[PATCH v3 3/3] ethernet: stmmac: dwmac-rk: Make the phy clock could be used for external phy

[Kever Yang]

From: David Wu <david.wu at rock-chips.com>

Use the phy_clk to prepare_enable and unprepare_disable related phy clock.

Signed-off-by: David Wu <david.wu at rock-chips.com>
Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
---

Changes in v3:
- Update the code logic for backwards compatible;

Changes in v2: None

 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 82174054644a..b237771f687a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -1784,12 +1784,17 @@ static int rk_gmac_clk_init(struct plat_stmmacenet_data *plat)
 		clk_set_rate(bsp_priv->clk_mac, 50000000);
 	}
 
-	if (plat->phy_node && bsp_priv->integrated_phy) {
+	if (plat->phy_node) {
 		bsp_priv->clk_phy = of_clk_get(plat->phy_node, 0);
-		ret = PTR_ERR_OR_ZERO(bsp_priv->clk_phy);
-		if (ret)
-			return dev_err_probe(dev, ret, "Cannot get PHY clock\n");
-		clk_set_rate(bsp_priv->clk_phy, 50000000);
+		/* If it is not integrated_phy, clk_phy is optional */
+		if (bsp_priv->integrated_phy) {
+			if (IS_ERR(bsp_priv->clk_phy)) {
+				ret = PTR_ERR(bsp_priv->clk_phy);
+				dev_err(dev, "Cannot get PHY clock: %d\n", ret);
+				return -EINVAL;
+			}
+			clk_set_rate(bsp_priv->clk_phy, 50000000);
+		}
 	}
 
 	return 0;
-- 
2.25.1