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8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
218 lines
6.1 KiB
Diff
218 lines
6.1 KiB
Diff
From 0f49536b413a81aedb9635c7b2613ca5a8d554c4 Mon Sep 17 00:00:00 2001
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From: menschel <menschel.p@posteo.de>
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Date: Wed, 30 Dec 2020 21:55:34 +0100
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Subject: [PATCH] Add overlay for Seeed Studio CAN BUS FD HAT (#4034)
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This patch adds the overlay for the Seeed Studio CAN BUS FD HAT
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with two CAN FD Channels and an RTC.
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https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html
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The overlay was generated by
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ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \
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mcp251xfd-overlay.dts,spi0-1,interrupt=24 \
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i2c-rtc-overlay.dts,pcf85063
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Also, add description on how to generate overlays
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Signed-off-by: Patrick Menschel <menschel.p@posteo.de>
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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 | 46 +++++++
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.../dts/overlays/seeed-can-fd-hat-overlay.dts | 117 ++++++++++++++++++
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3 files changed, 164 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/seeed-can-fd-hat-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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@@ -161,6 +161,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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sc16is752-spi1.dtbo \
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sdhost.dtbo \
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sdio.dtbo \
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+ seeed-can-fd-hat.dtbo \
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sh1106-spi.dtbo \
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smi.dtbo \
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smi-dev.dtbo \
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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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@@ -81,6 +81,44 @@ Parameters usually have default values,
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mandatory. See the list of overlays below for a description of the parameters
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and their defaults.
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+Making new Overlays based on existing Overlays
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+==============================================
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+
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+Recent overlays have been designed in a more general way, so that they can be
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+adapted to hardware by changing their parameters. When you have additional
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+hardware with more than one device of a kind, you end up using the same overlay
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+multiple times with other parameters, e.g.
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+
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+ # 2 CAN FD interfaces on spi but with different pins
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+ dtoverlay=mcp251xfd,spi0-0,interrupt=25
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+ dtoverlay=mcp251xfd,spi0-1,interrupt=24
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+
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+ # a realtime clock on i2c
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+ dtoverlay=i2c-rtc,pcf85063
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+
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+While this approach does work, it requires knowledge about the hardware design.
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+It is more feasible to simplify things for the end user by providing a single
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+overlay as it is done the traditional way.
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+
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+A new overlay can be generated by using ovmerge utility.
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+https://github.com/raspberrypi/utils/blob/master/ovmerge/ovmerge
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+
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+To generate an overlay for the above configuration we pass the configuration
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+to ovmerge and add the -c flag.
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+
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+ ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \
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+ mcp251xfd-overlay.dts,spi0-1,interrupt=24 \
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+ i2c-rtc-overlay.dts,pcf85063 \
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+ >> merged-overlay.dts
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+
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+The -c option writes the command above as a comment into the overlay as
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+a marker that this overlay is generated and how it was generated.
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+After compiling the overlay it can be loaded in a single line.
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+
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+ dtoverlay=merged
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+
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+It does the same as the original configuration but without parameters.
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+
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The Overlay and Parameter Reference
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===================================
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@@ -2466,6 +2504,14 @@ Info: This overlay is now deprecated.
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Load: <Deprecated>
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+Name: seeed-can-fd-hat
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+Info: Overlay for Seeed Studio CAN BUS FD HAT with two CAN FD channels and an
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+ RTC.
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+ https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html
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+Load: dtoverlay=seeed-can-fd-hat
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+Params: <None>
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+
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+
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Name: sh1106-spi
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Info: Overlay for SH1106 OLED via SPI using fbtft staging driver.
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Load: dtoverlay=sh1106-spi,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/seeed-can-fd-hat-overlay.dts
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@@ -0,0 +1,117 @@
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+// redo: ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 mcp251xfd-overlay.dts,spi0-1,interrupt=24 i2c-rtc-overlay.dts,pcf85063
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+
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+// Device tree overlay for https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html
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+
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/gpio/gpio.h>
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+#include <dt-bindings/interrupt-controller/irq.h>
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+#include <dt-bindings/pinctrl/bcm2835.h>
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+ fragment@0 {
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+ target = <&spidev0>;
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+ __overlay__ {
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+ status = "disabled";
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+ };
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+ };
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ mcp251xfd_pins: mcp251xfd_spi0_0_pins {
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+ brcm,pins = <25>;
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+ brcm,function = <BCM2835_FSEL_GPIO_IN>;
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+ };
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+ };
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+ };
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+ fragment@2 {
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+ target-path = "/clocks";
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+ __overlay__ {
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+ clk_mcp251xfd_osc: mcp251xfd-spi0-0-osc {
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+ #clock-cells = <0>;
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+ compatible = "fixed-clock";
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+ clock-frequency = <40000000>;
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+ };
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+ };
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+ };
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+ fragment@3 {
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+ target = <&spi0>;
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+ __overlay__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ mcp251xfd@0 {
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+ compatible = "microchip,mcp251xfd";
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+ reg = <0>;
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&mcp251xfd_pins>;
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+ spi-max-frequency = <20000000>;
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+ interrupt-parent = <&gpio>;
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+ interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
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+ clocks = <&clk_mcp251xfd_osc>;
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+ };
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+ };
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+ };
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+ fragment@4 {
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+ target = <&spidev1>;
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+ __overlay__ {
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+ status = "disabled";
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+ };
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+ };
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+ fragment@5 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ mcp251xfd_pins_1: mcp251xfd_spi0_1_pins {
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+ brcm,pins = <24>;
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+ brcm,function = <BCM2835_FSEL_GPIO_IN>;
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+ };
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+ };
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+ };
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+ fragment@6 {
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+ target-path = "/clocks";
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+ __overlay__ {
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+ clk_mcp251xfd_osc_1: mcp251xfd-spi0-1-osc {
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+ #clock-cells = <0>;
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+ compatible = "fixed-clock";
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+ clock-frequency = <40000000>;
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+ };
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+ };
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+ };
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+ fragment@7 {
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+ target = <&spi0>;
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+ __overlay__ {
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ mcp251xfd@1 {
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+ compatible = "microchip,mcp251xfd";
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+ reg = <1>;
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&mcp251xfd_pins_1>;
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+ spi-max-frequency = <20000000>;
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+ interrupt-parent = <&gpio>;
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+ interrupts = <24 IRQ_TYPE_LEVEL_LOW>;
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+ clocks = <&clk_mcp251xfd_osc_1>;
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+ };
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+ };
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+ };
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+ fragment@8 {
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+ target = <&i2cbus>;
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ pcf85063@51 {
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+ compatible = "nxp,pcf85063";
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+ reg = <0x51>;
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+ };
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+ };
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+ };
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+ fragment@9 {
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+ target = <&i2c_arm>;
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+ i2cbus: __overlay__ {
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+ status = "okay";
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+ };
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+ };
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+};
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