linux-kernel - Re: [PATCH v1 RFC 1/2] spi: introduce fallback to pio

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Date:   Mon, 15 Jun 2020 15:55:56 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Robin Gong <yibin.gong@....com>
Cc:     Vinod Koul <vkoul@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "matthias.schiffer@...tq-group.com" 
        <matthias.schiffer@...tq-group.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 RFC 1/2] spi: introduce fallback to pio

On Mon, Jun 15, 2020 at 02:53:29PM +0000, Robin Gong wrote:
> On 2020/06/15 22:36 Mark Brown <broonie@...nel.org> wrote: 

> > We could also pass in a flag that could be set separately to the error code to
> > indicate that nothing had happened to the hardware yet.

> Do you mean spi-imx.c checking 'ctlr->flags' before return such error code?
> Or just like below done in spi.c.

No, I mean passing in an additional argument which can provide richer
data than trying to smash things into the return value.

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