linux-kernel - Re: [PATCH V3 3/6] dt-bindings: serial: meson: Support S4 SoC uart. Also Drop compatible = amlogic,meson-gx-uart.

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Date:   Thu, 30 Dec 2021 23:34:41 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Yu Tu <yu.tu@...ogic.com>
Cc:     linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Vyacheslav <adeep@...ina.in>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH V3 3/6] dt-bindings: serial: meson: Support S4 SoC uart.
 Also Drop compatible = amlogic,meson-gx-uart.

Hello,

as Greg already mentioned the $subject line is very long.

On Thu, Dec 30, 2021 at 11:21 AM Yu Tu <yu.tu@...ogic.com> wrote:
> Deprecated, don't use anymore because compatible = amlogic,meson-gx-uart
> don't differentiate between GXBB and GXL which have different
> revisions of the UART IP. So it's split into GXBB and GXL.
actually it's split into GXBB, GXL and G12A

[...]
> -              - amlogic,meson-gx-uart
> +              - amlogic,meson-gxbb-uart
> +              - amlogic,meson-gxl-uart
> +              - amlogic,meson-g12a-uart
> +              - amlogic,meson-s4-uart
In addition to Greg's comment I suggest splitting this into two patches:
- one where the "amlogic,meson-gx-uart" compatible is marked as
deprecated (Documentation/devicetree/bindings/power/supply/bq27xxx.yaml
has an example for deprecated entries) and GXBB, GXL and G12A
compatible strings are added instead
- another one where the new S4 compatible string is added

The idea here is to have "one logical change per patch".
Deprecating and replacing "amlogic,meson-gx-uart" is one logical change.
Adding a new compatible string is another logical change.
I am hoping that this will also make it easier to find a shorter
$subject line (which according to the patch submission guide [0]
should be 70-75 characters: "the summary must be no more than 70-75
characters")


Best regards,
Martin


[0] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#the-canonical-patch-format