[PATCH v2] ARM: boards: phytec-som-imx6: Add ADIN1300 PHY fixup

[Florijan Plohl <florijan.plohl@norik.com>]

From: Stefan Riedmueller <s.riedmueller@phytec.de>

The i.MX 6 requires a ref clock from the PHY when running in RGMII mode.
Since the clock output from the GP_CLK pin is disabled by default on the
ADIN1300 PHY we need a fixup to enable it.

Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: Florijan Plohl <florijan.plohl@norik.com>
---
Changes in v2:
- Register the fixup once after the board specific if/else instead of
  in every board branch
- Link to v1: https://lore.barebox.org/barebox/20261001104232.2616094-1-florijan.plohl@norik.com/

 arch/arm/boards/phytec-som-imx6/board.c | 33 +++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boards/phytec-som-imx6/board.c b/arch/arm/boards/phytec-som-imx6/board.c
index 7e6f61bc36..031d11d816 100644
--- a/arch/arm/boards/phytec-som-imx6/board.c
+++ b/arch/arm/boards/phytec-som-imx6/board.c
@@ -45,6 +45,9 @@
 #define DA9062_BUCK4_CFG		0x9f
 #define DA9062_BUCKx_MODE_SYNCHRONOUS	(2 << 6)
 
+#define PHY_ID_ADIN1300			0x0283bc30
+#define ADIN_PHY_ID_MASK		0x0fffffff
+
 static void phyflex_err006282_workaround(void)
 {
 	/*
@@ -99,6 +102,33 @@ static int ksz8081_phy_fixup(struct phy_device *phydev)
 	return 0;
 }
 
+static int adin1300_phy_fixup(struct phy_device *phydev)
+{
+	u16 val;
+	/*
+	 * Enable 125 MHz PHY clock at GP_CLK pin to the ENET_REF_CLK pin
+	 * of the i.MX 6
+	 */
+
+	phy_write(phydev, 0x1c, 0x2109);
+	phy_write(phydev, 0x1b, 0x401);
+	phy_write(phydev, 0x10, 0xff1f);
+	phy_write(phydev, 0x11, 0x28);
+	phy_write(phydev, 0x10, 0xff3c);
+	phy_write(phydev, 0x11, 0x1);
+
+	/*
+	 * Disable advertisement of 100BASE-TX and 1000BASE-T EEE capabilities
+	 * by clearing EEE_100_ADV and EEE_1000_ADV bits in EEE_ADV (0x8001) reg.
+	 */
+	phy_write(phydev, 0x10, 0x8001);
+	val = phy_read(phydev, 0x11);
+	val &= ~(BIT(1) | BIT(2));
+	phy_write(phydev, 0x11, 0x0);
+
+	return 0;
+}
+
 static int phycore_da9062_setup_buck_mode(void)
 {
 	struct i2c_adapter *adapter = NULL;
@@ -216,6 +246,9 @@ static int physom_imx6_probe(struct device *dev)
 		return -EINVAL;
 	}
 
+	phy_register_fixup_for_uid(PHY_ID_ADIN1300, ADIN_PHY_ID_MASK,
+			adin1300_phy_fixup);
+
 	switch (bootsource_get()) {
 	case BOOTSOURCE_MMC:
 		environment_path = basprintf("/chosen/environment-sd%d",
-- 
2.43.0