Hi Mani,
On Mon, Apr 20, 2020 at 7:02 PM <mani@xxxxxxxxxx> wrote:
> From: Manivannan Sadhasivam <mani@xxxxxxxxxx>
>
> Document the use of CTS/RTS gpios for flow control in STM32 UART
> controller. These properties can be used instead of 'st,hw-flow-ctrl'
> for making use of any gpio pins for flow control instead of dedicated
> pins. It should be noted that both CTS/RTS and 'st,hw-flow-ctrl'
> properties cannot co-exist in a design.
>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> Signed-off-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
> --- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
> +++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
> @@ -55,6 +61,14 @@ properties:
> linux,rs485-enabled-at-boot-time: true
> rs485-rx-during-tx: true
>
> +if:
> + required:
> + - st,hw-flow-ctrl
Perhaps "st,hw-flow-ctrl" should be deprecated, in favor of the standard
"uart-has-rtscts" property?
Of course the driver needs to gain support for the latter first.
> +then:
> + properties:
> + cts-gpios: false
> + rts-gpios: false
> +
> required:
> - compatible
> - reg
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
