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From: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
To: Mark Brown
	<broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Andrew Chew <achew-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	romain.naour-oid7hba3+9NWj0EZb7rXcA@public.gmane.org,
	kgene.kim-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org,
	drwyrm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	stefan-WB6LKoYH/xlAfugRpC6u6w@public.gmane.org,
	laforge-WB6LKoYH/xlAfugRpC6u6w@public.gmane.org,
	philipp.zabel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	lost.distance-/E1597aS9LQAvxtiuMwx3w@public.gmane.org,
	robert.jarzmik-GANU6spQydw@public.gmane.org,
	eric.y.miao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
	haojian.zhuang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	kyungmin.park-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org,
	gxt-TG0Ac1+ktVePQbnJrJN+5g@public.gmane.org,
	shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
	linux-ci5G2KO2hbZ+pU9mqzGVBQ@public.gmane.org,
	thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org,
	acourbot-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org,
	linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	openezx-devel-ZwoEplunGu3n3BO9LpVK+9i2O/JbrIOy@public.gmane.org,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [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-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>

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

WARNING: multiple messages have this Message-ID (diff)
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

  parent reply	other threads:[~2013-03-20 14:03 UTC|newest]

Thread overview: 54+ 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 ` Andrew Chew
     [not found] ` <1363719573-20926-1-git-send-email-achew-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
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     ` Andrew Chew
2013-03-19 18:59   ` [PATCH V4 2/9] ARM: S3C24XX: " Andrew Chew
2013-03-19 18:59     ` Andrew Chew
2013-03-19 18:59   ` [PATCH V4 4/9] ARM: EXYNOS: " Andrew Chew
2013-03-19 18:59     ` Andrew Chew
2013-03-19 18:59   ` [PATCH V4 5/9] unicore32: " Andrew Chew
2013-03-19 18:59     ` Andrew Chew
2013-03-19 18:59   ` [PATCH V4 6/9] ARM: mxs: " Andrew Chew
2013-03-19 18:59     ` Andrew Chew
2013-03-19 21:27     ` Marek Vasut
2013-03-19 21:27       ` Marek Vasut
2013-03-19 21:31       ` Andrew Chew
2013-03-19 21:31         ` Andrew Chew
2013-03-19 21:35         ` Marek Vasut
2013-03-19 21:35           ` Marek Vasut
     [not found]       ` <201303192227.21717.marex-ynQEQJNshbs@public.gmane.org>
2013-03-19 22:10         ` Stephen Warren
2013-03-19 22:10           ` Stephen Warren
2013-03-20  8:23           ` Mark Brown
2013-03-20  8:23             ` Mark Brown
     [not found]             ` <20130320082318.GA28775-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
2013-03-20 14:03               ` Marek Vasut [this message]
2013-03-20 14:03                 ` Marek Vasut
2013-03-20  3:13     ` Shawn Guo
2013-03-20  3:13       ` Shawn Guo
2013-03-19 18:59   ` [PATCH V4 7/9] ARM: vt8500: " Andrew Chew
2013-03-19 18:59     ` Andrew Chew
2013-03-20 18:18     ` [Bulk] " Tony Prisk
2013-03-20 18:18       ` Tony Prisk
2013-03-19 18:59   ` [PATCH V4 8/9] ARM: tegra: " Andrew Chew
2013-03-19 18:59     ` Andrew Chew
2013-03-21 20:01     ` Stephen Warren
2013-03-21 20:01       ` Stephen Warren
     [not found]     ` <1363719573-20926-9-git-send-email-achew-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-03-22 10:29       ` Thierry Reding
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
2013-03-19 18:59     ` Andrew Chew
     [not found]     ` <1363719573-20926-10-git-send-email-achew-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-03-20 18:00       ` Stephen Warren
2013-03-20 18:00         ` Stephen Warren
     [not found]         ` <5149F92A.3070004-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-03-20 22:19           ` Thierry Reding
2013-03-20 22:19             ` Thierry Reding
2013-03-19 18:59 ` [PATCH V4 3/9] ARM: pxa: Provide regulator to pwm-backlight Andrew Chew
2013-03-19 18:59   ` Andrew Chew
2013-03-20  2:14 ` [PATCH V4 0/9] Add mandatory regulator for all users of pwm-backlight Shawn Guo
2013-03-20  2:14   ` Shawn Guo
2013-03-20  2:24   ` Alex Courbot
2013-03-20  2:24     ` Alex Courbot
2013-03-20  3:08     ` Shawn Guo
2013-03-20  3:08       ` Shawn Guo
2013-03-20  7:13     ` Tony Prisk
2013-03-20  7:13       ` Tony Prisk
2013-03-22  1:57 ` Alex Courbot
2013-03-22  1:57   ` Alex Courbot

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