dmaengine: mpc512x: register for device tree channel lookup

Register the controller for device tree based lookup of DMA channels
(non-fatal for backwards compatibility with older device trees) and
provide the '#dma-cells' property in the shared mpc5121.dtsi file

Signed-off-by: Alexander Popov <a13xp0p0v88@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2 files changed, 13 insertions, 1 deletions

diff --git a/arch/powerpc/boot/dts/mpc5121.dtsi b/arch/powerpc/boot/dts/mpc5121.dtsi
index 2c0e1552d20b..7f9d14f5c4da 100644
--- a/arch/powerpc/boot/dts/mpc5121.dtsi
+++ b/arch/powerpc/boot/dts/mpc5121.dtsi
@@ -498,6 +498,7 @@
                         compatible = "fsl,mpc5121-dma";
                         reg = <0x14000 0x1800>;
                         interrupts = <65 0x8>;
+                        #dma-cells = <1>;
                 };
         };
 
diff --git a/drivers/dma/mpc512x_dma.c b/drivers/dma/mpc512x_dma.c
index 2ad43738ac8b..881db2bcb48b 100644
--- a/drivers/dma/mpc512x_dma.c
+++ b/drivers/dma/mpc512x_dma.c
@@ -53,6 +53,7 @@
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
+#include <linux/of_dma.h>
 #include <linux/of_platform.h>
 
 #include <linux/random.h>
@@ -1036,7 +1037,15 @@ static int mpc_dma_probe(struct platform_device *op)
         if (retval)
                 goto err_free2;
 
-        return retval;
+        /* Register with OF helpers for DMA lookups (nonfatal) */
+        if (dev->of_node) {
+                retval = of_dma_controller_register(dev->of_node,
+                                                of_dma_xlate_by_chan_id, mdma);
+                if (retval)
+                        dev_warn(dev, "Could not register for OF lookup\n");
+        }
+
+        return 0;
 
 err_free2:
         if (mdma->is_mpc8308)
@@ -1057,6 +1066,8 @@ static int mpc_dma_remove(struct platform_device *op)
         struct device *dev = &op->dev;
         struct mpc_dma *mdma = dev_get_drvdata(dev);
 
+        if (dev->of_node)
+                of_dma_controller_free(dev->of_node);
         dma_async_device_unregister(&mdma->dma);
         if (mdma->is_mpc8308) {
                 free_irq(mdma->irq2, mdma);