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

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Date:   Tue, 14 Aug 2018 16:03:40 +0100
From:   Mark Brown <broonie@...nel.org>
To:     dkota@...eaurora.org
Cc:     Doug Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Sagar Dharia <sdharia@...eaurora.org>,
        Karthikeyan Ramasubramanian <kramasub@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "Mahadevan, Girish" <girishm@...eaurora.org>
Subject: Re: [PATCH] spi: spi-geni-qcom: Add SPI driver support for GENI
 based QUP

On Tue, Aug 14, 2018 at 02:30:02PM +0530, dkota@...eaurora.org wrote:
> On 2018-08-10 22:16, Mark Brown wrote:
> > On Fri, Aug 10, 2018 at 09:59:46PM +0530, dkota@...eaurora.org wrote:

> > > 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 ?

> spi_cs_clk_delay -> Adds Delay from CS line toggle to Clock line toggle
> spi_inter_words_delay -> Adds inter-word delay for each transfer.

> Could you please provide more information on accommodating these
> parameters in SPI core structures like spi_device or spi_transfer? Why
> because these are very
> specific to Qualcomm SPI GENI controller.

I'm not sure what specific information you're looking for here - these
things are not obviously specific to your controller, I'm even aware of
other controllers which can do them.

> If we define them in spi core framework structures, SPI Slave driver will
> program and expect it in the SPI transfers.

Sure.

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