linux-kernel - Re: [PATCH v5 01/12] mmc: dt-bindings: Add reg/source

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Date:   Fri, 13 Oct 2017 16:50:16 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chaotian Jing <chaotian.jing@...iatek.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        yong mao <yong.mao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Phong LE <ple@...libre.com>, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        srv_heupstream@...iatek.com
Subject: Re: [PATCH v5 01/12] mmc: dt-bindings: Add reg/source_cg/latch-ck
 for Mediatek MMC bindings

On Wed, Oct 11, 2017 at 10:41:25AM +0800, Chaotian Jing wrote:
> Change the comptiable for support of multi-platform
> Make compatible explicit
> Add description for reg
> Add description for source_cg
> Add description for mediatek,latch-ck
> Note that source_cg and mediatek,latch-ck are optional for some projects,
> eg, MT2701 do not have source_cg, and MT2712 do not need
> mediatek,latch-ck
> 
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> ---
>  Documentation/devicetree/bindings/mmc/mtk-sd.txt | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> index 4182ea3..2bb585b 100644
> --- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> @@ -7,10 +7,18 @@ 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: Should contain phandle for the clock feeding the MMC controller
> +- clock-names: Should contain the following:
> +	"source" - source clock (required)
> +	"hclk" - HCLK which used for host (required)
> +	"source_cg" - independent source clock gate (required for MT2712)
>  - 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 +38,8 @@ 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 SoCs do not support enhance_rx, need set correct latch-ck to avoid data crc
> +		     error caused by stop clock(fifo full)

What values are supported? What's the default if not present.

Be clear what compatible strings this property applies to or doesn't 
apply to.

Rob