[U-Boot] [PATCH 3/3] net: sun8i_emac: Drop redundant and incorrect setting of syscon register

[Chen-Yu Tsai]

In sun8i_emac_board_setup, the driver partially configures the syscon
register for H3 EPHY. However, the settings are incomplete, and
completely unusable. The correct settings are later set in
sun8i_emac_set_syscon, but the incorrect CLK_SEL setting persists.

It is incorrect to use CLK_SEL to select 25 MHz, as the SoC does not
have a 25 MHz clock the EPHY can use.

This patch removes the setting of the syscon register in board_setup,
and also moves set_syscon above mdio_init. While mdio_init does not
access the PHY, it is better to have the PHY parameters setup before
the MDIO bus is registered.

Fixes: a29710c525ff ("net: Add EMAC driver for H3/A83T/A64 SoCs.")
Signed-off-by: Chen-Yu Tsai <wens at csie.org>
---
 drivers/net/sun8i_emac.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index 508fbfea1977..7c088c311d1d 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -22,10 +22,6 @@
 #include <miiphy.h>
 #include <net.h>
 
-#define SCTL_EMAC_TX_CLK_SRC_MII	BIT(0)
-#define SCTL_EMAC_EPIT_MII		BIT(2)
-#define SCTL_EMAC_CLK_SEL		BIT(18) /* 25 Mhz */
-
 #define MDIO_CMD_MII_BUSY		BIT(0)
 #define MDIO_CMD_MII_WRITE		BIT(1)
 
@@ -589,9 +585,6 @@ static void sun8i_emac_board_setup(struct emac_eth_dev *priv)
 		/* Set clock gating for ephy */
 		setbits_le32(&ccm->bus_gate4, BIT(AHB_GATE_OFFSET_EPHY));
 
-		/* Set Tx clock source as MII with rate 25 MZ */
-		setbits_le32(priv->sysctl_reg, SCTL_EMAC_TX_CLK_SRC_MII |
-				SCTL_EMAC_EPIT_MII | SCTL_EMAC_CLK_SEL);
 		/* Deassert EPHY */
 		setbits_le32(&ccm->ahb_reset2_cfg, BIT(AHB_RESET_OFFSET_EPHY));
 	}
@@ -693,12 +686,11 @@ static int sun8i_emac_eth_probe(struct udevice *dev)
 	priv->mac_reg = (void *)pdata->iobase;
 
 	sun8i_emac_board_setup(priv);
+	sun8i_emac_set_syscon(priv);
 
 	sun8i_mdio_init(dev->name, priv);
 	priv->bus = miiphy_get_dev_by_name(dev->name);
 
-	sun8i_emac_set_syscon(priv);
-
 	return sun8i_phy_init(priv, dev);
 }
 
-- 
2.8.1