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mmc: dt-bindings: Add reg/source_cg/latch-ck for Mediatek MMC bindings 

Change the comptiable for support of multi-platform
Make compatible explicit, as MMC host of mt8173 has difference with
mt8135(mt8173 supports hs400 and hs400_tune),so that need separate
mt8173/mt8135 compatible name.
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@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Tested-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chaotian Jing 2017-10-16 09:46:28 +08:00 committed by Ulf Hansson
parent 361eeda0ca
commit d91ca84ede
1 changed files with 15 additions and 3 deletions
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18
Documentation/devicetree/bindings/mmc/mtk-sd.txt
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@ -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 +38,10 @@ 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)
Valid range = [0:0x7]. if not present, default value is 0.
applied to compatible "mediatek,mt2701-mmc".
Examples:
mmc0: mmc@11230000 {