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

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Message-ID: <ZRP+ZNXe975hcEJJ@finisterre.sirena.org.uk>
Date:   Wed, 27 Sep 2023 12:05:24 +0200
From:   Mark Brown <broonie@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        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 Wed, Sep 27, 2023 at 11:44:17AM +0200, Geert Uytterhoeven wrote:
> On Wed, Sep 27, 2023 at 11:21 AM Mark Brown <broonie@...nel.org> wrote:

> > I see.  Is there any control over what the chip select is when there is
> > one, in which case we could just look to see if there's one specified?

> On RZ/V2M there isn't, as there is only a single hardware chip select.

> On MSIOF, there are 3 hardware chip selects, but apparently only the
> primary one can be used in target mode.

OK, it sounds like we do need a property then.  Like I say I'd rather
not have one that just works for _NO_CS in order to avoid confusion for
people writing SPI device drivers, either something in the generic
target binding or a device specific one.

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