Env

OH: v3.2.3
chip: rk3568

Content

首先查看源码中是否具有CAN_ROCKCHIP选项：

❯ find -name "Kconfig" -exec grep -n "CAN_ROCKCHIP" {} +
❯

发现什么都没有..好吧，那看到官方的rk3568的补丁并没有打到这里，需要自己进行适配。

去rockchip的kernel仓库找到关于can的部分：https://github.com/rockchip-linux/kernel/blob/develop-5.10/drivers/net/can/rockchip/

进入到我们的内核工作目录，没有Makefile创建的可以见这篇文章：https://blog.505218.xyz/2024/08/16/rk3568%E7%A7%BB%E6%A4%8DopenHarmony-v3-2-3-%E7%B3%BB%E7%BB%9F%E7%A7%BB%E6%A4%8D/

将刚才仓库的文件无论用什么方式放到driver/net/can/rockchip目录下，随后进行git操作:

❯ git add drivers/net/can/Makefile
❯ git add drivers/net/can/Kconfig
❯ git commit -m "can init"

并且修改driver/net/can/Makefile和driver/net/can/Kconfig:

❯ diff drivers/net/can/Makefile mmm
32d31
< obj-$(CONFIG_CAN_ROCKCHIP)	+= rockchip/
❯ diff drivers/net/can/Kconfig kkk
181d180
< source "drivers/net/can/rockchip/Kconfig"

随后修改config文件：

❯ diff arch/arm64/configs/rockchip_linux_defconfig ccc
6858,6860d6857
< CONFIG_CAN=y
< CONFIG_CAN_ROFKCHIP=y
< CONFIG_CANFD_ROCKCHIP=y

继续git操作:

❯ git add drivers/net/can/Makefile
❯ git add drivers/net/can/Kconfig
❯ git add drivers/net/can/rockchip
❯ git commit -m "add can support"

生成patch：

❯ git format-patch --subject-prefix='PATCH' -n -s -1
0001-add-can-support.patch
❯ cp 0001-add-can-support.patch /mnt/v3.2.3/kernel/linux/patches/linux-5.10/rk3568_patch/add-can-support.patch && rm *.patch

修改编译脚本：

❯ diff device/board/hihope/rk3568/kernel/build_kernel.sh device/board/hihope/rk3568/kernel/build_kernel.sh.1
34,35c34
< 		${ROOT_DIR}/kernel/linux/patches/linux-5.10/rk3568_patch/add-jl201-drivers.patch
< 		${ROOT_DIR}/kernel/linux/patches/linux-5.10/rk3568_patch/add-can-support.patch"
---
> 		${ROOT_DIR}/kernel/linux/patches/linux-5.10/rk3568_patch/add-jl201-drivers.patch"

修改设备树：


❯ vim device/board/hihope/rk3568/kernel/dts/rk3568-xxx.dtsi

# 以下内容添加
&can2 {
	compatible = "rockchip,rk3568-can-2.0";
	pinctrl-names = "default";
	pinctrl-0 = <&can2m0_pins>;
	status = "okay";
};

Ref

https://blog.505218.xyz/2024/08/16/rk3568%E7%A7%BB%E6%A4%8DopenHarmony-v3-2-3-%E7%B3%BB%E7%BB%9F%E7%A7%BB%E6%A4%8D/
https://github.com/rockchip-linux/kernel/blob/develop-5.10/drivers/net/can/rockchip/