AM625: AM6x SK - EVM: linux drivers to control PRU UART

Rafael Volkmer

Part Number: AM625

As mentioned earlier, I would like more details about the implementation and possibility of manipulating the UART of the AM62x PRU by the Kernel drivers, without the need to use bare-metal.

over 1 year ago

0 Nick Saulnier over 1 year ago

TI__Guru** 100800 points

Hello Rafael,

The AM335x implementation of a Linux driver directly controlling the PRU UART is documented here:
https://software-dl.ti.com/processor-sdk-linux/esd/docs/07_03_00_005/linux/Foundational_Components/PRU-ICSS/Linux_Drivers/pruss-uart.html

The PRU subsystem hardware designer confirmed that the UART in the AM335x PRU-ICSS is exactly the same as the UART in the AM62x. From a register definition standpoint, that makes sense to me - I just double-checked the AM62x PRU_Hardware_UART code I shared on your other thread, and I AM setting every bit to the exact same setting as on AM335x (though it might look a bit different).

Since the UART is exactly the same, it should be pretty low effort to port to AM62x: you would need to make the kernel dts change, and then test it. You can refer to the AM335x dts code here:
arch/arm/boot/dts/am33xx-l4.dtsi
pruss_uart

Regards,

Nick

0 Nick Saulnier over 1 year ago in reply to Nick Saulnier

TI__Guru** 100800 points

arch/arm/boot/dts/am335x-evmsk.dts includes example usage of pruss_uart.

Regards,

Nick

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AM625: AM6x SK - EVM: linux drivers to control PRU UART