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

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Message-ID: <53FCC139.6020703@wwwdotorg.org>
Date:	Tue, 26 Aug 2014 11:17:45 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	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 07:12 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?

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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