linux-kernel - Re: [PATCH/RFC v2] ARM: amba: Remove AMBA level regulator support

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Date:	Fri, 6 Apr 2012 15:49:45 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-arm-kernel@...ts.infradead.org,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC v2] ARM: amba: Remove AMBA level regulator support

On Sun, Apr 01, 2012 at 07:58:40PM +0100, Mark Brown wrote:
> The AMBA bus regulator support is being used to model on/off switches
> for power domains which isn't terribly idiomatic for modern kernels with
> the generic power domain code and creates integration problems on platforms
> which don't use regulators for their power domains as it's hard to tell
> the difference between a regulator that is needed but failed to be provided
> and one that isn't supposed to be there (though DT does make that easier).
> 
> Platforms that wish to use the regulator API to manage their power domains
> can indirect via the power domain interface.
> 
> This feature is only used with the vape supply of the db8500 PRCMU
> driver which supplies the UARTs and MMC controllers, none of which have
> support for managing vcore at runtime in mainline (only pl022 SPI
> controller does).  Update that supply to have an always_on constraint
> until the power domain support for the system is updated so that it is
> enabled for these users, this is likely to have no impact on practical
> systems as probably at least one of these devices will be active and
> cause AMBA to hold the supply on anyway.
> 
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>

Tested-by: Shawn Guo <shawn.guo@...aro.org>

Russell,

I believe this patch fixes the amba probe failure that impacts any
AMBA platform build with CONFIG_REGULATOR enabled.  Could you consider
to send the fix for -rc soon?

The patch "ARM: amba: adapt to regulator probe deferral change" from
me could be ignored now.

-- 
Regards,
Shawn
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