diff options
| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2011-10-17 14:56:41 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@linux.intel.com> | 2011-11-10 09:43:33 +0100 |
| commit | c511595390a373e19a774246c659b4f563a4c3f3 (patch) | |
| tree | 79df5e99ecbff0c8d309e603266698448f998d28 /drivers | |
| parent | dmaengine: at_hdmac: platform data move to use .id_table (diff) | |
| download | linux-c511595390a373e19a774246c659b4f563a4c3f3.tar.xz linux-c511595390a373e19a774246c659b4f563a4c3f3.zip | |
dmaengine: at_hdmac: add device tree support
Add device tree probe support for atmel at_hdmac DMA driver.
Bindings are added to specify DMA controller configuration.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/dma/at_hdmac.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index d1869c597e42..f3cb4a009e7d 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -23,6 +23,8 @@ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> #include "at_hdmac_regs.h" @@ -1175,6 +1177,20 @@ static void atc_free_chan_resources(struct dma_chan *chan) /*-- Module Management -----------------------------------------------*/ +#if defined(CONFIG_OF) +static const struct of_device_id atmel_dma_dt_ids[] = { + { + .compatible = "atmel,at91sam9rl-dma", + .data = (void *)ATDMA_DEVTYPE_SAM9RL + }, { + .compatible = "atmel,at91sam9g45-dma", + .data = (void *)ATDMA_DEVTYPE_SAM9G45 + }, { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids); +#endif + static struct platform_device_id atdma_devtypes[] = { { .name = "at91sam9rl_dma", @@ -1187,6 +1203,19 @@ static struct platform_device_id atdma_devtypes[] = { } }; +static inline enum atdma_devtype __init at_dma_get_driver_data( + struct platform_device *pdev) +{ + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node); + if (match == NULL) + return ATDMA_DEVTYPE_UNDEFINED; + return (enum atdma_devtype)match->data; + } + return platform_get_device_id(pdev)->driver_data; +} + /** * at_dma_off - disable DMA controller * @atdma: the Atmel HDAMC device @@ -1218,7 +1247,7 @@ static int __init at_dma_probe(struct platform_device *pdev) dma_cap_set(DMA_MEMCPY, cap_mask); /* get DMA parameters from controller type */ - atdmatype = platform_get_device_id(pdev)->driver_data; + atdmatype = at_dma_get_driver_data(pdev); switch (atdmatype) { case ATDMA_DEVTYPE_SAM9RL: @@ -1526,6 +1555,7 @@ static struct platform_driver at_dma_driver = { .driver = { .name = "at_hdmac", .pm = &at_dma_dev_pm_ops, + .of_match_table = of_match_ptr(atmel_dma_dt_ids), }, }; |