TMDSIDK437X: BSP driver addition

Vrund Rana

Expert 1835 points

Part Number: TMDSIDK437X

Hello,

I am using IDKAM4376 board.

i am able to boot the board.

1) How to check uart from console?

2) what are important command that i can use?

3) How would i add UART1 driver to dts file?and how to test that?

Regards,

Vrund

0 Bin Liu over 4 years ago

Hi,

The following documents mention AM64x, but they are applicable to AM437x as well.

0 Vrund Rana over 4 years ago in reply to Bin Liu

Expert 1835 points

Ok. I am going through the details.

meanwhile i have gone through the

am437x-idk-evm.dts and am43xx-clocks.dtsi

this clock "dpll_per_m2_div4_wkupdm_ck is used for UART0.

which clock i need to use for UART1?

Regards,

Vrund

0 Bin Liu over 4 years ago in reply to Vrund Rana

Hi,

The UART clocks are specified in am437x-l4.dtsi. You don't need to modify them.

0 Vrund Rana over 4 years ago in reply to Bin Liu

Expert 1835 points

yes. i have seen that part..dtsi file.

but can you tell me which clock is used for uart 1.

as clock for uart 0 and uart 1 is different.

regards,

vrund

+1 Bin Liu over 4 years ago in reply to Vrund Rana

Here is how to figure it out:

am437x-l4.dtsi defines the UART1 clock as following:

689                         clocks = <&l4ls_clkctrl AM4_L4LS_UART2_CLKCTRL 0>;

Then search for AM4_L4LS_UART2_CLKCTRL in kernel source code, you would get:

drivers/clk/ti/clk-43xx.c:202:  { AM4_L4LS_UART2_CLKCTRL, NULL, CLKF_SW_SUP, "dpll_per_m2_div4_ck" },

so the UART1 clock is "dpll_per_m2_div4_ck".

Processors forum