linux-kernel - Re: [PATCH 1/2] spi: renesas,rzv2m-csi: Add SPI Slave related properties

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Message-ID: <ZRPuSidGd5zO6pXf@finisterre.sirena.org.uk>
Date:   Wed, 27 Sep 2023 10:56:42 +0200
From:   Mark Brown <broonie@...nel.org>
To:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 1/2] spi: renesas,rzv2m-csi: Add SPI Slave related
 properties

On Tue, Sep 26, 2023 at 10:08:17PM +0100, Fabrizio Castro wrote:
> The CSI IP found inside the Renesas RZ/V2M SoC can also work
> in SPI slave mode.
> When working in slave mode, the IP can make use of the SS
> (Slave Select) pin, with "low" as default active level.
> The active level of SS can be changed to "high" upon configuration.
> This patch adds two new properties, one to make use of the
> SS pin when in slave mode, and one to make the SS pin active high.

Please avoid the use of outdated terminology like this, prefer "device
mode" or similar.

> +  renesas,csi-ss:
> +    type: boolean
> +    description:
> +      Use CSI Slave Selection (SS) pin to enable transmission and reception when
> +      in slave mode.

When would this ever not be true when in device mode?

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