linux-kernel - [PATCH] net: phy: at803x: Request 'reset' GPIO only for AT8030 PHY

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Message-ID: <56F274A5.6030502@laposte.net>
Date:	Wed, 23 Mar 2016 11:49:09 +0100
From:	Sebastian Frias <sf84@...oste.net>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	Daniel Mack <daniel@...que.org>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>, mason <slash.tmp@...e.fr>,
	Florian Fainelli <f.fainelli@...il.com>,
	Mans Rullgard <mans@...sr.com>,
	Fabio Estevam <festevam@...il.com>,
	Martin Blumenstingl <martin.blumenstingl@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] net: phy: at803x: Request 'reset' GPIO only for AT8030 PHY

This removes the dependency on GPIOLIB for non faulty PHYs.

Indeed, without this patch, if GPIOLIB is not selected
devm_gpiod_get_optional() will return -ENOSYS and the driver probe
call will fail, regardless of the actual PHY hardware.

Out of the 3 PHYs supported by this driver (AT8030, AT8031, AT8035),
only AT8030 presents the issues that commit 13a56b449325 ("net: phy:
at803x: Add support for hardware reset") attempts to work-around by
using a 'reset' GPIO line.

Hence, only AT8030 should depend on GPIOLIB operating properly.

Fixes: 13a56b449325 ("net: phy: at803x: Add support for hardware reset")

Signed-off-by: Sebastian Frias <sf84@...oste.net>
---
 drivers/net/phy/at803x.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 2174ec9..dcecf25 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -251,12 +251,16 @@ static int at803x_probe(struct phy_device *phydev)
 	if (!priv)
 		return -ENOMEM;

+	if (phydev->drv->phy_id != ATH8030_PHY_ID)
+		goto does_not_require_reset_workaround;
+
 	gpiod_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 	if (IS_ERR(gpiod_reset))
 		return PTR_ERR(gpiod_reset);

 	priv->gpiod_reset = gpiod_reset;

+does_not_require_reset_workaround:
 	phydev->priv = priv;

 	return 0;
-- 
2.1.4