ARM: i.MX6: add ethernet phy fixup for AR8031

The AR8031 is used on the i.MX6 based sabreSD, sabreauto and wandboard.
All need the same fixup, so add it for all i.MX6.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 7f238465765f..57f350cd66b4 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -115,6 +115,29 @@ static int ksz9021rn_phy_fixup(struct phy_device *phydev)
         return 0;
 }
 
+static int ar8031_phy_fixup(struct phy_device *dev)
+{
+        u16 val;
+
+        /* To enable AR8031 output a 125MHz clk from CLK_25M */
+        phy_write(dev, 0xd, 0x7);
+        phy_write(dev, 0xe, 0x8016);
+        phy_write(dev, 0xd, 0x4007);
+
+        val = phy_read(dev, 0xe);
+        val &= 0xffe3;
+        val |= 0x18;
+        phy_write(dev, 0xe, val);
+
+        /* introduce tx clock delay */
+        phy_write(dev, 0x1d, 0x5);
+        val = phy_read(dev, 0x1e);
+        val |= 0x0100;
+        phy_write(dev, 0x1e, val);
+
+        return 0;
+}
+
 static void __init imx6q_sabrelite_cko1_setup(void)
 {
         struct clk *cko1_sel, *ahb, *cko1;
@@ -139,11 +162,15 @@ put_clk:
                 clk_put(cko1);
 }
 
+#define PHY_ID_AR8031   0x004dd074
+
 static void __init imx6q_enet_phy_init(void)
 {
         if (IS_BUILTIN(CONFIG_PHYLIB)) {
                 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
                                 ksz9021rn_phy_fixup);
+                phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
+                                ar8031_phy_fixup);
         }
 }