linux-kernel - Re: [PATCH 01/11] spi: dw: define capability for enhanced spi

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Message-ID: <CAHyZL-dA+mFW6Jcvpds69f-9iJf6nk7PCpO6S2Au+ugSZMgisw@mail.gmail.com>
Date:   Wed, 3 Aug 2022 18:34:53 +0100
From:   Sudip Mukherjee <sudip.mukherjee@...ive.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>,
        William Salmon <william.salmon@...ive.com>,
        Adnan Chowdhury <adnan.chowdhury@...ive.com>,
        Ben Dooks <ben.dooks@...ive.com>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeegar Lakhani <jeegar.lakhani@...ive.com>
Subject: Re: [PATCH 01/11] spi: dw: define capability for enhanced spi

On Tue, Aug 2, 2022 at 7:48 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Tue, Aug 02, 2022 at 06:57:45PM +0100, Sudip Mukherjee wrote:
>
> > Some Synopsys SSI controllers support enhanced SPI which includes
> > Dual mode, Quad mode and Octal mode. Define the capability and mention
> > it in the controller supported modes.
>
> > +#define DW_SPI_CAP_EXT_SPI           BIT(2)
>
> This isn't at all descriptive, it'd be better to have a capability bit
> for the various multi-line data modes (or possibly individual bits for
> them, though board setup will stop us using things that aren't supported
> in a given design anyway so it's a bit redundant) - that'd be a lot
> clearer and avoid confusion further down the line when some other
> feature gets added.

Do you mean to add separate capability bit like:
DW_SPI_CAP_DUAL_SPI
DW_SPI_CAP_QUAD_SPI and
DW_SPI_CAP_OCTAL_SPI ?


--
Regards
Sudip