linux-kernel - [PATCH net-next v2 1/2] of: mdio: Fall back to mdiobus_register() with NULL device

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Date:   Tue, 15 May 2018 16:56:18 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Fugang Duan <fugang.duan@....com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Tobias Jordan <Tobias.Jordan@...ktrobit.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Maxim Uvarov <muvarov@...il.com>, Sekhar Nori <nsekhar@...com>,
        linux-kernel@...r.kernel.org (open list),
        linux-renesas-soc@...r.kernel.org (open list:RENESAS ETHERNET DRIVERS),
        linux-omap@...r.kernel.org (open list:TI ETHERNET SWITCH DRIVER (CPSW)),
        linux-usb@...r.kernel.org (open list:USB NETWORKING DRIVERS),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE)
Subject: [PATCH net-next v2 1/2] of: mdio: Fall back to mdiobus_register() with NULL device_node

When the device_node specified is NULL, fall back to mdiobus_register().
We have a number of drivers having a similar pattern which is:

if (np)
	of_mdiobus_register()
else
	mdiobus_register()

so incorporate that behavior within the core of_mdiobus_register()
function. This is also consistent with the stub version that we defined
when CONFIG_OF=n.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/of/of_mdio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 8c0c92712fc9..d963baf8e53a 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -204,6 +204,9 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 	bool scanphys = false;
 	int addr, rc;
 
+	if (!np)
+		return mdiobus_register(mdio);
+
 	/* Do not continue if the node is disabled */
 	if (!of_device_is_available(np))
 		return -ENODEV;
-- 
2.14.1