[U-Boot] [PATCH v3 5/6] net: phy: ar803x: Clarify the configuration of the CLK_25M output pin

[Vladimir Oltean]

Also take the opportunity to use the phy_read_mmd and phy_write_mmd
convenience functions.

Signed-off-by: Vladimir Oltean <vladimir.oltean at nxp.com>
---
Changes in v3:
 * Patch added in this version. Partially squashed with patch 1/3 from v2,
   since addressing the comments on that patch gave its commit message
   a new meaning.

 drivers/net/phy/atheros.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/atheros.c b/drivers/net/phy/atheros.c
index 02aa61f..a2d0e0d 100644
--- a/drivers/net/phy/atheros.c
+++ b/drivers/net/phy/atheros.c
@@ -18,6 +18,15 @@
 #define AR803x_DEBUG_REG_0		0x0
 #define AR803x_RGMII_RX_CLK_DLY		BIT(15)
 
+/* CLK_25M register is at MMD 7, address 0x8016 */
+#define AR803x_CLK_25M_SEL_REG		0x8016
+/* AR8035: Select frequency on CLK_25M pin through bits 4:3 */
+#define AR8035_CLK_25M_FREQ_25M		(0 | 0)
+#define AR8035_CLK_25M_FREQ_50M		(0 | BIT(3))
+#define AR8035_CLK_25M_FREQ_62M		(BIT(4) | 0)
+#define AR8035_CLK_25M_FREQ_125M	(BIT(4) | BIT(3))
+#define AR8035_CLK_25M_MASK		GENMASK(4, 3)
+
 #define AR803x_SMART_EEE_CTRL3_REG	0x805D
 #define AR803x_LPI_EN			BIT(8)
 
@@ -108,11 +117,11 @@ static int ar8035_config(struct phy_device *phydev)
 #else
 	ar803x_enable_smart_eee(phydev, false);
 #endif
-	phy_write(phydev, MDIO_DEVAD_NONE, 0xd, 0x0007);
-	phy_write(phydev, MDIO_DEVAD_NONE, 0xe, 0x8016);
-	phy_write(phydev, MDIO_DEVAD_NONE, 0xd, 0x4007);
-	regval = phy_read(phydev, MDIO_DEVAD_NONE, 0xe);
-	phy_write(phydev, MDIO_DEVAD_NONE, 0xe, (regval|0x0018));
+	/* Configure CLK_25M output clock at 125 MHz */
+	regval = phy_read_mmd(phydev, MDIO_MMD_AN, AR803x_CLK_25M_SEL_REG);
+	regval &= ~AR8035_CLK_25M_MASK; /* No surprises */
+	regval |= AR8035_CLK_25M_FREQ_125M;
+	phy_write_mmd(phydev, MDIO_MMD_AN, AR803x_CLK_25M_SEL_REG, regval);
 
 	if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) ||
 	    (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID))
-- 
2.7.4