[PATCH] dma: imx-dma: Add oftree support
From: Markus Pargmann <hidden>
Date: 2013-02-22 14:37:18
Also in:
linux-devicetree
Subsystem:
dma generic offload engine subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Vinod Koul, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Adding devicetree support for imx-dma driver. Use driver name for function 'imx_dma_is_general_purpose' because the devicename for devicetree initialized devices is different. Signed-off-by: Markus Pargmann <redacted> --- .../devicetree/bindings/dma/fsl-imx-dma.txt | 13 ++++++++++++ drivers/dma/imx-dma.c | 23 ++++++++++++++++++++++ include/linux/platform_data/dma-imx.h | 3 ++- 3 files changed, 38 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
new file mode 100644
index 0000000..9a1df37
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt@@ -0,0 +1,13 @@ +* Freescale Direct Memory Access (DMA) Controller for i.MX + +Required properties: +- compatible : Should be "fsl,<chip>-dma". chip can be imx1, imx21 or imx27 +- 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: dma at 10001000 { + compatible = "fsl,imx27-dma"; + reg = <0x10001000 0x1000>; + interrupts = <32 33>; +};
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index a7dcf78..73eb59c 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c@@ -26,6 +26,7 @@ #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/module.h> +#include <linux/of_device.h> #include <asm/irq.h> #include <linux/platform_data/dma-imx.h>
@@ -201,6 +202,22 @@ static struct platform_device_id imx_dma_devtype[] = { }; MODULE_DEVICE_TABLE(platform, imx_dma_devtype); +static const struct of_device_id imx_dma_of_dev_id[] = { + { + .compatible = "fsl,imx1-dma", + .data = &imx_dma_devtype[IMX1_DMA], + }, { + .compatible = "fsl,imx21-dma", + .data = &imx_dma_devtype[IMX21_DMA], + }, { + .compatible = "fsl,imx27-dma", + .data = &imx_dma_devtype[IMX27_DMA], + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id); + static inline int is_imx1_dma(struct imxdma_engine *imxdma) { return imxdma->devtype == IMX1_DMA;
@@ -1000,9 +1017,14 @@ static int __init imxdma_probe(struct platform_device *pdev) { struct imxdma_engine *imxdma; struct resource *res; + const struct of_device_id *of_id; int ret, i; int irq, irq_err; + of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev); + if (of_id) + pdev->id_entry = of_id->data; + imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL); if (!imxdma) return -ENOMEM;
@@ -1159,6 +1181,7 @@ static int __exit imxdma_remove(struct platform_device *pdev) static struct platform_driver imxdma_driver = { .driver = { .name = "imx-dma", + .of_match_table = imx_dma_of_dev_id, }, .id_table = imx_dma_devtype, .remove = __exit_p(imxdma_remove),
diff --git a/include/linux/platform_data/dma-imx.h b/include/linux/platform_data/dma-imx.h
index f6d30cc..2ce4aba 100644
--- a/include/linux/platform_data/dma-imx.h
+++ b/include/linux/platform_data/dma-imx.h@@ -63,7 +63,8 @@ static inline int imx_dma_is_general_purpose(struct dma_chan *chan) return strstr(dev_name(chan->device->dev), "sdma") || !strcmp(dev_name(chan->device->dev), "imx1-dma") || !strcmp(dev_name(chan->device->dev), "imx21-dma") || - !strcmp(dev_name(chan->device->dev), "imx27-dma"); + !strcmp(dev_name(chan->device->dev), "imx27-dma") || + !strcmp(chan->device->dev->driver->name, "imx-dma"); } #endif
--
1.8.1.2