[PATCH RFC 1/3] net: dt-bindings: add the amlogic, meson8b-dwmac binding

[martin.blumenstingl@googlemail.com (Martin Blumenstingl)]

This patch adds the documentation for the DWMAC ethernet controller
found in Amlogic Meson 8b (S805) and GXBB (S905) SoCs.
Compared to the standard stmmac/dwmac configuration this requires some
some additional parameters for configuring the clock-generator
depending on the actual ethernet PHY on the board.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 .../bindings/net/amlogic,meson8b-dwmac.txt         | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/amlogic,meson8b-dwmac.txt

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson8b-dwmac.txt b/Documentation/devicetree/bindings/net/amlogic,meson8b-dwmac.txt
new file mode 100644
index 0000000..4164753e
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/amlogic,meson8b-dwmac.txt
@@ -0,0 +1,44 @@
+* Amlogic Meson 8b/GXBB 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,meson8b-dwmac" along with "snps,dwmac"
+	      and any applicable more detailed version number
+	      described in net/stmmac.txt
+- prg-ethernet: should contain a phandle to a syscon device mapping the
+		PRG_ETHERNET registers.
+
+
+Optional properties:
+- amlogic,enable-tx-phy-ref-clk: Enables the TX_CLK and PHY_REF_CLK
+				 clock generator.
+- amlogic,mp2-clock: Sets the frequency for the mp2_clk_out clock. See
+		     the MESON8B_DWMAC_MP2_CLOCK_* definitions in
+		     "include/dt-bindings/net/amlogic-meson8b-dwmac.h".
+- amlogic,tx-delay: Configures the TX clock delay. See the
+		    MESON8B_DWMAC_TX_CLK_DELAY_* definitions in
+		    "include/dt-bindings/net/amlogic-meson8b-dwmac.h".
+
+
+Example:
+
+#include <dt-bindings/net/amlogic-meson8b-dwmac.h>
+
+	gmac: ethernet at 37000000 {
+		compatible = "amlogic,meson8b-dwmac", "snps,dwmac";
+		reg = <0x0 0xc9410000 0x0 0x10000>;
+		interrupts = <0 8 1>;
+		interrupt-names = "macirq";
+
+		clocks = <&clkc CLKID_ETH>;
+		clock-names = "stmmaceth";
+
+		phy-mode = "rgmii";
+		
+		amlogic,prg-ethernet = <&prg_ethernet>;
+		amlogic,enable-25mhz-phy-clk;
+		amlogic,mp2-clock = <MESON8B_DWMAC_MP2_CLOCK_1000MHZ>;
+		amlogic,tx-delay = <MESON8B_DWMAC_TX_CLK_DELAY_QUARTER_CYCLE>;
+	};
-- 
2.9.0