linux-kernel - [PATCH 3/7] dt-bindings: sdhci-omap: Add example for using external dma

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Message-ID: <20190111110851.6805-4-faiz_abbas@ti.com>
Date:   Fri, 11 Jan 2019 16:38:47 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>
CC:     <zhang.chunyan@...aro.org>, <kishon@...com>,
        <adrian.hunter@...el.com>, <mark.rutland@....com>,
        <robh+dt@...nel.org>, <ulf.hansson@...aro.org>, <faiz_abbas@...com>
Subject: [PATCH 3/7] dt-bindings: sdhci-omap: Add example for using external dma

From: Chunyan Zhang <zhang.chunyan@...aro.org>

sdhci-omap can support both external dma controller via dmaengine
framework as well as ADMA which standard SD host controller
provides.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
Signed-off-by: Faiz Abbas <faiz_abbas@...com>
---
 Documentation/devicetree/bindings/mmc/sdhci-omap.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-omap.txt b/Documentation/devicetree/bindings/mmc/sdhci-omap.txt
index 72c4dec7e1db..f8914a2a2aec 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-omap.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci-omap.txt
@@ -14,6 +14,11 @@ Required properties:
 		 "ddr_1_8v-rev11", "ddr_1_8v" or "ddr_3_3v", "hs200_1_8v-rev11",
 		 "hs200_1_8v",
 - pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
+- 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 "rx"
+		and "tx" for RX and TX DMA requests, respectively.
 
 Example:
 	mmc1: mmc@...9c000 {
@@ -22,4 +27,6 @@ Example:
 		ti,hwmods = "mmc1";
 		bus-width = <4>;
 		vmmc-supply = <&vmmc>; /* phandle to regulator node */
+		dmas = <&sdma 61 &sdma 62>;
+		dma-names = "tx", "rx";
 	};
-- 
2.19.2