linux-kernel - Re: [PATCH 5/7] spi: fsi: Implement restricted size for certain controllers

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Message-ID: <20200820171903.GI5854@sirena.org.uk>
Date:   Thu, 20 Aug 2020 18:19:03 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, joel@....id.au,
        bradleyb@...ziesquirrel.com, robh+dt@...nel.org, arnd@...db.de
Subject: Re: [PATCH 5/7] spi: fsi: Implement restricted size for certain
 controllers

On Thu, Aug 20, 2020 at 12:02:26PM -0500, Eddie James wrote:
> Some of the FSI-attached SPI controllers cannot use the loop command in
> programming the sequencer due to security requirements. Add a boolean
> devicetree property that describes this condition and restrict the
> size for these controllers. Also, add more transfers directly in the
> sequence up to the length of the sequence register.

If there is one difference between implementations of the controller
there are likely to be more - why have a property here rather than use
compatible strings for the different hardware variants?  Compatible
strings mean that as more differences are discovered existing DTs
continue to work.

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