Hi ahni, Thanks a lot for this info, I will try This out & see if UART3
Works.
On Thursday, April 23, 2020 at 7:53:18 AM UTC+5:30, ahni...@gmail.com wrote:
>
>
> I hope it is helpful for uart3 /dev/ttyS2 device tree implementation.
>
> Uart3 RX starts working after the mode update to
>
> PIN_INPUT_PULLUP | MUX_MODE1 // P9.22b uart3_rxd
>
> Mode is confirmed as the following:
>
>
> P9.22b 240 fast rx up 1 uart 2 rxd serial@48020000 (uart3)
>
> pin 240 (PIN240) 4a0037c0 00060001 pinctrl-single ( instead of 00000001)
>
>
>
> UART3 TX was working without any pull up or pull down.
>
> P9_21, MUX_MODE1 ) // P9.21 uart3_txd
>
> pin 241 (PIN241) 4a0037c4 00000001 pinctrl-single
>
>
>
> To activate uart3, please add the following code into *.dts file and
> compile to *.dtb.
>
> Also please modify the am572*ai.dts file by deactivating the shared pins.
>
>
> &uart3 {
>
> status = "okay";
>
> pinctrl-names = "default";
>
> pinctrl-0 = <&uart3_pins>;
>
> };
>
> &dra7_pmx_core {
>
> uart3_pins: uart3 {
>
> pinctrl-single,pins = <
>
> DRA7XX_CORE_IOPAD( P9_21, MUX_MODE1 ) // P9.21 uart3_txd
>
> DRA7XX_CORE_IOPAD( P9_22b, PIN_INPUT_PULLUP | MUX_MODE1) // P9.22b
> uart3_rxd
>
> DRA7XX_CORE_IOPAD( P9_22a, MUX_MODE15) // P9.22a driver_off //shared-pin
>
> >;
>
> };
>
>
>
> };
>
>
>
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