[0/2] STM32 DMA Direct mode

Message

Amelie Delaunay April 22, 2020, 10:29 a.m. UTC

By default, the driver compute if the FIFO must operate in direct mode or with
FIFO threshold. Direct mode is allowed only if computed source burst and
destination burst are disabled. But with memory source or destination, burst
is always > 0.
Direct mode is useful when the peripheral requires an immediate and single
transfer to or from the memory after each DMA request.
This patchset adds a way to force Direct mode through device tree.

Amelie Delaunay (2):
  dt-bindings: dma: add direct mode support through device tree in
    stm32-dma
  dmaengine: stm32-dma: direct mode support through device tree

 .../devicetree/bindings/dma/st,stm32-dma.yaml |  5 +++
 drivers/dma/stm32-dma.c                       | 41 ++++++++++++++-----
 2 files changed, 36 insertions(+), 10 deletions(-)

Comments

Vinod Koul April 27, 2020, 4:10 p.m. UTC | #1

On 22-04-20, 12:29, Amelie Delaunay wrote:
> By default, the driver compute if the FIFO must operate in direct mode or with
> FIFO threshold. Direct mode is allowed only if computed source burst and
> destination burst are disabled. But with memory source or destination, burst
> is always > 0.
> Direct mode is useful when the peripheral requires an immediate and single
> transfer to or from the memory after each DMA request.
> This patchset adds a way to force Direct mode through device tree.

Applied, thanks