dma: mxs-dma: add device tree probe support

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Huang Shijie <b32955@freescale.com>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Vinod Koul <vinod.koul@intel.com>

2 files changed, 43 insertions, 5 deletions

diff --git a/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt b/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt
new file mode 100644
index 000000000000..ded0398d3bdc
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl-mxs-dma.txt
@@ -0,0 +1,19 @@
+* Freescale MXS DMA
+
+Required properties:
+- compatible : Should be "fsl,<chip>-dma-apbh" or "fsl,<chip>-dma-apbx"
+- reg : Should contain registers location and length
+
+Supported chips:
+imx23, imx28.
+
+Examples:
+dma-apbh@80004000 {
+        compatible = "fsl,imx28-dma-apbh";
+        reg = <0x80004000 2000>;
+};
+
+dma-apbx@80024000 {
+        compatible = "fsl,imx28-dma-apbx";
+        reg = <0x80024000 2000>;
+};
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index b1cab087cd04..1cb9b974493f 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -22,8 +22,11 @@
 #include <linux/platform_device.h>
 #include <linux/dmaengine.h>
 #include <linux/delay.h>
+#include <linux/module.h>
 #include <linux/fsl/mxs-dma.h>
 #include <linux/stmp_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <asm/irq.h>
 #include <mach/mxs.h>
@@ -177,6 +180,15 @@ static struct platform_device_id mxs_dma_ids[] = {
         }
 };
 
+static const struct of_device_id mxs_dma_dt_ids[] = {
+        { .compatible = "fsl,imx23-dma-apbh", .data = &mxs_dma_ids[0], },
+        { .compatible = "fsl,imx23-dma-apbx", .data = &mxs_dma_ids[1], },
+        { .compatible = "fsl,imx28-dma-apbh", .data = &mxs_dma_ids[2], },
+        { .compatible = "fsl,imx28-dma-apbx", .data = &mxs_dma_ids[3], },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_dma_dt_ids);
+
 static struct mxs_dma_chan *to_mxs_dma_chan(struct dma_chan *chan)
 {
         return container_of(chan, struct mxs_dma_chan, chan);
@@ -652,10 +664,9 @@ err_out:
 
 static int __init mxs_dma_probe(struct platform_device *pdev)
 {
-        const struct platform_device_id *id_entry =
-                                platform_get_device_id(pdev);
-        const struct mxs_dma_type *dma_type =
-                        (struct mxs_dma_type *)id_entry->driver_data;
+        const struct platform_device_id *id_entry;
+        const struct of_device_id *of_id;
+        const struct mxs_dma_type *dma_type;
         struct mxs_dma_engine *mxs_dma;
         struct resource *iores;
         int ret, i;
@@ -664,8 +675,15 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
         if (!mxs_dma)
                 return -ENOMEM;
 
-        mxs_dma->dev_id = dma_type->id;
+        of_id = of_match_device(mxs_dma_dt_ids, &pdev->dev);
+        if (of_id)
+                id_entry = of_id->data;
+        else
+                id_entry = platform_get_device_id(pdev);
+
+        dma_type = (struct mxs_dma_type *)id_entry->driver_data;
         mxs_dma->type = dma_type->type;
+        mxs_dma->dev_id = dma_type->id;
 
         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
@@ -751,6 +769,7 @@ err_request_region:
 static struct platform_driver mxs_dma_driver = {
         .driver         = {
                 .name   = "mxs-dma",
+                .of_match_table = mxs_dma_dt_ids,
         },
         .id_table       = mxs_dma_ids,
 };