[yocto] [meta-raspberrypi][PATCH] CAN: Add Pican2 support

[Fabien Lahoudere]

In order to make Pican 2 work, we :
- add mcp2515.dto to the overlay list
- add a variable to enable it in local.conf
- create a udev rule to mount interface

http://skpang.co.uk/catalog/pican2-canbus-board-for-raspberry-pi-23-p-1475.html

Signed-off-by: Fabien Lahoudere <***@collabora.com>
---
docs/extra-build-config.md | 9 +++++++++
recipes-bsp/bootfiles/rpi-config_git.bb | 6 ++++++
recipes-core/udev/udev-rules-rpi.bb | 6 +++++-
recipes-core/udev/udev-rules-rpi/can.rules | 1 +
4 files changed, 21 insertions(+), 1 deletion(-)
create mode 100644 recipes-core/udev/udev-rules-rpi/can.rules

diff --git a/docs/extra-build-config.md b/docs/extra-build-config.md
index 732c102..4376462 100644
--- a/docs/extra-build-config.md
+++ b/docs/extra-build-config.md
@@ -246,6 +246,15 @@ When using device tree kernels, set this variable to enable the 802.15.4 hat:

See: <https://openlabs.co/OSHW/Raspberry-Pi-802.15.4-radio>

+## Enable CAN with Pican2
+
+In order to use Pican2 CAN module, set the following variables:
+
+ ENABLE_SPI_BUS = "1"
+ ENABLE_CAN = "1"
+
+See: <http://skpang.co.uk/catalog/pican2-canbus-board-for-raspberry-pi-23-p-1475.html>
+
## Manual additions to config.txt

The `RPI_EXTRA_CONFIG` variable can be used to manually add additional lines to
diff --git a/recipes-bsp/bootfiles/rpi-config_git.bb b/recipes-bsp/bootfiles/rpi-config_git.bb
index d92b8e4..d0d1fba 100644
--- a/recipes-bsp/bootfiles/rpi-config_git.bb
+++ b/recipes-bsp/bootfiles/rpi-config_git.bb
@@ -183,6 +183,12 @@ do_deploy() {
echo "dtoverlay=at86rf233,speed=3000000" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
fi

+ # ENABLE CAN
+ if [ "${ENABLE_CAN}" = "1" ]; then
+ echo "# Enable CAN" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+ echo "dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+ fi
+
# Append extra config if the user has provided any
echo "${RPI_EXTRA_CONFIG}" >> ${DEPLOYDIR}/bcm2835-bootfiles/config.txt
}
diff --git a/recipes-core/udev/udev-rules-rpi.bb b/recipes-core/udev/udev-rules-rpi.bb
index edef0db..42cfcdd 100644
--- a/recipes-core/udev/udev-rules-rpi.bb
+++ b/recipes-core/udev/udev-rules-rpi.bb
@@ -2,7 +2,10 @@ DESCRIPTION = "udev rules for Raspberry Pi Boards"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"

-SRC_URI = " file://99-com.rules"
+SRC_URI = " \
+ file://99-com.rules \
+ file://can.rules \
+ "

S = "${WORKDIR}"

@@ -11,4 +14,5 @@ INHIBIT_DEFAULT_DEPS = "1"
do_install () {
install -d ${D}${sysconfdir}/udev/rules.d
install -m 0644 ${WORKDIR}/99-com.rules ${D}${sysconfdir}/udev/rules.d/
+ install -m 0644 ${WORKDIR}/can.rules ${D}${sysconfdir}/udev/rules.d/
}
diff --git a/recipes-core/udev/udev-rules-rpi/can.rules b/recipes-core/udev/udev-rules-rpi/can.rules
new file mode 100644
index 0000000..a47d57d
--- /dev/null
+++ b/recipes-core/udev/udev-rules-rpi/can.rules
@@ -0,0 +1 @@
+SUBSYSTEM=="net", DEVPATH=="/devices/platform/soc/3f204000.spi/spi_master/spi0/spi0.0/net/can0", RUN+="/sbin/ip link set can0 up type can bitrate 500000"

[Andrei Gherzan]

Hi Fabien,

On Fri, Nov 16, 2018 at 5:29 PM Fabien Lahoudere <

Post by Fabien Lahoudere
- add mcp2515.dto to the overlay list
- add a variable to enable it in local.conf
- create a udev rule to mount interface
http://skpang.co.uk/catalog/pican2-canbus-board-for-raspberry-pi-23-p-1475.html

Could you please submit this PR in github? Check the readme for more
information.
--
Andrei Gherzan