From ea006f68522d82b294094fd29585b16290758d29 Mon Sep 17 00:00:00 2001
From: Alan Yiding Wang <y2366wan@uwaterloo.ca>
Date: Sat, 3 Dec 2016 23:22:02 -0500
Subject: [PATCH] BCM270X_DT: Add overlay for enc28j60 on SPI2

Works on SPI2 for compute module
---
 arch/arm/boot/dts/overlays/Makefile                |  1 +
 arch/arm/boot/dts/overlays/README                  | 10 ++++-
 .../boot/dts/overlays/enc28j60-spi2-overlay.dts    | 47 ++++++++++++++++++++++
 3 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/boot/dts/overlays/enc28j60-spi2-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -28,6 +28,7 @@ dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += enc28j60.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += enc28j60-spi2.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += gpio-ir.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += gpio-poweroff.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += hifiberry-amp.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -344,12 +344,20 @@ Params: dr_mode                 Dual rol
 
 
 Name:   enc28j60
-Info:   Overlay for the Microchip ENC28J60 Ethernet Controller (SPI)
+Info:   Overlay for the Microchip ENC28J60 Ethernet Controller on SPI0
 Load:   dtoverlay=enc28j60,<param>=<val>
 Params: int_pin                 GPIO used for INT (default 25)
 
         speed                   SPI bus speed (default 12000000)
 
+
+Name:   enc28j60-spi2
+Info:   Overlay for the Microchip ENC28J60 Ethernet Controller on SPI2
+Load:   dtoverlay=enc28j60-spi2,<param>=<val>
+Params: int_pin                 GPIO used for INT (default 39)
+
+        speed                   SPI bus speed (default 12000000)
+
 
 Name:   gpio-ir
 Info:   Use GPIO pin as rc-core style infrared receiver input. The rc-core-
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/enc28j60-spi2-overlay.dts
@@ -0,0 +1,47 @@
+// Overlay for the Microchip ENC28J60 Ethernet Controller - SPI2 Compute Module
+// Interrupt pin: 39
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&spi2>;
+		__overlay__ {
+			/* needed to avoid dtc warning */
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			eth1: enc28j60@0{
+				compatible = "microchip,enc28j60";
+				reg = <0>; /* CE0 */
+				pinctrl-names = "default";
+				pinctrl-0 = <&eth1_pins>;
+				interrupt-parent = <&gpio>;
+				interrupts = <39 0x2>; /* falling edge */
+				spi-max-frequency = <12000000>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&gpio>;
+		__overlay__ {
+			eth1_pins: eth1_pins {
+				brcm,pins = <39>;
+				brcm,function = <0>; /* in */
+				brcm,pull = <0>; /* none */
+			};
+		};
+	};
+
+	__overrides__ {
+		int_pin = <&eth1>, "interrupts:0",
+		          <&eth1_pins>, "brcm,pins:0";
+		speed   = <&eth1>, "spi-max-frequency:0";
+	};
+};
