[PATCH v2 3/5] net: phy: motorcomm: Enable optional clock for YT8531

[Yanan He]

Some boards feed the YT8531 PHY from an SoC-provided external
reference clock described by the common ethernet-phy "clocks" property.

Enable the optional PHY clock during probe so boards can model this
clock as a PHY input instead of keeping the clock alive from the MAC
driver.

This is needed on the Alientek DLRV1126, where the PHY reference clock
is provided by CLK_GMAC_ETHERNET_OUT.

Signed-off-by: Yanan He <grumpycat921013 at gmail.com>
---
 drivers/net/phy/motorcomm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
index 5071605a1a11..3396a38cfc0f 100644
--- a/drivers/net/phy/motorcomm.c
+++ b/drivers/net/phy/motorcomm.c
@@ -6,6 +6,7 @@
  * Author: Frank <Frank.Sae at motor-comm.com>
  */
 
+#include <linux/clk.h>
 #include <linux/etherdevice.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -1180,9 +1181,15 @@ static int yt8521_probe(struct phy_device *phydev)
 static int yt8531_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
+	struct clk *clk;
 	u16 mask, val;
 	u32 freq;
 
+	clk = devm_clk_get_optional_enabled(dev, NULL);
+	if (IS_ERR(clk))
+		return dev_err_probe(dev, PTR_ERR(clk),
+				     "failed to get and enable PHY clock\n");
+
 	if (device_property_read_u32(dev, "motorcomm,clk-out-frequency-hz", &freq))
 		freq = YTPHY_DTS_OUTPUT_CLK_DIS;
 

-- 
2.54.0