linux-kernel - Re: [PATCH 2/9] spi: core: Add flag for controllers that can't hold cs between transfers

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Message-ID: <20210824163852.GG4393@sirena.org.uk>
Date:   Tue, 24 Aug 2021 17:38:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Lucas Tanure <tanureal@...nsource.cirrus.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Sanjay R Mehta <sanju.mehta@....com>,
        Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com>,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH 2/9] spi: core: Add flag for controllers that can't hold
 cs between transfers

On Tue, Aug 24, 2021 at 11:40:34AM +0100, Lucas Tanure wrote:
> Create a flag for a controller that has an automatic cs selection and
> can't hold cs activated between transfers
> Some messages send address and data split between two transfers, see
> regmap-spi, and without the cs held the data loses it`s meaning

These controllers just plain can't support multiple transfers in any
useful fashion, the flag name should reflect that as well as being a bit
less long for legibility reasons.

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