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dma: Introduce dma_get_cfg() interface

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Sometimes, there would be a need to exchange data between DMA provider
and DMA client which are very specific to DMA driver of the SoC/platform
and are not generic enough to be put into struct dma. Therefore, introduce
dma_get_cfg() interface to get DMA provider specific data from client
device. Clients can use unique configuration ID flags to get different
configuration data from DMA driver.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
This commit is contained in:
Vignesh Raghavendra
2019-12-04 22:17:20 +05:30
committed by Joe Hershberger
parent 08b3e90a01
commit b8a4dd28f3
3 changed files with 35 additions and 0 deletions
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12
drivers/dma/dma-uclass.c
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@@ -187,6 +187,18 @@ int dma_send(struct dma *dma, void *src, size_t len, void *metadata)
return ops->send(dma, src, len, metadata);
}
int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data)
{
struct dma_ops *ops = dma_dev_ops(dma->dev);
debug("%s(dma=%p)\n", __func__, dma);
if (!ops->get_cfg)
return -ENOSYS;
return ops->get_cfg(dma, cfg_id, cfg_data);
}
#endif /* CONFIG_DMA_CHANNELS */
int dma_get_device(u32 transfer_type, struct udevice **devp)