_sync(struct phy *phy)
 {
 	int ret;
 
+	if (!phy)
+		return 0;
+
 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;
 
@@ -181,6 +187,9 @@ int phy_pm_runtime_get_sync(struct phy *phy)
 
 int phy_pm_runtime_put(struct phy *phy)
 {
+	if (!phy)
+		return 0;
+
 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;
 
@@ -190,6 +199,9 @@ int phy_pm_runtime_put(struct phy *phy)
 
 int phy_pm_runtime_put_sync(struct phy *phy)
 {
+	if (!phy)
+		return 0;
+
 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;
 
@@ -199,6 +211,9 @@ int phy_pm_runtime_put_sync(struct phy *phy)
 
 void phy_pm_runtime_allow(struct phy *phy)
 {
+	if (!phy)
+		return 0;
+
 	if (!pm_runtime_enabled(&phy->dev))
 		return;
 
@@ -208,6 +223,9 @@ void phy_pm_runtime_allow(struct phy *phy)
 
 void phy_pm_runtime_forbid(struct phy *phy)
 {
+	if (!phy)
+		return 0;
+
 	if (!pm_runtime_enabled(&phy->dev))
 		return;
 
-- 
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