122 lines
4 KiB
Diff
122 lines
4 KiB
Diff
From 5c8148df6f5147fcaa9fe81425b58a3e7a64cdba Mon Sep 17 00:00:00 2001
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From: petit-miner <cooker5000@gmail.com>
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Date: Fri, 10 Jul 2015 13:59:18 +0200
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Subject: [PATCH 108/121] Added support for 2 mcp2515 CAN Bus IC
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See: https://github.com/raspberrypi/linux/issues/1018
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https://github.com/raspberrypi/linux/pull/1049
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https://github.com/raspberrypi/linux/pull/1052
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 12 +++-
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.../arm/boot/dts/overlays/mcp2515-can1-overlay.dts | 69 ++++++++++++++++++++++
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3 files changed, 81 insertions(+), 1 deletion(-)
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create mode 100644 arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -29,6 +29,7 @@ dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-ov
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dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += lirc-rpi-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += mcp2515-can0-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -328,11 +328,21 @@ Params: gpio_out_pin GPIO fo
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Name: mcp2515-can0
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-Info: Configures the MCP2515 CAN controller
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+Info: Configures the MCP2515 CAN controller on spi0.0
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Load: dtoverlay=mcp2515-can0,<param>=<val>
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Params: oscillator Clock frequency for the CAN controller (Hz)
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spimaxfrequency Maximum SPI frequence (Hz)
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+
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+ interrupt GPIO for interrupt signal
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+
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+
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+Name: mcp2515-can1
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+Info: Configures the MCP2515 CAN controller on spi0.1
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+Load: dtoverlay=mcp2515-can1,<param>=<val>
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+Params: oscillator Clock frequency for the CAN controller (Hz)
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+
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+ spimaxfrequency Maximum SPI frequence (Hz)
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interrupt GPIO for interrupt signal
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts
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@@ -0,0 +1,69 @@
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+/*
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+ * Device tree overlay for mcp251x/can1 on spi0.1 edited by petit_miner
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
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+ /* disable spi-dev for spi0.1 */
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+ fragment@0 {
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+ target = <&spi0>;
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+ __overlay__ {
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+ status = "okay";
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+ spidev@1{
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+ status = "disabled";
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+ };
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+ };
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+ };
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+
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+ /* the interrupt pin of the can-controller */
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ can1_pins: can1_pins {
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+ brcm,pins = <25>;
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+ brcm,function = <0>; /* input */
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+ };
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+ };
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+ };
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+
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+ /* the clock/oscillator of the can-controller */
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+ fragment@2 {
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+ target-path = "/clocks";
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+ __overlay__ {
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+ /* external oscillator of mcp2515 on spi0.1 */
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+ can1_osc: can1_osc {
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+ compatible = "fixed-clock";
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+ #clock-cells = <0>;
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+ clock-frequency = <16000000>;
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+ };
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+ };
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+ };
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+
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+ /* the spi config of the can-controller itself binding everything together */
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+ fragment@3 {
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+ target = <&spi0>;
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+ __overlay__ {
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+ /* needed to avoid dtc warning */
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ can1: mcp2515@1 {
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+ reg = <1>;
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+ compatible = "microchip,mcp2515";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&can1_pins>;
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+ spi-max-frequency = <10000000>;
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+ interrupt-parent = <&gpio>;
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+ interrupts = <25 0x2>;
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+ clocks = <&can1_osc>;
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+ };
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+ };
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+ };
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+ __overrides__ {
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+ oscillator = <&can1_osc>,"clock-frequency:0";
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+ spimaxfrequency = <&can1>,"spi-max-frequency:0";
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+ interrupt = <&can1_pins>,"brcm,pins:0",<&can1>,"interrupts:0";
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+ };
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+};
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