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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. and the properties used by the msdc driver.
Required properties: 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 - interrupts: Should contain MSDC interrupt number
- clocks: MSDC source clock, HCLK - clocks: Should contain phandle for the clock feeding the MMC controller
- clock-names: "source", "hclk" - 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-names: should be "default", "state_uhs"
- pinctrl-0: should contain default/high speed pin ctrl - pinctrl-0: should contain default/high speed pin ctrl
- pinctrl-1: should contain uhs mode 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 - mediatek,hs400-cmd-resp-sel-rising: HS400 command response sample selection
If present,HS400 command responses are sampled on rising edges. If present,HS400 command responses are sampled on rising edges.
If not present,HS400 command responses are sampled on falling 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: Examples:
mmc0: mmc@11230000 { mmc0: mmc@11230000 {