dmaengine: sun6i-dma: Add num_channels_per_reg for flexible interrupt mapping

The `sun6i-dma` driver previously assumed a fixed number of channels
per interrupt register. For example, `sun6i_kill_tasklet` was hardcoded
to disable interrupts only for registers 0 and 1. `DMA_MAX_CHANNELS` was
also not in used previously, and the old SoCs never has more than 16
channels.

The A733 has a different interrupt structure where the number of
channels per register may differ. Add `num_channels_per_reg` to `struct
sun6i_dma_config` to make the interrupt handling logic handware-agnostic
Update `sun6i_dma_interrupt`, `sun6i_dma_start_desc`, and
`sun6i_kill_tasklet` to use this value.

Additionally, set `DMA_MAX_CHANNELS` to 16 to ensure loops over
interrupts are correctly bounded, aligning with the hardware
specifications.

Signed-off-by: Yuanshen Cao <alex.caoys@gmail.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260826-sun60i-a733-dma-v5-3-abc5229b441e@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

0 files changed, 0 insertions, 0 deletions