Re: [PATCH 2/2] dts: r40: add second ethernet support

R40 (aka V40, A40i, T3) has two different Ethernet IP
called EMAC and GMAC.
EMAC only support 10/100 Mbit in MII mode,
while GMAC support both 10/100 (MII) and 10/100/1000 (RGMII).

In contrast to A10/A20 where GMAC and EMAC share the same pins
making EMAC somewhat pointless, on R40 EMAC can be routed to port H.
Both EMAC (on port H) and GMAC (on port A)
 can be then enabled at the same time, allowing for two ethernet ports.

Signed-off-by: Evgeny Boger <redacted>
---
 arch/arm/boot/dts/sun8i-r40.dtsi | 53 ++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
index d5ad3b9efd12..c102c1510012 100644
--- a/arch/arm/boot/dts/sun8i-r40.dtsi
+++ b/arch/arm/boot/dts/sun8i-r40.dtsi

@@ -217,6 +217,20 @@
 			#size-cells = <1>;
 			ranges;
 
+			sram_a: sram@0 {
+				compatible = "mmio-sram";
+				reg = <0x00000000 0xc000>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges = <0 0x00000000 0xc000>;
+
+				emac_sram: sram-section@8000 {
+					compatible = "allwinner,sun4i-a10-sram-a3-a4";
+					reg = <0x8000 0x4000>;
+					status = "okay";
+				};
+			};
+
 			sram_c: sram@1d00000 {
 				compatible = "mmio-sram";
 				reg = <0x01d00000 0xd0000>;

@@ -541,6 +555,24 @@
 				drive-strength = <40>;
 			};
 
+			emac_ph_pins: emac-ph-pins {
+				pins = "PH8", "PH9", "PH10", "PH11",
+				       "PH14", "PH15", "PH16", "PH17",
+				       "PH18","PH19", "PH20", "PH21",
+				       "PH22", "PH23", "PH24", "PH25",
+				       "PH26", "PH27";
+				function = "emac";
+			};
+
+			emac_pa_pins: emac-pa-pins {
+				pins = "PA0", "PA1", "PA2",
+				       "PA3", "PA4", "PA5", "PA6",
+				       "PA7", "PA8", "PA9", "PA10",
+				       "PA11", "PA12", "PA13", "PA14",
+				       "PA15", "PA16";
+				function = "emac";
+			};
+

 			i2c0_pins: i2c0-pins {
 				pins = "PB0", "PB1";
 				function = "i2c0";

@@ -885,6 +917,27 @@
 			};
 		};
 
+		emac: ethernet@1c0b000 {
+			syscon = <&ccu>;