linux-kernel - Re: [PATCH v4] spi: dts: sun4i: Add support for wait time between word transmissions

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Message-ID: <CAGNoLaN=HJ-OR6oFiGWC58DG+w1A9qeEVyGBRb1vdf9BRNW=Rg@mail.gmail.com>
Date:	Thu, 17 Dec 2015 12:22:49 +0100
From:	Marcus Weseloh <mweseloh42@...il.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
	"Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4] spi: dts: sun4i: Add support for wait time between
 word transmissions

Hi Maxime,

2015-12-16 11:39 GMT+01:00 Maxime Ripard <maxime.ripard@...e-electrons.com>:
> It looks mostly fine, however, please try to make only one thing in
> one patch.
>
> In this case, it would mean having one patch to add the DT property
> and support in the SPI core in a first one, and then add support for
> it in your driver.

Will do.

> I also have a minor comment below....
[...]
>> +     if (spi->word_wait_ns) {
>> +             clk_ns = DIV_ROUND_UP(1000000000, tfr->speed_hz);
>> +             wait_clk = DIV_ROUND_UP(spi->word_wait_ns, clk_ns) - 3;
>> +             if (wait_clk < 1) {
>> +                     wait_clk = 1;
>> +                     dev_info(&spi->dev,
>> +                              "using minimum of 4 word wait cycles (%uns)",
>> +                              4 * clk_ns);
>
> Logging it at the info loglevel seems a bit too high. debug seems more
> appropriate.

I will change it to debug and send a new version.

Thanks for the review!

Marcus
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