linux-kernel - Re: [PATCH v2 17/17] soc/tegra: remove lagacy powergate APIs

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Date:	Thu, 12 Mar 2015 21:11:52 +0800
From:	Vince Hsu <vinceh@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	<pdeschrijver@...dia.com>, <swarren@...dotorg.org>,
	<gnurou@...il.com>, <jroedel@...e.de>, <p.zabel@...gutronix.de>,
	<mturquette@...aro.org>, <pgaikwad@...dia.com>,
	<sboyd@...eaurora.org>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <linux@....linux.org.uk>,
	<tbergstrom@...dia.com>, <airlied@...ux.ie>, <bhelgaas@...gle.com>,
	<tj@...nel.org>, <arnd@...db.de>, <robh@...nel.org>,
	<will.deacon@....com>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<rjw@...ysocki.net>, <viresh.kumar@...aro.org>
Subject: Re: [PATCH v2 17/17] soc/tegra: remove lagacy powergate APIs

Hi,

On 03/12/2015 08:45 PM, Thierry Reding wrote:
> * PGP Signed by an unknown key
>
> On Thu, Mar 12, 2015 at 08:15:18PM +0800, Vince Hsu wrote:
>> We switch to generic power domain now. So remove the legacy functions.
>>
>> Signed-off-by: Vince Hsu <vinceh@...dia.com>
>> ---
>>   drivers/soc/tegra/pmc.c | 68 -------------------------------------------------
>>   include/soc/tegra/pmc.h | 22 ----------------
>>   2 files changed, 90 deletions(-)
> I don't think we can do this. What if somebody updates their kernel but
> not the DTB? In that case they'll end up with drivers that don't enable
> power partitions but at the same time the powergate driver won't enable
> them either because it is missing the corresponding nodes in the DTB.
You're right.

>
> What we'll have to do is probably keep the code that enables the power
> partitions and make it conditional on the power domains somehow. Is
> there a way to determine at runtime whether a device has been attached
> to a power domain?
>
Yes, we can check if a power domain is bound to the GPD by DT in the 
legacy powergate code.

Thanks,
Vince
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