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dt-bindings: sdhci-omap: Add properties for using external dma 

sdhci-omap can support both external dma controller via dmaengine
framework as well as ADMA which standard SD host controller
provides. Add binding documentation for these external dma properties.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200116105154.7685-2-faiz_abbas@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chunyan Zhang 2020-01-16 16:21:45 +05:30 committed by Ulf Hansson
parent 2aae18f65f
commit 83a1b4cc80
1 changed files with 9 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/sdhci-omap.txt
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@ -15,6 +15,13 @@ Required properties:
"hs200_1_8v", "hs200_1_8v",
- pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt - pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
Optional properties:
- dmas: List of DMA specifiers with the controller specific format as described
in the generic DMA client binding. A tx and rx specifier is required.
- dma-names: List of DMA request names. These strings correspond 1:1 with the
DMA specifiers listed in dmas. The string naming is to be "tx"
and "rx" for TX and RX DMA requests, respectively.
Example: Example:
mmc1: mmc@4809c000 { mmc1: mmc@4809c000 {
compatible = "ti,dra7-sdhci"; compatible = "ti,dra7-sdhci";
@ -22,4 +29,6 @@ Example:
ti,hwmods = "mmc1"; ti,hwmods = "mmc1";
bus-width = <4>; bus-width = <4>;
vmmc-supply = <&vmmc>; /* phandle to regulator node */ vmmc-supply = <&vmmc>; /* phandle to regulator node */
dmas = <&sdma 61 &sdma 62>;
dma-names = "tx", "rx";
}; };