linux-kernel - Re: [PATCH v2 0/6] regulator: Fix pbias regulator enable

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Date:	Thu, 3 Sep 2015 14:51:27 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Tony Lindgren <tony@...mide.com>,
	Mark Brown <broonie@...nel.org>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Paweł Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-omap <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH v2 0/6] regulator: Fix pbias regulator enable

Hi,

On Thursday 03 September 2015 01:09 PM, Ulf Hansson wrote:
> +Olof
> 
> On 3 September 2015 at 08:50, Kishon Vijay Abraham I <kishon@...com> wrote:
>> vsel_reg and enable_reg of the pbias regulator descriptor should actually
>> have the offset from syscon.
>>
>> However after
>> "ARM: dts: <platform>: add minimal l4 bus layout with control module
>> support"
>> vsel_reg and enable_reg started to have the absolute address because
>> of address translation that happens due to pbias node made as the
>> child node of syscon. This breaks the pbias regulator enable.
>>
>> This series adds the 'offset' to be populated in vsel_reg and enable_reg
>> in the pbias driver itself.
>>
>> Changes from v1:
>> *) Fixed Tony's review comments on adding a 'comment' for adding offset in
>>    the driver and adding a warning for using platform_get_resource.
>> *) Added Tony's Acked-by.
>>
>> Tested these patches against mmc -next in omap4 panda, omap3 beagle xm,
>> dra72 and omap5 uevm
>>
>> Kishon Vijay Abraham I (6):
>>   regulator: pbias: program pbias register offset in pbias driver
>>   ARM: dts: dra7: use "ti,pbias-dra7" compatible string for pbias
>>   ARM: dts: omap243x: use "ti,pbias-omap2" compatible string for pbias
>>   ARM: dts: omap3: use "ti,pbias-omap3" compatible string for pbias
>>   ARM: dts: omap4: use "ti,pbias-omap4" compatible string for pbias
>>   ARM: dts: omap5: use "ti,pbias-omap5" compatible string for pbias
>>
>>  .../bindings/regulator/pbias-regulator.txt         |    7 ++-
>>  arch/arm/boot/dts/dra7.dtsi                        |    2 +-
>>  arch/arm/boot/dts/omap2430.dtsi                    |    2 +-
>>  arch/arm/boot/dts/omap3.dtsi                       |    2 +-
>>  arch/arm/boot/dts/omap4.dtsi                       |    2 +-
>>  arch/arm/boot/dts/omap5.dtsi                       |    2 +-
>>  drivers/regulator/pbias-regulator.c                |   56 +++++++++++++++++---
>>  7 files changed, 61 insertions(+), 12 deletions(-)
>>
>> --
>> 1.7.9.5
>>
> 
> I have recently queued another patchset [1] for the mmc omap driver
> for 4.3 through my mmc tree for which Olof Johansson reported a
> regression [2] for Panda ES with multi_v7_defconfig.

I generally perform my tests with omap2plus_defconfig and without this
series MMC doesn't work with omap2plus_defconfig.
> 
> Kishon, could you please clarify if $subject patchset solves that
> regression reported by Olof? Or perhaps Olof can run a test?

Just checked multi_v7_defconfig and this series is definitely required
to get MMC working. But we also have to enable 'CONFIG_REGULATOR_PBIAS'
which is not enabled by default in multi_v7_defconfig.

So we should have a patch to enable 'CONFIG_REGULATOR_PBIAS' in
multi_v7_defconfig to completely solve the problem reported by Olof.
I'll prepare a patch for multi_v7_defconfig and post it asap.

Thanks
Kishon

> 
> Finally, perhaps it's better if we queue this through my mmc tree
> since we would then be able to avoid the regression - if I put
> $subject patchset before [1], right? Then I need an ack from Mark for
> the regulator patch.
> Please tell me if you guys prefer another way.
> 
> Kind regards
> Uffe
> 
> [1]
> http://permalink.gmane.org/gmane.linux.kernel/2027789
> 
> [2]
> http://www.spinics.net/lists/linux-mmc/msg33146.html
> 
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