dt-bindings: dmaengine: dw-dmac: add protection control property

This patch for the DesignWare AHB Central
Direct Memory Access Controller adds the dma
protection control property:
"snps,dma-protection-control"

as well as the properties specific values defines into a new include file: include/dt-bindings/dma/dw-dmac.h

Note: The protection control signals are one-to-one mapped to the AHB HPROT[1:3] signals for this controller. The HPROT0 (Data Access) is always hardwired to 1.

Reviewed-by Andy Shevchenko <[email protected]>

Signed-off-by Christian Lamparter <[email protected]>

---
I've included the "Reviewed-by" from the v1 in this patch for now. But if a new issue comes up regarding the updates, please let me know.

---
 Documentation/devicetree/bindings/dma/snps-dma.txt |  4 ++++
 MAINTAINERS                                        |  4 +++-
 include/dt-bindings/dma/dw-dmac.h                  | 14 ++++++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 include/dt-bindings/dma/dw-dmac.h