From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
Cc: 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,
Mark Brown
<broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
Subject: Re: [PATCH V4 6/9] ARM: mxs: Provide regulator to pwm-backlight
Date: Tue, 19 Mar 2013 16:10:26 -0600 [thread overview]
Message-ID: <5148E252.9050900@wwwdotorg.org> (raw)
In-Reply-To: <201303192227.21717.marex-ynQEQJNshbs@public.gmane.org>
On 03/19/2013 03:27 PM, Marek Vasut wrote:
> Dear Andrew Chew,
>
>> The pwm-backlight driver now takes a mandatory regulator that is gotten
>> during driver probe. Initialize a dummy regulator to satisfy this
>> requirement.
>>
>> Signed-off-by: Andrew Chew <achew-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>
> 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.
WARNING: multiple messages have this Message-ID (diff)
From: swarren@wwwdotorg.org (Stephen Warren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V4 6/9] ARM: mxs: Provide regulator to pwm-backlight
Date: Tue, 19 Mar 2013 16:10:26 -0600 [thread overview]
Message-ID: <5148E252.9050900@wwwdotorg.org> (raw)
In-Reply-To: <201303192227.21717.marex@denx.de>
On 03/19/2013 03:27 PM, Marek Vasut wrote:
> Dear Andrew Chew,
>
>> The pwm-backlight driver now takes a mandatory regulator that is gotten
>> during driver probe. Initialize a dummy regulator to satisfy this
>> requirement.
>>
>> Signed-off-by: Andrew Chew <achew@nvidia.com>
>
> 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.
next prev parent reply other threads:[~2013-03-19 22:10 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
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
[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: " 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 [this message]
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
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
2013-03-20 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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