[Patch v2][ 02/37] dma: ipu: Add devicetree support.

[Denis Carikli <denis-fO0SIAKYzcbQT0dZR+AlfA@public.gmane.org>]

Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Cc: Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
Cc: Ian Campbell <ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: Eric Bénard <eric-fO0SIAKYzcbQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Denis Carikli <denis-fO0SIAKYzcbQT0dZR+AlfA@public.gmane.org>
---
 .../devicetree/bindings/dma/fsl-imx-ipu.txt        |   53 ++++++++++++++++++++
 drivers/dma/ipu/ipu_idmac.c                        |    8 +++
 2 files changed, 61 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/fsl-imx-ipu.txt

diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-ipu.txt b/Documentation/devicetree/bindings/dma/fsl-imx-ipu.txt
new file mode 100644
index 0000000..a901c33
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-ipu.txt
@@ -0,0 +1,53 @@
+* Freescale Image Processing Unit DMA support for i.MX3x.
+
+This document will only describe differences to the generic DMA Controller and
+DMA request bindings as described in dma/dma.txt .
+
+This dma driver supports the imx31 and imx35 devices.
+
+* DMA controller
+
+Required properties:
+- compatible : Should be "fsl,imx31-ipu".
+- reg : Should contain DMA registers location and length
+- interrupts : First item should be DMA interrupt, second one is optional and
+    should contain DMA Error interrupt.
+- #dma-cells : Has to be 1. The ipu driver does not support anything else.
+
+Optional properties:
+- dma-channels : Number of DMA channels supported. Should be 32.
+- #dma-requests : Number of DMA requests supported.
+
+Example:
+
+	ipu: ipu@53fc0000 {
+		compatible = "fsl,imx31-ipu";
+		reg = <	0x53fc0000 0x5f
+			0x53fc0088 0x2b >;
+		interrupts = <42 41>;
+		dma-channels = <32>;
+		#dma-cells = <1>;
+		clocks = <&clks 55>;
+		clock-names = "";
+		status = "disabled";
+	};
+
+* DMA client
+
+Clients have to specify the DMA requests with phandles in a list.
+
+Required properties:
+- dmas: List of one or more DMA request specifiers. One DMA request specifier
+    consists of a phandle to the DMA controller followed by the integer
+    specifying the request line.
+- dma-names: List of string identifiers for the DMA requests. For the correct
+    names, have a look at the specific client driver.
+
+Example:
+
+	lcdc: mx3fb@53fc00b4 {
+		...
+		dmas = <&ipu 14>;
+		dma-names = "tx";
+		...
+	};
diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c
index cb9c0bc..d853ee1 100644
--- a/drivers/dma/ipu/ipu_idmac.c
+++ b/drivers/dma/ipu/ipu_idmac.c
@@ -22,6 +22,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/dma/ipu-dma.h>
 
 #include "../dmaengine.h"
@@ -1768,6 +1769,12 @@ static int ipu_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id ipu_dma_of_dev_id[] = {
+	{ .compatible = "fsl,imx31-ipu", },
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ipu_dma_of_dev_id);
+
 /*
  * We need two MEM resources - with IPU-common and Image Converter registers,
  * including PF_CONF and IDMAC_* registers, and two IRQs - function and error
@@ -1775,6 +1782,7 @@ static int ipu_remove(struct platform_device *pdev)
 static struct platform_driver ipu_platform_driver = {
 	.driver = {
 		.name	= "ipu-core",
+		.of_match_table = of_match_ptr(ipu_dma_of_dev_id),
 		.owner	= THIS_MODULE,
 	},
 	.remove		= ipu_remove,
-- 
1.7.9.5

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