net: phy: Add new read ethernet phy id function

Add new function to get ethernet phy id from compatible property
of the mdio phy node.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Link: https://lore.kernel.org/r/16019efb3820a50330935fdaae191cec1f101b5c.1645627539.git.michal.simek@xilinx.com

diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 709bea2..8042847 100644 (file)
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -898,6 +898,42 @@ int ofnode_read_pci_vendev(ofnode node, u16 *vendor, u16 *device)
        return -ENOENT;
 }
 
+int ofnode_read_eth_phy_id(ofnode node, u16 *vendor, u16 *device)
+{
+       const char *list, *end;
+       int len;
+
+       list = ofnode_get_property(node, "compatible", &len);
+
+       if (!list)
+               return -ENOENT;
+
+       end = list + len;
+       while (list < end) {
+               len = strlen(list);
+
+               if (len >= strlen("ethernet-phy-idVVVV,DDDD")) {
+                       char *s = strstr(list, "ethernet-phy-id");
+
+                       /*
+                        * check if the string is something like
+                        * ethernet-phy-idVVVV,DDDD
+                        */
+                       if (s && s[19] == '.') {
+                               s += strlen("ethernet-phy-id");
+                               *vendor = simple_strtol(s, NULL, 16);
+                               s += 5;
+                               *device = simple_strtol(s, NULL, 16);
+
+                               return 0;
+                       }
+               }
+               list += (len + 1);
+       }
+
+       return -ENOENT;
+}
+
 int ofnode_read_addr_cells(ofnode node)
 {
        if (ofnode_is_np(node)) {

diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 0cb324c..744dffe 100644 (file)
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -895,6 +895,19 @@ int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
 int ofnode_read_pci_vendev(ofnode node, u16 *vendor, u16 *device);
 
 /**
+ * ofnode_read_eth_phy_id() - look up eth phy vendor and device id
+ *
+ * Look at the compatible property of a device node that represents a eth phy
+ * device and extract phy vendor id and device id from it.
+ *
+ * @param node         node to examine
+ * @param vendor       vendor id of the eth phy device
+ * @param device       device id of the eth phy device
+ * @return 0 if ok, negative on error
+ */
+int ofnode_read_eth_phy_id(ofnode node, u16 *vendor, u16 *device);
+
+/**
  * ofnode_read_addr_cells() - Get the number of address cells for a node
  *
  * This walks back up the tree to find the closest #address-cells property