MLK-12065 ARM: imx: imx7d: enable enet mdio open drain

The management data input/output (MDIO) bus where often high-speed,
open-drain operation is required. i.MX7D TO1.0 ENET MDIO pin has no
open drain as IC ticket number: TKT252980, i.MX7D TO1.1 fix the issue.

Signed-off-by: Fugang Duan <B38611@freescale.com>
(cherry picked from commit: a747abd5f01d278b91d1b6ee6628e1935cb7b23c)

Conflicts:
	arch/arm/mach-imx/mach-imx7d.c

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/mach-imx7d.c b/arch/arm/mach-imx/mach-imx7d.c
index 3b9796aabcbd..8a4e893ae601 100644
--- a/arch/arm/mach-imx/mach-imx7d.c
+++ b/arch/arm/mach-imx/mach-imx7d.c
@@ -68,6 +68,23 @@ static void __init imx7d_enet_phy_init(void)
 	}
 }
 
+static void __init imx7d_enet_mdio_fixup(void)
+{
+	struct regmap *gpr;
+
+	/* The management data input/output (MDIO) bus where often high-speed,
+	 * open-drain operation is required. i.MX7D TO1.0 ENET MDIO pin has no
+	 * open drain as IC ticket number: TKT252980, i.MX7D TO1.1 fix the issue.
+	 * GPR1[8:7] are reserved bits at TO1.0, there no need to add version check.
+	 */
+	gpr = syscon_regmap_lookup_by_compatible("fsl,imx7d-iomuxc-gpr");
+	if (!IS_ERR(gpr))
+		regmap_update_bits(gpr, IOMUXC_GPR0, IMX7D_GPR0_ENET_MDIO_OPEN_DRAIN_MASK,
+				   IMX7D_GPR0_ENET_MDIO_OPEN_DRAIN_MASK);
+	else
+		pr_err("failed to find fsl,imx7d-iomux-gpr regmap\n");
+}
+
 static void __init imx7d_enet_clk_sel(void)
 {
 	struct regmap *gpr;
@@ -84,6 +101,7 @@ static void __init imx7d_enet_clk_sel(void)
 static inline void imx7d_enet_init(void)
 {
 	imx6_enet_mac_init("fsl,imx7d-fec", "fsl,imx7d-ocotp");
+	imx7d_enet_mdio_fixup();
 	imx7d_enet_phy_init();
 	imx7d_enet_clk_sel();
 }