linux-kernel - Re: [PATCH 1/2] spi: support inter-word delay requirement for devices

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Message-ID: <20190125175031.GA25898@sirena.org.uk>
Date:   Fri, 25 Jan 2019 17:50:31 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jonas Bonn <jonas@...rbonn.se>
Cc:     Baolin Wang <baolin.wang@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] spi: support inter-word delay requirement for devices

On Fri, Jan 25, 2019 at 05:47:13PM +0000, Mark Brown wrote:
> On Fri, Jan 25, 2019 at 01:06:45PM +0100, Jonas Bonn wrote:

> > Having this as device property rather than a transfer property allows this
> > to be configured one time in setup() rather than having to fiddle with the
> > configuration register for every transfer.

> That doesn't mean that the coniguration should be done in DT though, and
> given that this presumably is a property of the device there seems to be
> no reason why we'd have it in DT - if every instance of the device is
> going to need to set the property we should just figure it out from the
> compatble string instead.

To be clear here: the suggestion is to add a parameter the slave device
can set in spi_device which sets the default word_delay similarly to how
max_speed_hz works.

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