netdev - Re: [PATCH 1/6] dt-bindings: panel: explicitly list SPI CPHA and CPOL

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Date:   Thu, 21 Jul 2022 13:30:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Markuss Broks <markuss.broks@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Marcelo Schmitt <marcelo.schmitt1@...il.com>,
        Tomislav Denis <tomislav.denis@....com>,
        Cosmin Tanislav <cosmin.tanislav@...log.com>,
        Nishant Malpani <nish.malpani25@...il.com>,
        Dragos Bogdan <dragos.bogdan@...log.com>,
        Nuno Sa <nuno.sa@...log.com>,
        Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Maxime Ripard <mripard@...nel.org>,
        Marek Belisko <marek@...delico.com>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Christian Eggers <ceggers@...i.de>,
        Beniamin Bia <beniamin.bia@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Oskar Andero <oskar.andero@...il.com>,
        Mårten Lindahl <martenli@...s.com>,
        Dan Murphy <dmurphy@...com>, Sean Nyekjaer <sean@...nix.com>,
        Cristian Pop <cristian.pop@...log.com>,
        Lukas Wunner <lukas@...ner.de>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
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        Sankar Velliangiri <navin@...umiz.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Stefan Wahren <stefan.wahren@...tech.com>,
        Pratyush Yadav <p.yadav@...com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-fbdev@...r.kernel.org, netdev@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH 1/6] dt-bindings: panel: explicitly list SPI CPHA and CPOL

On Thu, Jul 21, 2022 at 05:31:50PM +0200, Krzysztof Kozlowski wrote:
> The spi-cpha and spi-cpol properties are device specific and should be
> accepted only if device really needs them.  Explicitly list them in
> device bindings in preparation of their removal from generic
> spi-peripheral-props.yaml schema.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  .../bindings/display/panel/lgphilips,lb035q02.yaml   | 10 ++++++++++
>  .../bindings/display/panel/samsung,ld9040.yaml       | 10 ++++++++++
>  .../bindings/display/panel/samsung,lms380kf01.yaml   | 12 +++++++++---
>  .../bindings/display/panel/samsung,lms397kf04.yaml   | 12 +++++++++---
>  .../bindings/display/panel/samsung,s6d27a1.yaml      | 12 +++++++++---
>  .../bindings/display/panel/sitronix,st7789v.yaml     | 10 ++++++++++
>  .../devicetree/bindings/display/panel/tpo,td.yaml    | 10 ++++++++++
>  7 files changed, 67 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/lgphilips,lb035q02.yaml b/Documentation/devicetree/bindings/display/panel/lgphilips,lb035q02.yaml
> index 5e4e0e552c2f..0bd7bbad5b94 100644
> --- a/Documentation/devicetree/bindings/display/panel/lgphilips,lb035q02.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/lgphilips,lb035q02.yaml
> @@ -21,6 +21,16 @@ properties:
>    enable-gpios: true
>    port: true
>  
> +  spi-cpha:
> +    type: boolean
> +    description:
> +      The device requires shifted clock phase (CPHA) mode.
> +
> +  spi-cpol:
> +    type: boolean
> +    description:
> +      The device requires inverse clock polarity (CPOL) mode.

Not great duplicating the type and description everywhere.

We can move the definition back to spi-controller.yaml, so then that 
does type checking of the property, but not presence/absence checks.

Rob