linux-kernel - Re: [PATCH v4 3/3] memory: tegra124-emc: Add EMC driver

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Message-ID: <53FD8975.3050706@collabora.com>
Date:	Wed, 27 Aug 2014 09:32:05 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>
CC:	linux-pm@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>,
	Terje Bergström <tbergstrom@...dia.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: Re: [PATCH v4 3/3] memory: tegra124-emc: Add EMC driver

On 08/26/2014 07:17 PM, Stephen Warren wrote:
> On 08/26/2014 07:12 AM, Tomeu Vizoso wrote:
>> Sets the EMC clock rate based on the bandwidth requirements registered by
>> memory clients through the PM_QOS_MEMORY_BANDWIDTH class.
>>
>> Note: this is just an example and not a proper driver for a external
>> memory
>> controller. Its only purpose is to illustrate how such a driver would
>> set the
>> frequency of the external memory clock based on the bandwidth
>> requirements of
>> memory clients.
>
>> diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c
>
>> @@ -112,6 +117,11 @@ static void __init tegra_dt_init(void)
>>       parent = soc_device_to_device(soc_dev);
>>
>>       /*
>> +     * HACK: register a platform device to probe the driver
>> +     */
>> +    platform_device_register(&tegra_emc);
>
> I don't think this is a hack, except for the bug: That should only
> happen on Tegra124 not on all Tegra SoCs.
>
> Do you intend all 3 patches in this series to be merged? You'd mentioned
> you didn't when asked about this for a previous version. I'm not sure if
> that's changed?

Yeah, I don't want 3/3 merged because we don't have a functional EMC 
clock yet on T124, and because I don't know yet where will be the best 
place to have that code in. That depends on Mikko's work on the real EMC 
driver which is in a bit of flux right now.

I have kept posting it just because I think it complements nicely the 
explanation in the cover letter, but maybe confuses more than helps.

Regards,

Tomeu

> To merge, I'd need Thierry's ack on patch 2, and Thierry's, Peter's,
> Mikko's, and/or Tuomas's on this patch.

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