linux-kernel - Re: [PATCH v3 1/2] regulator: s5m8767: Use GPIO for controlling Buck9/eMMC

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Message-ID: <20140124160314.GB27911@lee--X1>
Date:	Fri, 24 Jan 2014 16:03:14 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Sangbeom Kim <sbkim73@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v3 1/2] regulator: s5m8767: Use GPIO for controlling
 Buck9/eMMC

On Fri, 24 Jan 2014, Krzysztof Kozlowski wrote:

> Add support for GPIO control (enable/disable) over Buck9. The Buck9
> Converter is used as a supply for eMMC Host Controller.
> 
> BUCK9EN GPIO of S5M8767 chip may be used by application processor to
> enable or disable the Buck9. This has two benefits:
>  - It is faster than toggling it over I2C bus.
>  - It allows disabling the regulator during suspend to RAM; The AP will
>    enable it during resume; Without the patch the regulator supplying
>    eMMC must be defined as fixed-regulator.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  drivers/regulator/s5m8767.c         |   87 +++++++++++++++++++++++++++++++++--
>  include/linux/mfd/samsung/core.h    |    3 +-
>  include/linux/mfd/samsung/s5m8767.h |    7 +++
>  3 files changed, 93 insertions(+), 4 deletions(-)

For the MFD changes:
  Acked-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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