Re: [PATCH 1/1] iio: use dmaengine_get_dma_device() instead of chan->device->dev

[Jonathan Cameron]

On Fri, 18 Sep 2026 09:47:24 +0300
Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> wrote:

> On Thu, Sep 17, 2026 at 04:36:26PM -0400, Frank.Li@xxxxxxxxxxx wrote:
> 
> > Replace direct dma_chan::device::dev access with the proper
> > dmaengine_get_dma_device() accessor in IIO DMA consumers.
> > 
> > chan->device->dev is not always the device used for DMA mapping.
> > Some DMA engines support per-channel IOMMU mappings, so different
> > channels may use different DMA devices.  dmaengine_get_dma_device()
> > returns the correct device for each channel.
> > 
> > This also prepares for making the DMA engine provider data structures
> > private. DMA consumers should not access DMA engine internals directly.  
> 
> ...
> 
> >  drivers/iio/adc/at91-sama5d2_adc.c                 |  9 ++++++---
> >  drivers/iio/adc/nxp-sar-adc.c                      |  2 +-
> >  drivers/iio/adc/stm32-adc.c                        | 10 ++++++----
> >  drivers/iio/adc/stm32-dfsdm-adc.c                  |  4 ++--
> >  drivers/iio/adc/ti_am335x_adc.c                    |  4 ++--
> >  drivers/iio/buffer/industrialio-buffer-dmaengine.c |  5 +++--  
> 
> Strictly speaking this is two patches, one per ADC folder and the other against
> IIO core. But this one is not a big one, so up to Jonathan.
Agreed that would be ideal but I don't care enough for a v2!
> 
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>

Applied to the testing branch of iio.git (material for next merge window)
That will turn up in linux-next once tests are done and I remember to push.

Thanks,

Jonathan

>