linux-kernel - [PATCH] phy: Allow a NULL phy name for devm_phy

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Message-Id: <20210414135525.3535787-1-robh@kernel.org>
Date:   Wed, 14 Apr 2021 08:55:25 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Aswath Govindraju <a-govindraju@...com>
Subject: [PATCH] phy: Allow a NULL phy name for devm_phy_get()

For a single PHY, there's no reason to have a phy-names entry in DT.
The DT specific get functions allow for this already, but devm_phy_get()
WARNs in this case. Other subsystems also don't warn in their get
functions. Let's drop the WARN for DT case in devm_phy_get().

Cc: Kishon Vijay Abraham I <kishon@...com>
Cc: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Rob Herring <robh@...nel.org>
---
Note that I think the device_link_add later on is now redundant with 
fw_devlinks. If so, this can be simplified to just calling of_phy_get() 
for DT case.

 drivers/phy/phy-core.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 71cb10826326..3e4971253ec1 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -667,16 +667,18 @@ struct phy *phy_get(struct device *dev, const char *string)
 	struct phy *phy;
 	struct device_link *link;
 
-	if (string == NULL) {
-		dev_WARN(dev, "missing string\n");
-		return ERR_PTR(-EINVAL);
-	}
-
 	if (dev->of_node) {
-		index = of_property_match_string(dev->of_node, "phy-names",
-			string);
+		if (string)
+			index = of_property_match_string(dev->of_node, "phy-names",
+				string);
+		else
+			index = 0;
 		phy = _of_phy_get(dev->of_node, index);
 	} else {
+		if (string == NULL) {
+			dev_WARN(dev, "missing string\n");
+			return ERR_PTR(-EINVAL);
+		}
 		phy = phy_find(dev, string);
 	}
 	if (IS_ERR(phy))
-- 
2.27.0