linux-kernel - [PATCH v4 06/21] ARM: dts: provide DMA config to pxamci on PXA27x

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Date:	Wed, 16 Apr 2014 21:13:16 +0400
From:	Sergei Ianovich <ynvich@...il.com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Sergei Ianovich <ynvich@...il.com>, Daniel Mack <zonque@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Russell King <linux@....linux.org.uk>,
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND...),
	linux-doc@...r.kernel.org (open list:DOCUMENTATION)
Subject: [PATCH v4 06/21] ARM: dts: provide DMA config to pxamci on PXA27x

Non-dts implementation supply required DMA channel numbers as
IORESOURCE_DMA. We can also get them from the device tree, if it
is present.

This patch updates device tree with the proper dmaengine-based
"marvell,pdma-1.0" DMA.

There is no actual data handling in this patch, because the existing
driver cannot get DMA channel number from dmaengine API. The patch
in the series will provide temporary workaround by manually parsing
node attributes, until Daniel's series is ready to be merged.

Signed-off-by: Sergei Ianovich <ynvich@...il.com>
CC: Daniel Mack <zonque@...il.com>
CC: Haojian Zhuang <haojian.zhuang@...il.com>
CC: Arnd Bergmann <arnd@...db.de>
---
   v3..v4
   * no changes

   v2..v3
   * split into good (this one) and temporary (PATCH 07/21) parts

   v1..v2
   * add binding for next-gen dma controller
   * use correct dma declararion
   * number changed from 5 to 3

 Documentation/devicetree/bindings/mmc/pxa-mmc.txt |  5 +++++
 arch/arm/boot/dts/pxa27x.dtsi                     | 14 ++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/pxa-mmc.txt b/Documentation/devicetree/bindings/mmc/pxa-mmc.txt
index b7025de..9f54c69 100644
--- a/Documentation/devicetree/bindings/mmc/pxa-mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/pxa-mmc.txt
@@ -5,6 +5,8 @@ Driver bindings for the PXA MCI (MMC/SDIO) interfaces
 Required properties:
 - compatible: Should be "marvell,pxa-mmc".
 - vmmc-supply: A regulator for VMMC
+- dmas: Should be DMA specifiers for RX and TX
+- dma-names: Should be "rx" and "tx"
 
 Optional properties:
 - marvell,detect-delay-ms: sets the detection delay timeout in ms.
@@ -21,5 +23,8 @@ mmc0: mmc@...00000 {
 	interrupts = <23>;
 	cd-gpios = <&gpio 23 0>;
 	wp-gpios = <&gpio 24 0>;
+	dmas = <&dma 21
+		&dma 22>;
+	dma-names = "rx", "tx";
 };
 
diff --git a/arch/arm/boot/dts/pxa27x.dtsi b/arch/arm/boot/dts/pxa27x.dtsi
index 39bed5e..0150531 100644
--- a/arch/arm/boot/dts/pxa27x.dtsi
+++ b/arch/arm/boot/dts/pxa27x.dtsi
@@ -35,10 +35,24 @@
 			#pwm-cells = <1>;
 		};
 
+		dma: dma-controller@...00000 {
+			compatible = "marvell,pdma-1.0";
+			reg = <0x40000000 0x10000>;
+			interrupts = <25>;
+			#dma-cells = <1>;
+			dma-channels = <32>;
+		};
+
 		gpio: gpio@...00000 {
 			compatible = "intel,pxa27x-gpio";
 			interrupts = <8>, <9>, <10>;
 			interrupt-names = "gpio0", "gpio1", "gpio_mux";
 		};
+
+		mmc@...00000 {
+			dmas = <&dma 21
+				&dma 22>;
+			dma-names = "rx", "tx";
+		};
 	};
 };
-- 
1.8.4.2

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