ARM: dts: wheat: add Ethernet support

R8A7792  SoC  doesn't have the  EtherMAC core, so SMSC LAN89218 Ethernet
chip was used instead on the Wheat debug board; this chip is compatible
with SMSC LAN9115 for which  there's a (device  tree aware)  driver.
Describe the chip  in the Wheat device tree unconditionally (the driver
should fail the probe if the debug board isn't connected); enable DHCP and
NFS root in the command line for the kernel boot...

Based  on the original (and large) patch by Vladimir Barinov
<vladimir.barinov@cogentembedded.com>.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/boot/dts/r8a7792-wheat.dts b/arch/arm/boot/dts/r8a7792-wheat.dts
index 22ae14f..e214d70 100644 (file)
--- a/arch/arm/boot/dts/r8a7792-wheat.dts
+++ b/arch/arm/boot/dts/r8a7792-wheat.dts
@@ -21,7 +21,7 @@
        };
 
        chosen {
-               bootargs = "ignore_loglevel";
+               bootargs = "ignore_loglevel rw root=/dev/nfs ip=dhcp";
                stdout-path = "serial0:115200n8";
        };
 
@@ -29,6 +29,31 @@
                device_type = "memory";
                reg = <0 0x40000000 0 0x40000000>;
        };
+
+       d3_3v: regulator-3v3 {
+               compatible = "regulator-fixed";
+               regulator-name = "D3.3V";
+               regulator-min-microvolt = <3300000>;
+               regulator-max-microvolt = <3300000>;
+               regulator-boot-on;
+               regulator-always-on;
+       };
+
+       ethernet@18000000 {
+               compatible = "smsc,lan89218", "smsc,lan9115";
+               reg = <0 0x18000000 0 0x100>;
+               phy-mode = "mii";
+               interrupt-parent = <&irqc>;
+               interrupts = <0 IRQ_TYPE_EDGE_FALLING>;
+               smsc,irq-push-pull;
+               smsc,save-mac-address;
+               reg-io-width = <4>;
+               vddvario-supply = <&d3_3v>;
+               vdd33a-supply = <&d3_3v>;
+
+               pinctrl-0 = <&lan89218_pins>;
+               pinctrl-names = "default";
+       };
 };
 
 &extal_clk {
@@ -40,6 +65,17 @@
                groups = "scif0_data";
                function = "scif0";
        };
+
+       lan89218_pins: lan89218 {
+               intc {
+                       groups = "intc_irq0";
+                       function = "intc";
+               };
+               lbsc {
+                       groups = "lbsc_ex_cs0";
+                       function = "lbsc";
+               };
+       };
 };
 
 &scif0 {