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From 298e839b5159e62739d98875162132fb8e1d8409 Mon Sep 17 00:00:00 2001
From: petit-miner <cooker5000@gmail.com>
Date: Fri, 10 Jul 2015 13:59:18 +0200
Subject: [PATCH 108/222] Added support for 2 mcp2515 CAN Bus IC
See: https://github.com/raspberrypi/linux/issues/1018
https://github.com/raspberrypi/linux/pull/1049
https://github.com/raspberrypi/linux/pull/1052
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 12 +++-
.../arm/boot/dts/overlays/mcp2515-can1-overlay.dts | 69 ++++++++++++++++++++++
3 files changed, 81 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -29,6 +29,7 @@ dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-ov
dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += lirc-rpi-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += mcp2515-can0-overlay.dtb
+dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -328,11 +328,21 @@ Params: gpio_out_pin GPIO fo
Name: mcp2515-can0
-Info: Configures the MCP2515 CAN controller
+Info: Configures the MCP2515 CAN controller on spi0.0
Load: dtoverlay=mcp2515-can0,<param>=<val>
Params: oscillator Clock frequency for the CAN controller (Hz)
spimaxfrequency Maximum SPI frequence (Hz)
+
+ interrupt GPIO for interrupt signal
+
+
+Name: mcp2515-can1
+Info: Configures the MCP2515 CAN controller on spi0.1
+Load: dtoverlay=mcp2515-can1,<param>=<val>
+Params: oscillator Clock frequency for the CAN controller (Hz)
+
+ spimaxfrequency Maximum SPI frequence (Hz)
interrupt GPIO for interrupt signal
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts
@@ -0,0 +1,69 @@
+/*
+ * Device tree overlay for mcp251x/can1 on spi0.1 edited by petit_miner
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
+ /* disable spi-dev for spi0.1 */
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ status = "okay";
+ spidev@1{
+ status = "disabled";
+ };
+ };
+ };
+
+ /* the interrupt pin of the can-controller */
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ can1_pins: can1_pins {
+ brcm,pins = <25>;
+ brcm,function = <0>; /* input */
+ };
+ };
+ };
+
+ /* the clock/oscillator of the can-controller */
+ fragment@2 {
+ target-path = "/clocks";
+ __overlay__ {
+ /* external oscillator of mcp2515 on spi0.1 */
+ can1_osc: can1_osc {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <16000000>;
+ };
+ };
+ };
+
+ /* the spi config of the can-controller itself binding everything together */
+ fragment@3 {
+ target = <&spi0>;
+ __overlay__ {
+ /* needed to avoid dtc warning */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ can1: mcp2515@1 {
+ reg = <1>;
+ compatible = "microchip,mcp2515";
+ pinctrl-names = "default";
+ pinctrl-0 = <&can1_pins>;
+ spi-max-frequency = <10000000>;
+ interrupt-parent = <&gpio>;
+ interrupts = <25 0x2>;
+ clocks = <&can1_osc>;
+ };
+ };
+ };
+ __overrides__ {
+ oscillator = <&can1_osc>,"clock-frequency:0";
+ spimaxfrequency = <&can1>,"spi-max-frequency:0";
+ interrupt = <&can1_pins>,"brcm,pins:0",<&can1>,"interrupts:0";
+ };
+};
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