diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch b/target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch new file mode 100644 index 0000000000..a5bbbdd4e6 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch @@ -0,0 +1,217 @@ +From 4a314a9b9d91cacbf6be9dd521cf3abd3ae8bcef Mon Sep 17 00:00:00 2001 +From: menschel <menschel.p@posteo.de> +Date: Wed, 30 Dec 2020 21:55:34 +0100 +Subject: [PATCH] Add overlay for Seeed Studio CAN BUS FD HAT (#4034) + +This patch adds the overlay for the Seeed Studio CAN BUS FD HAT +with two CAN FD Channels and an RTC. +https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html + +The overlay was generated by +ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \ + mcp251xfd-overlay.dts,spi0-1,interrupt=24 \ + i2c-rtc-overlay.dts,pcf85063 + + +Also, add description on how to generate overlays + +Signed-off-by: Patrick Menschel <menschel.p@posteo.de> +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 46 +++++++ + .../dts/overlays/seeed-can-fd-hat-overlay.dts | 117 ++++++++++++++++++ + 3 files changed, 164 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/seeed-can-fd-hat-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -159,6 +159,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ + sc16is752-spi1.dtbo \ + sdhost.dtbo \ + sdio.dtbo \ ++ seeed-can-fd-hat.dtbo \ + sh1106-spi.dtbo \ + smi.dtbo \ + smi-dev.dtbo \ +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -81,6 +81,44 @@ Parameters usually have default values, + mandatory. See the list of overlays below for a description of the parameters + and their defaults. + ++Making new Overlays based on existing Overlays ++============================================== ++ ++Recent overlays have been designed in a more general way, so that they can be ++adapted to hardware by changing their parameters. When you have additional ++hardware with more than one device of a kind, you end up using the same overlay ++multiple times with other parameters, e.g. ++ ++ # 2 CAN FD interfaces on spi but with different pins ++ dtoverlay=mcp251xfd,spi0-0,interrupt=25 ++ dtoverlay=mcp251xfd,spi0-1,interrupt=24 ++ ++ # a realtime clock on i2c ++ dtoverlay=i2c-rtc,pcf85063 ++ ++While this approach does work, it requires knowledge about the hardware design. ++It is more feasible to simplify things for the end user by providing a single ++overlay as it is done the traditional way. ++ ++A new overlay can be generated by using ovmerge utility. ++https://github.com/raspberrypi/utils/blob/master/ovmerge/ovmerge ++ ++To generate an overlay for the above configuration we pass the configuration ++to ovmerge and add the -c flag. ++ ++ ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \ ++ mcp251xfd-overlay.dts,spi0-1,interrupt=24 \ ++ i2c-rtc-overlay.dts,pcf85063 \ ++ >> merged-overlay.dts ++ ++The -c option writes the command above as a comment into the overlay as ++a marker that this overlay is generated and how it was generated. ++After compiling the overlay it can be loaded in a single line. ++ ++ dtoverlay=merged ++ ++It does the same as the original configuration but without parameters. ++ + The Overlay and Parameter Reference + =================================== + +@@ -2422,6 +2460,14 @@ Info: This overlay is now deprecated. + Load: <Deprecated> + + ++Name: seeed-can-fd-hat ++Info: Overlay for Seeed Studio CAN BUS FD HAT with two CAN FD channels and an ++ RTC. ++ https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html ++Load: dtoverlay=seeed-can-fd-hat ++Params: <None> ++ ++ + Name: sh1106-spi + Info: Overlay for SH1106 OLED via SPI using fbtft staging driver. + Load: dtoverlay=sh1106-spi,<param>=<val> +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/seeed-can-fd-hat-overlay.dts +@@ -0,0 +1,117 @@ ++// redo: ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 mcp251xfd-overlay.dts,spi0-1,interrupt=24 i2c-rtc-overlay.dts,pcf85063 ++ ++// Device tree overlay for https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html ++ ++/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>; ++ __overlay__ { ++ status = "disabled"; ++ }; ++ }; ++ fragment@1 { ++ target = <&gpio>; ++ __overlay__ { ++ mcp251xfd_pins: mcp251xfd_spi0_0_pins { ++ brcm,pins = <25>; ++ brcm,function = <BCM2835_FSEL_GPIO_IN>; ++ }; ++ }; ++ }; ++ fragment@2 { ++ target-path = "/clocks"; ++ __overlay__ { ++ clk_mcp251xfd_osc: mcp251xfd-spi0-0-osc { ++ #clock-cells = <0>; ++ compatible = "fixed-clock"; ++ clock-frequency = <40000000>; ++ }; ++ }; ++ }; ++ fragment@3 { ++ target = <&spi0>; ++ __overlay__ { ++ status = "okay"; ++ #address-cells = <1>; ++ #size-cells = <0>; ++ mcp251xfd@0 { ++ compatible = "microchip,mcp251xfd"; ++ reg = <0>; ++ pinctrl-names = "default"; ++ pinctrl-0 = <&mcp251xfd_pins>; ++ spi-max-frequency = <20000000>; ++ interrupt-parent = <&gpio>; ++ interrupts = <25 IRQ_TYPE_LEVEL_LOW>; ++ clocks = <&clk_mcp251xfd_osc>; ++ }; ++ }; ++ }; ++ fragment@4 { ++ target = <&spidev1>; ++ __overlay__ { ++ status = "disabled"; ++ }; ++ }; ++ fragment@5 { ++ target = <&gpio>; ++ __overlay__ { ++ mcp251xfd_pins_1: mcp251xfd_spi0_1_pins { ++ brcm,pins = <24>; ++ brcm,function = <BCM2835_FSEL_GPIO_IN>; ++ }; ++ }; ++ }; ++ fragment@6 { ++ target-path = "/clocks"; ++ __overlay__ { ++ clk_mcp251xfd_osc_1: mcp251xfd-spi0-1-osc { ++ #clock-cells = <0>; ++ compatible = "fixed-clock"; ++ clock-frequency = <40000000>; ++ }; ++ }; ++ }; ++ fragment@7 { ++ target = <&spi0>; ++ __overlay__ { ++ status = "okay"; ++ #address-cells = <1>; ++ #size-cells = <0>; ++ mcp251xfd@1 { ++ compatible = "microchip,mcp251xfd"; ++ reg = <1>; ++ pinctrl-names = "default"; ++ pinctrl-0 = <&mcp251xfd_pins_1>; ++ spi-max-frequency = <20000000>; ++ interrupt-parent = <&gpio>; ++ interrupts = <24 IRQ_TYPE_LEVEL_LOW>; ++ clocks = <&clk_mcp251xfd_osc_1>; ++ }; ++ }; ++ }; ++ fragment@8 { ++ target = <&i2cbus>; ++ __overlay__ { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ pcf85063@51 { ++ compatible = "nxp,pcf85063"; ++ reg = <0x51>; ++ }; ++ }; ++ }; ++ fragment@9 { ++ target = <&i2c_arm>; ++ i2cbus: __overlay__ { ++ status = "okay"; ++ }; ++ }; ++}; |