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October 27, 2020 06:28
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2xMCP2517FD-overlay.dts
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| /* | |
| * Device tree overlay for mcp251x/mcp2517fd on spi0.0 | |
| */ | |
| /dts-v1/; | |
| /plugin/; | |
| / { | |
| compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709"; | |
| /* disable spi-dev for spi0.0 */ | |
| fragment@0{ | |
| target = <&spidev0>; | |
| __overlay__ { | |
| status = "disabled"; | |
| }; | |
| }; | |
| fragment@1{ | |
| target = <&spidev1>; | |
| __overlay__ { | |
| status = "disabled"; | |
| }; | |
| }; | |
| /* the interrupt pin of the can-controller */ | |
| fragment@2 { | |
| target = <&gpio>; | |
| __overlay__ { | |
| can_int_pins: can_int_pins { | |
| brcm,pins = <25 16>; | |
| brcm,function = <0>; /* input */ | |
| }; | |
| spi1_pins: spi1_pins { | |
| brcm,pins = <19 20 21>; | |
| brcm,function = <3>; /* alt4 */ | |
| }; | |
| spi1_cs_pins: spi1_cs_pins { | |
| brcm,pins = <26>; | |
| brcm,function = <1>; /* output */ | |
| }; | |
| }; | |
| }; | |
| /* the clock/oscillator of the can-controller */ | |
| fragment@3 { | |
| target-path = "/clocks"; | |
| __overlay__ { | |
| /* external 40M oscillator of mcp2517fd on SPI0.0 */ | |
| mcp2517fd_osc: mcp2517fd_osc { | |
| compatible = "fixed-clock"; | |
| #clock-cells = <0>; | |
| clock-frequency = <40000000>; | |
| }; | |
| }; | |
| }; | |
| /* the spi config of the can-controller itself binding everything together */ | |
| fragment@4 { | |
| target = <&spi0>; | |
| __overlay__ { | |
| /* needed to avoid dtc warning */ | |
| #address-cells = <1>; | |
| #size-cells = <0>; | |
| status = "okay"; | |
| can0: can@0 { | |
| reg = <0>; | |
| pinctrl-names = "default"; | |
| pinctrl-0 = <&can_int_pins>; | |
| compatible = "microchip,mcp2517fd"; | |
| spi-max-frequency = <125000000>; | |
| interrupt-parent = <&gpio>; | |
| interrupts = <25 8>; /* IRQ_TYPE_LEVEL_LOW */ | |
| clocks = <&mcp2517fd_osc>; | |
| }; | |
| }; | |
| }; | |
| /* the spi config of the can-controller itself binding everything together */ | |
| fragment@5 { | |
| target = <&spi1>; | |
| __overlay__ { | |
| /* needed to avoid dtc warning */ | |
| #address-cells = <1>; | |
| #size-cells = <0>; | |
| cs-gpios = <&gpio 26 1>; | |
| status = "okay"; | |
| can1: can@1 { | |
| reg = <0>; | |
| pinctrl-names = "default"; | |
| pinctrl-0 = <&spi1_pins &spi1_cs_pins>; | |
| compatible = "microchip,mcp2517fd"; | |
| spi-max-frequency = <125000000>; | |
| interrupt-parent = <&gpio>; | |
| interrupts = <16 8>; /* IRQ_TYPE_LEVEL_LOW */ | |
| clocks = <&mcp2517fd_osc>; | |
| }; | |
| }; | |
| }; | |
| }; |
How did you get it to work?
dtc -O dts -o 2xMCP2517FD-overlay.dtbo 2xMCP2517FD-overlay.dts
2xMCP2517FD-overlay.dts:93.25-102.15: Warning (spi_bus_reg): /fragment@5/overlay/can@1: SPI bus unit address format error, expected "0"
Could you share your /boot/config.txt file Raspberry PI version and OS?
I have the exact same Waveshare 2 CAN FD HAT unit and only one interface starts up and even then, I don't get any data.
@alexbewley Ok, here's the details. Right now, I'm running a Raspberry Pi4. /boot/config.txt is:
# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
# uncomment to force a console size. By default it will be display's size minus
# overscan.
framebuffer_width=1280
framebuffer_height=800
# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=off
# Automatically load overlays for detected cameras
camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Run in 64-bit mode
arm_64bit=1
# Disable compensation for displays with overscan
disable_overscan=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[all]
[pi4]
# Run as fast as firmware / board allows
arm_boost=1
[all]
# CAN HAT
dtoverlay=2xMCP2517FD
Kernel version is Linux pi4 5.15.24-v8+ #1526 SMP PREEMPT Fri Feb 18 14:59:51 GMT 2022 aarch64 GNU/Linux.
Userland is arm64-Raspbian based on Debian Bullseye.
Here's the relevant detection part from dmesg:
[ 7.149903] spi_master spi1: will run message pump with realtime priority
[ 7.156606] mcp251xfd spi1.0 (unnamed net_device) (uninitialized): Detected MCP2518FD, but firmware specifies a MCP2517FD. Fixing up.
[ 7.161757] mcp251xfd spi1.0 can0: MCP2518FD rev0.0 (-RX_INT -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:125.00MHz r:17.00MHz e:16.66MHz) successfully initialized.
[ 7.170694] vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops [vc4])
[ 7.172958] Registered IR keymap rc-cec
[ 7.176064] spi_master spi0: will run message pump with realtime priority
[ 7.184129] mcp251xfd spi0.0 (unnamed net_device) (uninitialized): Detected MCP2518FD, but firmware specifies a MCP2517FD. Fixing up.
[ 7.193176] rc rc1: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1
[ 7.212449] input: vc4 as /devices/platform/soc/fef05700.hdmi/rc/rc1/input3
[ 7.256007] vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops [vc4])
[ 7.256441] vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops [vc4])
[ 7.256762] vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.257070] vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.257354] vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.257585] vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.257863] vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops [vc4])
[ 7.265412] mcp251xfd spi0.0 can1: MCP2518FD rev0.0 (-RX_INT -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD c:40.00MHz m:125.00MHz r:17.00MHz e:16.66MHz) successfully initialized.
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This is the only overlay that can get my Waveshare 2 CAN FD HAT to work with the mainline drivers, thanks a lot!