linux-kernel - [PATCH 4.2.y-ckt 70/70] net: phy: at803x: Request 'reset' GPIO only for AT8030 PHY

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Message-Id: <1460494375-30070-71-git-send-email-kamal@canonical.com>
Date:	Tue, 12 Apr 2016 13:52:55 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sebastian Frias <sf84@...oste.net>,
	"David S . Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 70/70] net: phy: at803x: Request 'reset' GPIO only for AT8030 PHY

4.2.8-ckt8 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Sebastian Frias <sf84@...oste.net>

commit 9eb13f65c305ec6687d7666abce14e6c047fa872 upstream.

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 5fbca04..d7e39f6 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -198,12 +198,16 @@ 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_LOW);
 	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;
-- 
2.7.4