linux-kernel - Re: [PATCH v4 2/3] dt-bindings: serial: amlogic,meson-uart: Add compatible string for T7

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Date:   Thu, 22 Jun 2023 11:04:34 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>
CC:     Lucas Tanure <tanure@...ux.com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>, Nick <nick@...das.com>,
        Artem <art@...das.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Conor Dooley <conor@...nel.org>
Subject: Re: [PATCH v4 2/3] dt-bindings: serial: amlogic,meson-uart: Add
 compatible string for T7

On Thu, Jun 22, 2023 at 11:38:49AM +0200, Neil Armstrong wrote:
> On 22/06/2023 11:26, Conor Dooley wrote:
> > On Thu, Jun 22, 2023 at 09:40:44AM +0100, Lucas Tanure wrote:
> > > Amlogic T7 SoCs uses the same UART controller as S4 SoCs and G12A.
> > > There is no need for an extra compatible line in the driver, but
> > > add T7 compatible line for documentation.
> > > 
> > > Co-developed-by: Conor Dooley <conor@...nel.org>
> > 
> > You can delete this, I don't need a Co-developed-by tag for review
> > feedback.
> > 
> > > Signed-off-by: Lucas Tanure <tanure@...ux.com>
> > > ---
> > >   .../devicetree/bindings/serial/amlogic,meson-uart.yaml      | 6 ++++++
> > >   1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
> > > index 01ec45b3b406..4ca4673169aa 100644
> > > --- a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
> > > +++ b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
> > > @@ -46,6 +46,12 @@ properties:
> > >             - amlogic,meson8b-uart
> > >             - amlogic,meson-gx-uart
> > >             - amlogic,meson-s4-uart
> > > +      - description: Everything-Else power domain UART controller on G12A compatible SoCs
> > 
> > s/Everything-Else/Always-on/
> 
> 
> "Everything-Else" was the amlogic naming for the non-always-on power domain, but it seems
> it's no more something used on new SoCs like the T7 family.
> 
> Anyway, the description is wrong, and it's a mess because we used "amlogic,meson-ao-uart"
> for uarts on the Always-On domain, but here it's described as Everything-Else...
> 
> Lucas, is there AO_uarts on T7 ? if not drop this amlogic,meson-ao-uart for the T7 UARTs.
> 
> But if there's no more AO uart controller, you'll need to change drivers/tty/serial/meson_uart.c
> and add a OF_EARLYCON_DECLARE() for amlogic,meson-t7-uart.
> 
> But still, why don't you use the amlogic,meson-s4-uart as fallback instead ?

That's probably my fault, I suggested the g12a in my reply to v3,
because that is the one from which the match data is being copied, so it
seemed like it'd make the most sense to me as the fallback.

btw Neil, is the "meson-gx-uart" a wildcard? Dunno the hardware, so
wasn't sure.

> +      - description: UART controller on T7 compatible SoCs
> +        items:
> +          - const: amlogic,meson-t7-uart
> +          - const: amlogic,meson-s4-uart

As mentioned on v (N-1), I am fine with this either. You can keep the
Ack Lucas with this change.

> and update meson_uart.c if there's no AO uarts anymore....
> 
> Neil
> 
> > Otherwise,
> > Acked-by: Conor Dooley <conor.dooley@...rochip.com>


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