linux-kernel - RE: [PATCH 1/2] spi: fsi: Reduce max transfer size to 8 bytes

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Date:   Tue, 20 Jul 2021 17:32:13 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Mark Brown' <broonie@...nel.org>
CC:     'Eddie James' <eajames@...ux.ibm.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>
Subject: RE: [PATCH 1/2] spi: fsi: Reduce max transfer size to 8 bytes

From: Mark Brown
> Sent: 20 July 2021 14:13
> 
> On Tue, Jul 20, 2021 at 01:04:38PM +0000, David Laight wrote:
> 
> > Having said that, you might want a loop in the driver so that
> > application requests for longer transfers are implemented
> > with multiple hardware requests.
> 
> No, that's something that should be and indeed is done in the core -
> this isn't the only hardware out there with some kind of restriction on
> length.

Ah, ok, there is another loop before any 'users'.
> > I do also wonder why there is support in the main kernel sources
> > for hardware that doesn't actually exist.
> 
> We encourage vendors to get support for their devices upstream prior to
> hardware availability so that users are able to run upstream when they
> get access to hardware, this means users aren't forced to run out of
> tree code needlessly and greatly eases deployment.

This one just seemed a bit premature.

	David

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