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

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Date:   Wed, 12 Jan 2022 14:01:15 +0100
From:   Gary Bisson <gary.bisson@...ndarydevices.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-amlogic@...ts.infradead.org,
        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 Wed, Jan 12, 2022 at 09:33:42AM +0100, Neil Armstrong wrote:
> 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 ?

Sure, I wasn't convinced by that naming either. I although thought
about:
- uart-ao-b
- uart-ao-b-alt

Let me know which one you prefer and I'll respin the patch.
Also let me know if I should re-send the entire series or just this
patch.

Regards,
Gary