linux-kernel - Re: [PATCH] spi: spi-geni-qcom: Add SPI driver support for GENI based QUP

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Message-ID: <20180524162940.GA4828@sirena.org.uk>
Date:   Thu, 24 May 2018 17:29:40 +0100
From:   Mark Brown <broonie@...nel.org>
To:     "Mahadevan, Girish" <girishm@...eaurora.org>
Cc:     Stephen Boyd <swboyd@...omium.org>, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, sdharia@...eaurora.org,
        kramasub@...eaurora.org, dianders@...omium.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] spi: spi-geni-qcom: Add SPI driver support for GENI
 based QUP

On Thu, May 24, 2018 at 10:25:58AM -0600, Mahadevan, Girish wrote:

> The reason I have the cur_speed_hz is that there is a max_speed_hz which
> is the max frequency the slave can do; but every transfer can also
> specify a speed_hz and override this.

Every transfer *will* specify a speed, you should never see a transfer
that doesn't specify a speed.

> > delay_usecs is for inter-transfer delays within a message rather than
> > after the initial chip select assert (it can be used to keep chip select
> > asserted for longer after the final transfer too).  Obviously this is
> > also something that shouldn't be configured in a driver specific
> > fashion.

> Hmmm ok, so you mean don't send these as controller_data, rather add new
> members to the spi_device struct ?

Yes, that'd be one way to do it.

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