linux-kernel - [PATCH] mdio_bus: Simplify reset handling and extend to non-DT systems

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Message-Id: <20200113130529.15372-1-geert+renesas@glider.be>
Date:   Mon, 13 Jan 2020 14:05:29 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Philipp Zabel <p.zabel@...gutronix.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] mdio_bus: Simplify reset handling and extend to non-DT systems

Convert mdiobus_register_reset() from open-coded DT-only optional reset
handling to reset_control_get_optional_exclusive().  This not only
simplifies the code, but also adds support for lookup-based resets on
non-DT systems.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Only tested on systems without PHY resets, with and without
CONFIG_RESET_CONTROLLER=y.

 drivers/net/phy/mdio_bus.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 229e480179ff1de4..8d753bb07227e561 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -59,17 +59,11 @@ static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
 
 static int mdiobus_register_reset(struct mdio_device *mdiodev)
 {
-	struct reset_control *reset = NULL;
-
-	if (mdiodev->dev.of_node)
-		reset = of_reset_control_get_exclusive(mdiodev->dev.of_node,
-						       "phy");
-	if (IS_ERR(reset)) {
-		if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) == -ENOTSUPP)
-			reset = NULL;
-		else
-			return PTR_ERR(reset);
-	}
+	struct reset_control *reset;
+
+	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
+	if (IS_ERR(reset))
+		return PTR_ERR(reset);
 
 	mdiodev->reset_ctrl = reset;
 
-- 
2.17.1