Add support for DMA initialization using devicetree node. This patch adds two fields to imx_pcm_dma_params to pass device node information from other imx drivers to this one. If the dma_node is set, this driver tries to initialize a PCM DMA substream based on the dma_node and name.
Signed-off-by: Markus Pargmann <[email protected]> --- Notes: Changes in v2: - Use snd_dmaengine_generic_pcm_open instead of of_snd_dmaengine_pcm_open. - Pass the device in imx_pcm_dma_params. sound/soc/fsl/imx-pcm-dma.c | 31 ++++++++++++++++++++----------- sound/soc/fsl/imx-pcm.h | 6 ++++++ 2 files changed, 26 insertions(+), 11 deletions(-) diff --git a/sound/soc/fsl/imx-pcm-dma.c b/sound/soc/fsl/imx-pcm-dma.c index 500f8ce..2d15ca5 100644 --- a/sound/soc/fsl/imx-pcm-dma.c +++ b/sound/soc/fsl/imx-pcm-dma.c @@ -101,26 +101,35 @@ static int snd_imx_open(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct imx_pcm_dma_params *dma_params; - struct imx_dma_data *dma_data; + struct imx_dma_data *dma_data = NULL; int ret; snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); - dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL); - if (!dma_data) - return -ENOMEM; + if (dma_params->dma_client_dev) { + ret = snd_dmaengine_generic_pcm_open(substream, + dma_params->dma_client_dev, + dma_params->dma_req_name); + if (ret) + return ret; + } else { + dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL); + if (!dma_data) + return -ENOMEM; - dma_data->peripheral_type = dma_params->shared_peripheral ? + dma_data->peripheral_type = dma_params->shared_peripheral ? IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI; - dma_data->priority = DMA_PRIO_HIGH; - dma_data->dma_request = dma_params->dma; + dma_data->priority = DMA_PRIO_HIGH; + dma_data->dma_request = dma_params->dma; - ret = snd_dmaengine_pcm_open(substream, filter, dma_data); - if (ret) { - kfree(dma_data); - return ret; + ret = snd_dmaengine_pcm_open(substream, filter, dma_data); + + if (ret) { + kfree(dma_data); + return ret; + } } snd_dmaengine_pcm_set_data(substream, dma_data); diff --git a/sound/soc/fsl/imx-pcm.h b/sound/soc/fsl/imx-pcm.h index 5ae13a1..ff0cfdf 100644 --- a/sound/soc/fsl/imx-pcm.h +++ b/sound/soc/fsl/imx-pcm.h @@ -23,6 +23,12 @@ struct imx_pcm_dma_params { unsigned long dma_addr; int burstsize; bool shared_peripheral; /* The peripheral is on SPBA bus */ + + /* If set, the DMA channel is requested using the generic handler while + * ignoring fields 'dma' and 'shared_peripheral'. They have to be set + * in devicetree according to the DMA Controller devicetree bindings. */ + struct device *dma_client_dev; + const char *dma_req_name; /* DMA Request name from devicetree */ }; int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, -- 1.8.1.5 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
