linux-kernel - Re: [PATCH v3 1/2] SPI: Add driver for Cadence SPI controller

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Date:	Fri, 11 Apr 2014 09:06:52 +0530
From:	Harini Katakam <harinikatakamlinux@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, linux-spi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	michals@...inx.com
Subject: Re: [PATCH v3 1/2] SPI: Add driver for Cadence SPI controller

Hi Mark,

On Fri, Apr 11, 2014 at 4:18 AM, Mark Brown <broonie@...nel.org> wrote:
> On Thu, Apr 10, 2014 at 05:43:49PM +0530, Harini Katakam wrote:
>> Add driver for Cadence SPI controller. This is used in Xilinx Zynq.
>
> This looks mostly good, the issues below are very small.
>
>> +static int __maybe_unused cdns_spi_suspend(struct device *dev)
>> +{
>> +     struct platform_device *pdev = container_of(dev,
>> +                     struct platform_device, dev);
>> +     struct spi_master *master = platform_get_drvdata(pdev);
>> +     struct cdns_spi *xspi = spi_master_get_devdata(master);
>> +
>> +     spi_master_suspend(master);
>> +
>> +     clk_disable(xspi->ref_clk);
>> +
>> +     clk_disable(xspi->pclk);
>
> You're only doing clk_disable() here, I would expect the clocks to also
> be unprepared over suspend - there is no value in leaving them prepared
> that I can see.  Just use clk_unprepare_disable().
>
> It would also be good (though not essential) to implement runtime PM and
> disable the clocks while there are no transfers in progress for a small
> power saving.  The auto_runtime_pm feature in the core will do the
> runtime PM calls for you.
>
> Otherwise this looks good.

Thanks. I'll make these changes and send a v4 next week.

Regards,
Harini
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