Re: [PATCH 01/12] mmc: dt-bindings: update Mediatek MMC bindings

From: Chaotian Jing <chaotian.jing@mediatek.com>
To: Rob Herring <robh@kernel.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	"yong mao" <yong.mao@mediatek.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Javier Martinez Canillas <javier@osg.samsung.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Phong LE <ple@baylibre.com>, <linux-mmc@vger.kernel.org>,
	<devicetree@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <srv_heupstream@mediatek.com>
Subject: Re: [PATCH 01/12] mmc: dt-bindings: update Mediatek MMC bindings
Date: Thu, 14 Sep 2017 10:10:21 +0800	[thread overview]
Message-ID: <1505355021.8308.4.camel@mhfsdcap03> (raw)
In-Reply-To: <20170913141026.43oh4n4foipmahsk@rob-hp-laptop>

On Wed, 2017-09-13 at 09:10 -0500, Rob Herring wrote:
> On Tue, Sep 12, 2017 at 05:07:41PM +0800, Chaotian Jing wrote:
> > Change the comptiable for support of multi-platform
> > Add description for reg
> > Add description for source_cg
> > Add description for mediatek,latch-ck
> 
> This is at least the 3rd patch with exactly the same vague subject. 
> Please make the subject somewhat unique.
> 
Thx, will change the subject at next version
> > 
> > Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
> > ---
> >  Documentation/devicetree/bindings/mmc/mtk-sd.txt | 13 ++++++++++---
> >  1 file changed, 10 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> > index 4182ea3..405cd06 100644
> > --- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> > +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> > @@ -7,10 +7,15 @@ This file documents differences between the core properties in mmc.txt
> >  and the properties used by the msdc driver.
> >  
> >  Required properties:
> > -- compatible: Should be "mediatek,mt8173-mmc","mediatek,mt8135-mmc"
> > +- compatible: value should be either of the following.
> > +	"mediatek,mt8135-mmc": for mmc host ip compatible with mt8135
> > +	"mediatek,mt8173-mmc": for mmc host ip compatible with mt8173
> > +	"mediatek,mt2701-mmc": for mmc host ip compatible with mt2701
> > +	"mediatek,mt2712-mmc": for mmc host ip compatible with mt2712
> > +- reg: physical base address of the controller and length
> >  - interrupts: Should contain MSDC interrupt number
> > -- clocks: MSDC source clock, HCLK
> > -- clock-names: "source", "hclk"
> > +- clocks: MSDC source clock, HCLK, source_cg
> > +- clock-names: "source", "hclk", "source_cg"
> 
> All chips support source_cg? That's not backwards compatible for 
> existing compatible strings if the driver requires it.
Not all chips support source_cg, for chips which do not support
source_cg, no need source_cg here, and the driver will parse it
to know if current chip support it.
> 
> >  - pinctrl-names: should be "default", "state_uhs"
> >  - pinctrl-0: should contain default/high speed pin ctrl
> >  - pinctrl-1: should contain uhs mode pin ctrl
> > @@ -30,6 +35,8 @@ Optional properties:
> >  - mediatek,hs400-cmd-resp-sel-rising:  HS400 command response sample selection
> >  				       If present,HS400 command responses are sampled on rising edges.
> >  				       If not present,HS400 command responses are sampled on falling edges.
> > +- mediatek,latch-ck: Some projects do not support enhance_rx, need set correct latch-ck to avoid data crc
> 
> What's a project?
eg, MT2701
> 
> > +		     error caused by stop clock(fifo full)
> >  
> >  Examples:
> >  mmc0: mmc@11230000 {
> > -- 
> > 1.8.1.1.dirty
> >