Set RMII reference clock output to enabled (1) by default for VSC8541 PHY in RMII mode. The RMII specification requires a 50MHz reference clock, and many board designs expect the PHY to provide this clock to the MAC controller.
Previously, the driver defaulted rmii_clk_out to 0 (disabled) for all interface modes, which caused the PHY to not output the required 50MHz clock. This resulted in MAC-PHY communication failures and prevented network operations like DHCP from working on RMII-configured boards. This change alligns with the hardware power-up default behavior and aligns with both the generic PHY driver and Linux MSCC PHY driver implementations. Signed-off-by: Pranav Tilak <[email protected]> --- drivers/net/phy/mscc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c index bd9cd952975..e93996e277c 100644 --- a/drivers/net/phy/mscc.c +++ b/drivers/net/phy/mscc.c @@ -1385,7 +1385,7 @@ static int vsc8541_config(struct phy_device *phydev) return -EINVAL; } /* Default RMII Clk Output to 0=OFF/1=ON */ - rmii_clk_out = 0; + rmii_clk_out = 1; retval = vsc8531_vsc8541_clk_skew_config(phydev); if (retval != 0) -- 2.34.1
