linux-kernel - Re: [PATCH resend 1/2] spi: add driver for ar934x spi controller

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Message-ID: <20200206135403.GP3897@sirena.org.uk>
Date:   Thu, 6 Feb 2020 13:54:03 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Chuanhong Guo <gch981213@...il.com>
Cc:     linux-spi@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH resend 1/2] spi: add driver for ar934x spi controller

On Thu, Feb 06, 2020 at 08:33:33PM +0800, Chuanhong Guo wrote:
> On Thu, Feb 6, 2020 at 8:30 PM Chuanhong Guo <gch981213@...il.com> wrote:

> > Chipselect is also handled during transfer. Controller asserts
> > corresponding chipselect in SHIFT_CTRL register, and if SHIFT_TERM bit
> > is set, controller will deassert chipselect after current transfer is
> > done. I need to know whether this is the last transfer and set
> > SHIFT_TERM accordingly.

> Oh, I remembered that I saw transfer_one function name somewhere and
> thought maybe I could shorten the function name a bit. I'll correct
> this back to ar934x_spi_transfer_one_message in v2.

OK, sounds good - I see the chip select handling now.

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