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

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Date:   Wed, 27 Sep 2023 10:18:57 +0000
From:   Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To:     Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     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" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH 1/2] spi: renesas,rzv2m-csi: Add SPI Slave related
 properties

Hi Mark,

Thanks for your reply!

> From: Mark Brown <broonie@...nel.org>
> 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.

Shall I invert the logic then? What I mean is I could drop property
"renesas,csi-ss" and add property "renesas,csi-no-ss" instead, therefore
without "renesas,csi-no-ss" pin SS will be used, with "renesas,csi-no-ss"
pin SS won't be used.
What do you think?

Also, I could drop "renesas,csi-ss-high" and use "spi-cs-high" instead?

Geert, any thoughts on the above?

Thanks,
Fab