Merge branch 'xilinx-clock-support'

Vineeth Karumanchi says:

====================
net: xilinx_gmii2rgmii: Add clock support

Add input clock support to gmii_to_rgmii IP.
Add "clocks" bindings for the input clock.

Changes in v3:
- Added items constraints.

Changes in v2:
- removed "clkin" clock name property.
v2 link : https://lore.kernel.org/netdev/20240517054745.4111922-1-vineeth.karumanchi@amd.com/

v1 link : https://lore.kernel.org/netdev/20240515094645.3691877-1-vineeth.karumanchi@amd.com/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/xlnx,gmii-to-rgmii.yaml

@@ -31,6 +31,10 @@ properties:
   phy-handle:
     $ref: ethernet-controller.yaml#/properties/phy-handle
 
+  clocks:
+    items:
+      - description: 200/375 MHz free-running clock is used as input clock.
+
 required:
   - compatible
   - reg
@@ -51,5 +55,6 @@ examples:
             compatible = "xlnx,gmii-to-rgmii-1.0";
             reg = <8>;
             phy-handle = <&phy>;
+            clocks = <&dummy>;
         };
     };

drivers/net/phy/xilinx_gmii2rgmii.c

@@ -15,6 +15,7 @@
 #include <linux/mii.h>
 #include <linux/mdio.h>
 #include <linux/phy.h>
+#include <linux/clk.h>
 #include <linux/of_mdio.h>
 
 #define XILINX_GMII2RGMII_REG		0x10
@@ -85,11 +86,17 @@ static int xgmiitorgmii_probe(struct mdio_device *mdiodev)
 	struct device *dev = &mdiodev->dev;
 	struct device_node *np = dev->of_node, *phy_node;
 	struct gmii2rgmii *priv;
+	struct clk *clkin;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
+	clkin = devm_clk_get_optional_enabled(dev, NULL);
+	if (IS_ERR(clkin))
+		return dev_err_probe(dev, PTR_ERR(clkin),
+					"Failed to get and enable clock from Device Tree\n");
+
 	phy_node = of_parse_phandle(np, "phy-handle", 0);
 	if (!phy_node) {
 		dev_err(dev, "Couldn't parse phy-handle\n");