From 637535797f538a24a0ce2225185b24b14aa20d51 Mon Sep 17 00:00:00 2001
From: GabyPCgeeK <GabyPCgeeK@users.noreply.github.com>
Date: Mon, 27 Sep 2021 04:43:21 -0400
Subject: [PATCH] overlays: Add generic mcp2515 overlay
Can configure mcp2515 on spi0/1/2 without the need for multiple overlays.
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 15 ++
.../arm/boot/dts/overlays/mcp2515-overlay.dts | 156 ++++++++++++++++++
3 files changed, 172 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/mcp2515-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -113,6 +113,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
mbed-dac.dtbo \
mcp23017.dtbo \
mcp23s17.dtbo \
+ mcp2515.dtbo \
mcp2515-can0.dtbo \
mcp2515-can1.dtbo \
mcp251xfd.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1977,6 +1977,21 @@ Params: s08-spi<n>-<m>-present 4-bit in
or INTB output of MCP23S17 is connected.
+Name: mcp2515
+Info: Configures the MCP2515 CAN controller on spi0/1/2
+ For devices on spi1 or spi2, the interfaces should be enabled
+ with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
+Load: dtoverlay=mcp2515,<param>=<val>
+Params: spi<n>-<m> Configure device at spi<n>, cs<m>
+ (boolean, required)
+
+ oscillator Clock frequency for the CAN controller (Hz)
+
+ speed Maximum SPI frequence (Hz)
+
+ interrupt GPIO for interrupt signal
+
+
Name: mcp2515-can0
Info: Configures the MCP2515 CAN controller on spi0.0
Load: dtoverlay=mcp2515-can0,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mcp2515-overlay.dts
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/pinctrl/bcm2835.h>
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&spidev0>;
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@1 {
+ target = <&spidev1>;
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@2 {
+ target-path = "spi1/spidev@0";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@3 {
+ target-path = "spi1/spidev@1";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@4 {
+ target-path = "spi1/spidev@2";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@5 {
+ target-path = "spi2/spidev@0";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@6 {
+ target-path = "spi2/spidev@1";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@7 {
+ target-path = "spi2/spidev@2";
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@8 {
+ target = <&gpio>;
+ __overlay__ {
+ mcp2515_pins: mcp2515_pins {
+ brcm,pins = <25>;
+ brcm,function = <BCM2835_FSEL_GPIO_IN>;
+ };
+ };
+ };
+
+ fragment@9 {
+ target-path = "/clocks";
+ __overlay__ {
+ clk_mcp2515_osc: mcp2515-osc {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <16000000>;
+ };
+ };
+ };
+
+ mcp2515_frag: fragment@10 {
+ target = <&spi0>;
+ __overlay__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ mcp2515: mcp2515@0 {
+ compatible = "microchip,mcp2515";
+ reg = <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&mcp2515_pins>;
+ spi-max-frequency = <10000000>;
+ interrupt-parent = <&gpio>;
+ interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
+ clocks = <&clk_mcp2515_osc>;
+ };
+ };
+ };
+
+ __overrides__ {
+ spi0-0 = <0>, "+0",
+ <&mcp2515_frag>, "target:0=", <&spi0>,
+ <&mcp2515>, "reg:0=0",
+ <&mcp2515_pins>, "name=mcp2515_spi0_0_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi0-0-osc";
+ spi0-1 = <0>, "+1",
+ <&mcp2515_frag>, "target:0=", <&spi0>,
+ <&mcp2515>, "reg:0=1",
+ <&mcp2515_pins>, "name=mcp2515_spi0_1_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi0-1-osc";
+ spi1-0 = <0>, "+2",
+ <&mcp2515_frag>, "target:0=", <&spi1>,
+ <&mcp2515>, "reg:0=0",
+ <&mcp2515_pins>, "name=mcp2515_spi1_0_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi1-0-osc";
+ spi1-1 = <0>, "+3",
+ <&mcp2515_frag>, "target:0=", <&spi1>,
+ <&mcp2515>, "reg:0=1",
+ <&mcp2515_pins>, "name=mcp2515_spi1_1_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi1-1-osc";
+ spi1-2 = <0>, "+4",
+ <&mcp2515_frag>, "target:0=", <&spi1>,
+ <&mcp2515>, "reg:0=2",
+ <&mcp2515_pins>, "name=mcp2515_spi1_2_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi1-2-osc";
+ spi2-0 = <0>, "+5",
+ <&mcp2515_frag>, "target:0=", <&spi2>,
+ <&mcp2515>, "reg:0=0",
+ <&mcp2515_pins>, "name=mcp2515_spi2_0_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi2-0-osc";
+ spi2-1 = <0>, "+6",
+ <&mcp2515_frag>, "target:0=", <&spi2>,
+ <&mcp2515>, "reg:0=1",
+ <&mcp2515_pins>, "name=mcp2515_spi2_1_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi2-1-osc";
+ spi2-2 = <0>, "+7",
+ <&mcp2515_frag>, "target:0=", <&spi2>,
+ <&mcp2515>, "reg:0=2",
+ <&mcp2515_pins>, "name=mcp2515_spi2_2_pins",
+ <&clk_mcp2515_osc>, "name=mcp2515-spi2-2-osc";
+ oscillator = <&clk_mcp2515_osc>, "clock-frequency:0";
+ speed = <&mcp2515>, "spi-max-frequency:0";
+ interrupt = <&mcp2515_pins>, "brcm,pins:0",
+ <&mcp2515>, "interrupts:0";
+ };
+};