linux-kernel - Re: [PATCH 4/6] dt-bindings: serial: amlogic, meson-uart: support T7

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Message-ID: <20230618-ammonium-scratch-2990eb8c3ac7@spud>
Date:   Sun, 18 Jun 2023 20:18:04 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Lucas Tanure <tanure@...ux.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick <nick@...das.com>, Artem <art@...das.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 4/6] dt-bindings: serial: amlogic, meson-uart: support T7

On Sun, Jun 18, 2023 at 06:37:40PM +0100, Lucas Tanure wrote:
> On Thu, Jun 15, 2023 at 10:25 PM Conor Dooley <conor@...nel.org> wrote:
> >
> > On Thu, Jun 15, 2023 at 07:29:36PM +0100, Lucas Tanure wrote:
> > > Add serial bindings support menson T7 SoC family.
> > >
> > > Signed-off-by: Lucas Tanure <tanure@...ux.com>
> > > ---
> > >  Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
> > > index 01ec45b3b406..01b01f8840ea 100644
> > > --- a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
> > > +++ b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
> > > @@ -46,6 +46,7 @@ properties:
> > >            - amlogic,meson8b-uart
> > >            - amlogic,meson-gx-uart
> > >            - amlogic,meson-s4-uart
> > > +          - amlogic,meson-t7-uart
> >
> > | diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> > | index 2501db5a7aaf..0208f9a6ba7e 100644
> > | --- a/drivers/tty/serial/meson_uart.c
> > | +++ b/drivers/tty/serial/meson_uart.c
> > | @@ -796,6 +796,10 @@ static const struct of_device_id meson_uart_dt_match[] = {
> > |                 .compatible = "amlogic,meson-s4-uart",
> > |                 .data = (void *)&meson_g12a_uart_data,
> > |         },
> > | +       {
> > | +               .compatible = "amlogic,meson-t7-uart",
> > | +               .data = (void *)&meson_g12a_uart_data,
> > | +       },
> > |         { /* sentinel */ },
> > |  };
> > |  MODULE_DEVICE_TABLE(of, meson_uart_dt_match);
> >
> > You're adding another element to this enum, but the driver change
> > implies compatibility with the s4 uart. Should you not set this up with
> > fallback compatibles?
> 
> I will drop this patch and use the s4 and g12a compatible strings.

You still need to add a compatible for the t7, just let it fall back to
one of the others. Eg:
compatible = "amlogic,meson-t7-uart", "amlogic,meson-s4-uart";

Cheers,
Conor.

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