linux-kernel - Re: [PATCH RFC 0/5] *** SPI Slave mode support ***

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Message-ID: <20170524172940.6vypisacs3rmmjws@sirena.org.uk>
Date:   Wed, 24 May 2017 18:29:40 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jiada Wang <jiada_wang@...tor.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-spi <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RFC 0/5] *** SPI Slave mode support ***

On Wed, Apr 26, 2017 at 11:43:18PM -0700, Jiada Wang wrote:

> The reason I gave the example use case is want to point out that
> with Geert's patch set, a SPI device (with only one controller) can no
> longer
> act as master and slave at the same time. because IMO as a SPI core
> function,
> it needs to cover all the use cases, and to be as generic as possible.

> BUT if you think the use case don't need to be supported from SPI core,
> then I don't have objection either, I will only submit imx SPI slave support
> patch,
> after your SPI slave support patch set been applied

I think there's a bunch of other problems with how that works reliably
that'd need to be addressed before someone could actually do that, and
it seems like such hardware will be very unusual.

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