linux-kernel - Re: [PATCH 3/3] arm64: dts: meson-g12-common: add uart_ao

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Message-ID: <fe58c139-f127-d102-a6a6-b8c2151aac20@baylibre.com>
Date:   Wed, 12 Jan 2022 09:33:42 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Gary Bisson <gary.bisson@...ndarydevices.com>,
        linux-amlogic@...ts.infradead.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: meson-g12-common: add uart_ao_b pins
 muxing

Hi,

On 03/01/2022 16:46, Gary Bisson wrote:
> - RX/TX signals can be mapped on 2 different pairs of pins so supporting
>   both options
> - RTS/CTS signals however only have 1 option available
> 
> Signed-off-by: Gary Bisson <gary.bisson@...ndarydevices.com>
> ---
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Cc: Kevin Hilman <khilman@...libre.com>
> Cc: Jerome Brunet <jbrunet@...libre.com>
> Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Cc: devicetree@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  .../boot/dts/amlogic/meson-g12-common.dtsi    | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> index af1357c48bee..3a7773ffbd08 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> @@ -1952,6 +1952,33 @@ mux {
>  						};
>  					};
>  
> +					uart_ao_b_1_pins: uart-ao-b-1 {
> +						mux {
> +							groups = "uart_ao_b_tx_2",
> +								 "uart_ao_b_rx_3";
> +							function = "uart_ao_b";
> +							bias-disable;
> +						};
> +					};
> +
> +					uart_ao_b_2_pins: uart-ao-b-2 {
> +						mux {
> +							groups = "uart_ao_b_tx_8",
> +								 "uart_ao_b_rx_9";
> +							function = "uart_ao_b";
> +							bias-disable;
> +						};
> +					};

I'm not fan of these nodes namings.

Perhaps :
- uart-ao-b-2-3
- uart-ao-b-8-9

so the actual pins numbers used are more clear ?

> +
> +					uart_ao_b_cts_rts_pins: uart-ao-b-cts-rts {
> +						mux {
> +							groups = "uart_ao_b_cts",
> +								 "uart_ao_b_rts";
> +							function = "uart_ao_b";
> +							bias-disable;
> +						};
> +					};
> +
>  					pwm_a_e_pins: pwm-a-e {
>  						mux {
>  							groups = "pwm_a_e";
>