Where to modify the rpi5 kernel dts to enable the extra UART in pinout?

[tonyho]

I see there's a cm2712-rpi-5-b.dtb file but I cannot find the corresponding dts file using find -name cm2712-rpi-5-b.dts*.

I want to expose a TTL in pinout from kernel to be used for my Bluetooth controller, for example the GPIO4 and GPIO5 as UART2 RX/TX. But don't know how to enable it.

As in other boards like the amlogic and rockchip based ones, it can be archived by modify the dts file.

Any tips?

[rsglobal]

There's no rpi-5 support at the moment. However, all the dts files are located in the kernel tree.

[tonyho]

There's no rpi-5 support at the moment. However, all the dts files are located in the kernel tree.

My mistake, I missup the rpi4 and rpi5.

Which one is used for rpi4b?

$find -name bcm2711-rpi-4-b.dts
./aosptree/glodroid/kernel/broadcom/arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b.dts
./aosptree/glodroid/kernel/broadcom/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
./aosptree/glodroid/bootloader/u-boot/dts/upstream/src/arm64/broadcom/bcm2711-rpi-4-b.dts
./aosptree/glodroid/bootloader/u-boot/dts/upstream/src/arm/broadcom/bcm2711-rpi-4-b.dts
./aosptree/glodroid/bootloader/u-boot/arch/arm/dts/bcm2711-rpi-4-b.dts

And any tips to add the UART? Thanks.

[tonyho]

I thinks I found it: ./aosptree/glodroid/kernel/broadcom/arch/arm/boot/dts/bcm2711-rpi-4-b.dts