From: marex@denx.de (Marek Vasut)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V4 6/9] ARM: mxs: Provide regulator to pwm-backlight
Date: Wed, 20 Mar 2013 15:03:20 +0100 [thread overview]
Message-ID: <201303201503.20480.marex@denx.de> (raw)
In-Reply-To: <20130320082318.GA28775@opensource.wolfsonmicro.com>
Hi Mark,
> On Tue, Mar 19, 2013 at 04:10:26PM -0600, Stephen Warren wrote:
> > On 03/19/2013 03:27 PM, Marek Vasut wrote:
> > > Do we really need a mandatory regulator? Why can't it be optional?
> >
> > IIRC, the previous advice I've seen is that if a device (driver) uses a
> > regulator, it must /require/ a regulator, and if a particular board
> > doesn't actually have a SW-controlled regulator, then a fixed- or dummy-
> > regulator should be provided to satisfy this requirement.
> >
> > CC'ing Mark Brown to make sure I really do Recall Correctly.
>
> Yes, and it should be fixed rather than dummy. The issue is partly that
> it's probably important that the device has power so we don't want to
> just ignore errors and partly that this is something which applies to
> essentially all devices so whatever we do for this case ought to be done
> by the core so all devices can benefit and we don't have to duplicate
> lots of code in individual drivers.
Thanks for clearing this!
Best regards,
Marek Vasut
next prev parent reply other threads:[~2013-03-20 14:03 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-19 18:59 [PATCH V4 0/9] Add mandatory regulator for all users of pwm-backlight Andrew Chew
2013-03-19 18:59 ` [PATCH V4 1/9] ARM: OMAP: board-4430sdp: Provide regulator to pwm-backlight Andrew Chew
2013-03-19 18:59 ` [PATCH V4 2/9] ARM: S3C24XX: " Andrew Chew
2013-03-19 18:59 ` [PATCH V4 3/9] ARM: pxa: " Andrew Chew
2013-03-19 18:59 ` [PATCH V4 4/9] ARM: EXYNOS: " Andrew Chew
2013-03-19 18:59 ` [PATCH V4 5/9] unicore32: " Andrew Chew
2013-03-19 18:59 ` [PATCH V4 6/9] ARM: mxs: " Andrew Chew
2013-03-19 21:27 ` Marek Vasut
2013-03-19 21:31 ` Andrew Chew
2013-03-19 21:35 ` Marek Vasut
2013-03-19 22:10 ` Stephen Warren
2013-03-20 8:23 ` Mark Brown
2013-03-20 14:03 ` Marek Vasut [this message]
2013-03-20 3:13 ` Shawn Guo
2013-03-19 18:59 ` [PATCH V4 7/9] ARM: vt8500: " Andrew Chew
2013-03-20 18:18 ` [Bulk] " Tony Prisk
2013-03-19 18:59 ` [PATCH V4 8/9] ARM: tegra: " Andrew Chew
2013-03-21 20:01 ` Stephen Warren
2013-03-22 10:29 ` Thierry Reding
2013-03-19 18:59 ` [PATCH V4 9/9] pwm_bl: Add mandatory backlight enable regulator Andrew Chew
2013-03-20 18:00 ` Stephen Warren
2013-03-20 22:19 ` Thierry Reding
2013-03-20 2:14 ` [PATCH V4 0/9] Add mandatory regulator for all users of pwm-backlight Shawn Guo
2013-03-20 2:24 ` Alex Courbot
2013-03-20 3:08 ` Shawn Guo
2013-03-20 7:13 ` Tony Prisk
2013-03-22 1:57 ` Alex Courbot
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