drivers: ethernet: ksz8081: support 25MHz RMII

Daniel Coffey · cfriedt · commit 68c6b6ca0cf9 · 2025-07-29T11:25:14.000-04:00
Configure KSZ8081 phy drivers to set strapping mode override
for RMII mode without setting reference clock to 50MHz when
"RMII 25MHz" operation is selected in device tree node.

Signed-off-by: Daniel Coffey &lt;danielcoffey@carallon.com&gt;
diff --git a/drivers/ethernet/phy/phy_microchip_ksz8081.c b/drivers/ethernet/phy/phy_microchip_ksz8081.c
@@ -236,7 +236,7 @@ static int phy_mc_ksz8081_static_cfg(const struct device *dev)
 
 	omso &= ~PHY_MC_KSZ8081_OMSO_FACTORY_MODE_MASK &
 		~PHY_MC_KSZ8081_OMSO_NAND_TREE_MASK;
-	if (config->phy_iface == KSZ8081_RMII) {
+	if (config->phy_iface == KSZ8081_RMII || config->phy_iface == KSZ8081_RMII_25MHZ) {
 		omso &= ~PHY_MC_KSZ8081_OMSO_MII_OVERRIDE_MASK;
 		omso |= PHY_MC_KSZ8081_OMSO_RMII_OVERRIDE_MASK;
 	}

Original file line number	Diff line number	Diff line change
`@@ -236,7 +236,7 @@ static int phy_mc_ksz8081_static_cfg(const struct device *dev)`
`236`	`236`
`237`	`237`	`omso &= ~PHY_MC_KSZ8081_OMSO_FACTORY_MODE_MASK &`
`238`	`238`	`~PHY_MC_KSZ8081_OMSO_NAND_TREE_MASK;`
`239`		`- if (config->phy_iface == KSZ8081_RMII) {`
	`239`	`+ if (config->phy_iface == KSZ8081_RMII \|\| config->phy_iface == KSZ8081_RMII_25MHZ) {`
`240`	`240`	`omso &= ~PHY_MC_KSZ8081_OMSO_MII_OVERRIDE_MASK;`
`241`	`241`	`omso \|= PHY_MC_KSZ8081_OMSO_RMII_OVERRIDE_MASK;`
`242`	`242`	`}`