linux-kernel - Re: [PATCH 2/2] ARM: dts: exynos4412-trats: Add suspend configuration for max77686 regulators

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Date:	Tue, 21 Oct 2014 12:00:18 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>
CC:	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>
Subject: Re: [PATCH 2/2] ARM: dts: exynos4412-trats: Add suspend configuration
 for max77686 regulators

Hello Krzysztof,

On 10/21/2014 11:23 AM, Krzysztof Kozlowski wrote:
>> >  
>> >  				ldo9_reg: ldo9 {
>> > @@ -295,7 +311,9 @@
>> >  					regulator-name = "CAM_ISP_MIPI_1.2V";
>> >  					regulator-min-microvolt = <1200000>;
>> >  					regulator-max-microvolt = <1200000>;
>> > -					regulator-mem-idle;
>> > +					regulator-state-mem {
>> > +						regulator-on-in-suspend;
>> 
>> CAM_ISP_MIPI_1.2V is used for camera, I think this regulator should turn off in suspend state
>> because camear could not be used in suspend state.
> 
> LDO9 does not support off in suspend mode controlled by PWRREQ. It
> supports only switching to low power mode if PWRREQ level goes low.
> 
> Thus the driver does not provide set_suspend_enable or
> set_suspend_disable for LDO0. Do you want to add such function to the
> max77686 driver which will explicitly disable the regulator (write 0x0
> to control reg)?
> 
> 

I think for those regulators you can just use regulator_disable_regmap()
as the .set_suspend_disable function handler?

Best regards,
Javier
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