From 06a21e12ee94f43eebaabad5bad60c1120d723f9 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Tue, 29 Nov 2016 17:55:41 +0100 Subject: kernel: backport some upstream at803x fixes Signed-off-by: Felix Fietkau --- ...03x-Request-reset-GPIO-only-for-AT8030-PH.patch | 42 ++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 target/linux/generic/patches-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch (limited to 'target/linux/generic/patches-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch') diff --git a/target/linux/generic/patches-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch b/target/linux/generic/patches-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch new file mode 100644 index 0000000..b30ba7a --- /dev/null +++ b/target/linux/generic/patches-4.4/737-net-phy-at803x-Request-reset-GPIO-only-for-AT8030-PH.patch @@ -0,0 +1,42 @@ +From: Sebastian Frias +Date: Wed, 23 Mar 2016 11:49:09 +0100 +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 +Signed-off-by: David S. Miller +--- + +--- a/drivers/net/phy/at803x.c ++++ b/drivers/net/phy/at803x.c +@@ -250,12 +250,16 @@ static int at803x_probe(struct phy_devic + 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; -- cgit v1.1