Re: [RFC PATCH 9/9] dt-bindings: net: dsa: Add documentation for Hellcreek switches

Hi Andrew,

On Thu Jun 18 2020, Andrew Lunn wrote:

quoted

+Ethernet switch connected memory mapped to the host, CPU port wired to gmac0:
+
+soc {
+        switch0: switch@0xff240000 {
+                compatible = "hirschmann,hellcreek";
+                status = "okay";
+                reg = <0xff240000 0x1000   /* TSN base */
+                       0xff250000 0x1000>; /* PTP base */
+                dsa,member = <0 0>;
+
+                ports {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        port@0 {
+                                reg = <0>;
+                                label = "cpu";
+                                ethernet = <&gmac0>;
+                        };
+
+                        port@2 {
+                                reg = <2>;
+                                label = "lan0";
+                                phy-handle = <&phy1>;
+                        };
+
+                        port@3 {
+                                reg = <3>;
+                                label = "lan1";
+                                phy-handle = <&phy2>;
+                        };
+                };
+        };
+};
+
+&gmac0 {
+        status = "okay";
+        phy-mode = "mii";
+
+        fixed-link {
+                speed = <100>;
+                full-duplex;

Hi Kurt

The switch is 100/100Mbps right? The MAC is only Fast ethernet. Do you
need some properties in the port@0 node to tell the switch to only use
100Mbps? I would expect it to default to 1G. Not looked at the code
yet...

No, that is not needed. That is a hardware configuration and AFAIK
cannot be changed at run time.

Thanks,
Kurt