From: Gerhard Sittig <gsi@xxxxxxx> 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: Gerhard Sittig <gsi@xxxxxxx> [ a13xp0p0v88@xxxxxxxxx: resolve little patch conflict and put MPC512x DMA controller bindings document to a separate patch ] --- arch/powerpc/boot/dts/mpc5121.dtsi | 1 + drivers/dma/mpc512x_dma.c | 21 ++++++++++++++++++--- 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/boot/dts/mpc5121.dtsi b/arch/powerpc/boot/dts/mpc5121.dtsi index 2c0e155..7f9d14f 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 8f504cb..d9f8740 100644 --- a/drivers/dma/mpc512x_dma.c +++ b/drivers/dma/mpc512x_dma.c @@ -52,6 +52,7 @@ #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> @@ -1018,11 +1019,23 @@ static int mpc_dma_probe(struct platform_device *op) /* Register DMA engine */ dev_set_drvdata(dev, mdma); retval = dma_async_device_register(dma); - if (retval) { - devm_free_irq(dev, mdma->irq, mdma); - irq_dispose_mapping(mdma->irq); + if (retval) + goto out_irq; + + /* 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; + +out_irq: + devm_free_irq(dev, mdma->irq, mdma); + irq_dispose_mapping(mdma->irq); return retval; } @@ -1031,6 +1044,8 @@ 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); devm_free_irq(dev, mdma->irq, mdma); irq_dispose_mapping(mdma->irq); -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html