net: stmmac: meson: document device tree bindings

Add the device tree bindings documentation for the Amlogic Meson
variant of the Synopsys DesignWare MAC.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/meson-dwmac.txt b/Documentation/devicetree/bindings/net/meson-dwmac.txt
new file mode 100644
index 000000000000..ec633d74a8a8
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/meson-dwmac.txt
@@ -0,0 +1,25 @@
+* Amlogic Meson DWMAC Ethernet controller
+
+The device inherits all the properties of the dwmac/stmmac devices
+described in the file net/stmmac.txt with the following changes.
+
+Required properties:
+
+- compatible: should be "amlogic,meson6-dwmac" along with "snps,dwmac"
+              and any applicable more detailed version number
+              described in net/stmmac.txt
+
+- reg: should contain a register range for the dwmac controller and
+       another one for the Amlogic specific configuration
+
+Example:
+
+        ethmac: ethernet@c9410000 {
+                compatible = "amlogic,meson6-dwmac", "snps,dwmac";
+                reg = <0xc9410000 0x10000
+                       0xc1108108 0x4>;
+                interrupts = <0 8 1>;
+                interrupt-names = "macirq";
+                clocks = <&clk81>;
+                clock-names = "stmmaceth";
+        }