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From: Flora Fu <flora.fu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
	Matthias Brugger
	<matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Samuel Ortiz <sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Liam Girdwood <lgirdwood-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	arm-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
	srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	HenryC Chen <henryc.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	Menghui Lin <menghui.lin-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>,
	Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Grant Likely
	<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Yingjoe Chen
	<yingjoe.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	Eddie Huang <eddie.huang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
	Dongdong Cheng
	<dongdong.cheng-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH v3 1/8] soc: mediatek: Add PMIC wrapper for MT8135 and MT6397 SoC
Date: Tue, 9 Dec 2014 10:15:37 +0800	[thread overview]
Message-ID: <1418091337.5663.9.camel@mtksdaap41> (raw)
In-Reply-To: <2751641.o51TuZRl88@wuerfel>

Hi, Arnd,

On Fri, 2014-12-05 at 11:13 +0100, Arnd Bergmann wrote:
> On Friday 05 December 2014 12:07:52 Flora Fu wrote:
> > Add PMIC wrapper of MT8135 to access MT6397 MFD.
> > 
> > Signed-off-by: Flora Fu <flora.fu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> > 
> 
> Please explain what a PMIC wrapper is and why you need one for MT8135.
> I don't understand the purpose of this code at all. Is this just another
> way of accessing the MT6397 when not using i2c or spi like other
> PMIC drivers do?
> 

Yes, MT8135 uses a proprietary hardware to communicate with MT6397. 
The hardware is called PMIC Wrapper or PWRAP.
Since it is not standard i2c or spi protocols, a soc related software
driver is implemented to handle access protocols in AP side.

+-----------------+           +---------------+
|                 |           |               |
| Mediatek AP SoC |           |               |
| (ex. MT8135)    |           |    MT6397     |
|                 |           |               |
|      +--------+ | (SPI bus) | +--------+    |
|      |        | |-----------| |        |    |
|      |  PMIC  | |-----------| |  PMIC  |    |
|      | Wrapper| |-----------| | Wrapper|    |
|      |        | |-----------| |        |    |
|      +--------+ |           | +--------+    |
|                 |           |               |
+-----------------+           +---------------+

Thanks,
Flora


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  reply	other threads:[~2014-12-09  2:15 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-05  4:07 [PATCH v3 0/8] Add Support for MediaTek PMIC MT6397 MFD Core and Regulator Flora Fu
2014-12-05  4:07 ` [PATCH v3 1/8] soc: mediatek: Add PMIC wrapper for MT8135 and MT6397 SoC Flora Fu
     [not found]   ` <1417752479-4749-2-git-send-email-flora.fu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2014-12-05 10:13     ` Arnd Bergmann
2014-12-09  2:15       ` Flora Fu [this message]
2014-12-09  8:23         ` Arnd Bergmann
2014-12-09 10:13           ` Sascha Hauer
     [not found]             ` <20141209101341.GV30369-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-12-09 10:30               ` Matthias Brugger
     [not found]                 ` <CABuKBe+whgVryssULCu2MAXRu3u+pYwM2nN3ToTEGpEvniQ6Jw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-12-09 11:20                   ` Arnd Bergmann
2014-12-11 10:04                     ` Flora Fu
2014-12-14 20:18                       ` Arnd Bergmann
2014-12-15 17:22                       ` Mark Brown
     [not found] ` <1417752479-4749-1-git-send-email-flora.fu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2014-12-05  4:07   ` [PATCH v3 2/8] mfd: MT6397: Add support for PMIC MT6397 MFD Flora Fu
     [not found]     ` <1417752479-4749-3-git-send-email-flora.fu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2014-12-08  8:46       ` Lee Jones
2014-12-05  4:07 ` [PATCH v3 3/8] regulator: MT6397: Add support for MT6397 regulator Flora Fu
2014-12-24 12:41   ` Mark Brown
2014-12-05  4:07 ` [PATCH v3 4/8] dt-bindings:: Add document for MT8135 PMIC Wrapper Flora Fu
2014-12-05  4:07 ` [PATCH v3 5/8] dt-bindings: Add document for MT6397 MFD Flora Fu
2014-12-05  4:07 ` [PATCH v3 6/8] dt-bindings: Add document for MT6397 regulator Flora Fu
2014-12-24 12:41   ` Mark Brown
2014-12-05  4:07 ` [PATCH v3 7/8] ARM: dts: mt8135: Add support for MT8135 PMIC wrapper Flora Fu
2014-12-05  4:07 ` [PATCH v3 8/8] ARM: dts: mt8135: Add support for MT6397 MFD and regulator Flora Fu

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