linux-kernel - Re: [PATCH v6 1/4] Runtime Interpreted Power Sequences

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Date:	Thu, 13 Sep 2012 09:54:09 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Alex Courbot <acourbot@...dia.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Leela Krishna Amudala <l.krishna@...sung.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v6 1/4] Runtime Interpreted Power Sequences

On Thu, 2012-09-13 at 15:36 +0900, Alex Courbot wrote:
> On Thursday 13 September 2012 14:22:57 Tomi Valkeinen wrote:
>  
> > However, I fear these board specific things may be quite a bit anything,
> > so it may well be pwm, gpios and regulators are not enough for them. For
> > example, there could be an FPGA on the board which requires some
> > configuration to accomplish the task at hand. It could be rather
> > difficult to handle it with a generic power sequence.
> 
> Right. Note that this framework is supposed to be extended - I would like to 
> at least add regulator voltage setting, and maybe even support for clocks and 
> pinmux (but that might be out of place).

Yes, that's one concern of mine... I already can imagine someone
suggesting adding conditionals to the power sequence data. Perhaps also
direct memory read/writes so you can twiddle registers directly. And so
on. Where's the limit what it should contain? Can we soon write full
drivers with the DT data? =)

 Tomi


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