[net-next,PATCH 1/2] net: stmmac: dwmac-stm32: Add test to verify if ETHCK is used before checking clk rate

[Christophe Roullier]

When we want to use clock from RCC to clock Ethernet PHY (with ETHCK)
we need to check if value of clock rate is authorized but we must add
test before to check if ETHCK is used.

Fixes: 582ac134963e ("net: stmmac: dwmac-stm32: Separate out external clock rate validation")

Signed-off-by: Christophe Roullier <christophe.roullier at foss.st.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index b2db0e26c4e4..8b85265ca6cf 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -195,6 +195,9 @@ static int stm32mp1_validate_ethck_rate(struct plat_stmmacenet_data *plat_dat)
 	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
 	const u32 clk_rate = clk_get_rate(dwmac->clk_eth_ck);
 
+	if (!dwmac->enable_eth_ck)
+		return 0;
+
 	switch (plat_dat->mac_interface) {
 	case PHY_INTERFACE_MODE_MII:
 	case PHY_INTERFACE_MODE_GMII:
-- 
2.25.1