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

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Date:	Thu, 13 Sep 2012 09:37:23 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Alex Courbot <acourbot@...dia.com>
CC:	Tomi Valkeinen <tomi.valkeinen@...com>,
	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 09/13/2012 01:08 AM, Alex Courbot wrote:
> On Thursday 13 September 2012 14:54:09 Tomi Valkeinen wrote:
>> * PGP Signed by an unknown key
>>
>> 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.
> 
> I took care of that when naming the feature - it is not a "sequence" anymore 
> if you have conditionals. :P
> 
>> 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? =)
> 
> I shall be satisfied the day the kernel is released as one big DT node along 
> with the 5KB interpreter that runs it.

I know you're joking, but *cough* OpenFirmware *cough*, right?
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