[PATCH 21/31] net: davinci_mdio: Use fallback clock rate

[Sascha Hauer <s.hauer@pengutronix.de>]

On AM62L There is a clock attached to the mdio block, but the TF-A
returns 0 for its rate. Use 256MHz as fallback rate when we don't find a
valid clock rate.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/net/davinci_mdio.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/davinci_mdio.c b/drivers/net/davinci_mdio.c
index 1186642e1337b603f541f6bdf19ac2d2792f4994..ca7cecd2c08488cfa7a12d9cf8947e27722b916c 100644
--- a/drivers/net/davinci_mdio.c
+++ b/drivers/net/davinci_mdio.c
@@ -112,17 +112,18 @@ static int cpsw_mdio_write(struct mii_bus *bus, int phy_id, int phy_reg, u16 val
 
 static void cpsw_mdio_init_clk(struct cpsw_mdio_priv *priv)
 {
-	u32 mdio_in, clk_div;
+	u32 mdio_in = 0, clk_div;
 	u32 bus_freq = 1000000;
 
 	of_property_read_u32(priv->dev->of_node, "bus_freq", &bus_freq);
 
 	priv->clk = clk_get_enabled(priv->dev, "fck");
-	if (IS_ERR(priv->clk))
-		mdio_in = 256000000;
-	else
+	if (!IS_ERR(priv->clk))
 		mdio_in = clk_get_rate(priv->clk);
 
+	if (mdio_in == 0)
+		mdio_in = 256000000;
+
 	clk_div = (mdio_in / bus_freq) - 1;
 	if (clk_div > CONTROL_MAX_DIV)
 		clk_div = CONTROL_MAX_DIV;

-- 
2.39.5