dma: ipu: remove the use of ipu_platform_data

The struct ipu_platform_data is used by platform code to pass
MXC_IPU_IRQ_START to ipu-core driver.  We can save it by having
ipu-core driver call irq_alloc_descs to get the irq_base.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
diff --git a/arch/arm/plat-mxc/devices/platform-ipu-core.c b/arch/arm/plat-mxc/devices/platform-ipu-core.c
index 79d340a..d1e33cc 100644
--- a/arch/arm/plat-mxc/devices/platform-ipu-core.c
+++ b/arch/arm/plat-mxc/devices/platform-ipu-core.c
@@ -30,8 +30,7 @@
 static struct platform_device *imx_ipu_coredev __initdata;
 
 struct platform_device *__init imx_add_ipu_core(
-		const struct imx_ipu_core_data *data,
-		const struct ipu_platform_data *pdata)
+		const struct imx_ipu_core_data *data)
 {
 	/* The resource order is important! */
 	struct resource res[] = {
@@ -55,7 +54,7 @@
 	};
 
 	return imx_ipu_coredev = imx_add_platform_device("ipu-core", -1,
-			res, ARRAY_SIZE(res), pdata, sizeof(*pdata));
+			res, ARRAY_SIZE(res), NULL, 0);
 }
 
 struct platform_device *__init imx_alloc_mx3_camera(