Merge tag 'dmaengine-4.4-rc1' of git://git.infradead.org/users/vkoul/slave-dma

Pull dmaengine updates from Vinod Koul:
 "This time we have a very typical update which is mostly fixes and
  updates to drivers and no new drivers.

   - the biggest change is coming from Peter for edma cleanup which even
     caused some last minute regression, things seem settled now
   - idma64 and dw updates
   - iotdma updates
   - module autoload fixes for various drivers
   - scatter gather support for hdmac"

* tag 'dmaengine-4.4-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (77 commits)
  dmaengine: edma: Add dummy driver skeleton for edma3-tptc
  Revert "ARM: DTS: am33xx: Use the new DT bindings for the eDMA3"
  Revert "ARM: DTS: am437x: Use the new DT bindings for the eDMA3"
  dmaengine: dw: some Intel devices has no memcpy support
  dmaengine: dw: platform: provide platform data for Intel
  dmaengine: dw: don't override platform data with autocfg
  dmaengine: hdmac: Add scatter-gathered memset support
  dmaengine: hdmac: factorise memset descriptor allocation
  dmaengine: virt-dma: Fix kernel-doc annotations
  ARM: DTS: am437x: Use the new DT bindings for the eDMA3
  ARM: DTS: am33xx: Use the new DT bindings for the eDMA3
  dmaengine: edma: New device tree binding
  dmaengine: Kconfig: edma: Select TI_DMA_CROSSBAR in case of ARCH_OMAP
  dmaengine: ti-dma-crossbar: Add support for crossbar on AM33xx/AM43xx
  dmaengine: edma: Merge the of parsing functions
  dmaengine: edma: Do not allocate memory for edma_rsv_info in case of DT boot
  dmaengine: edma: Refactor the dma device and channel struct initialization
  dmaengine: edma: Get qDMA channel information from HW also
  dmaengine: edma: Merge map_dmach_to_queue into assign_channel_eventq
  dmaengine: edma: Correct PaRAM access function names (_parm_ to _param_)
  ...

1 files changed, 13 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt
index 63a48928f3a8..b152a75dceae 100644
--- a/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt
+++ b/Documentation/devicetree/bindings/dma/ti-dma-crossbar.txt
@@ -2,9 +2,10 @@ Texas Instruments DMA Crossbar (DMA request router)
 
 Required properties:
 - compatible:	"ti,dra7-dma-crossbar" for DRA7xx DMA crossbar
+		"ti,am335x-edma-crossbar" for AM335x and AM437x
 - reg:		Memory map for accessing module
-- #dma-cells:	Should be set to <1>.
-		Clients should use the crossbar request number (input)
+- #dma-cells:	Should be set to to match with the DMA controller's dma-cells
+		for ti,dra7-dma-crossbar and <3> for ti,am335x-edma-crossbar.
 - dma-requests:	Number of DMA requests the crossbar can receive
 - dma-masters:	phandle pointing to the DMA controller
 
@@ -14,6 +15,15 @@ The DMA controller node need to have the following poroperties:
 Optional properties:
 - ti,dma-safe-map: Safe routing value for unused request lines
 
+Notes:
+When requesting channel via ti,dra7-dma-crossbar, the DMA clinet must request
+the DMA event number as crossbar ID (input to the DMA crossbar).
+
+For ti,am335x-edma-crossbar: the meaning of parameters of dmas for clients:
+dmas = <&edma_xbar 12 0 1>; where <12> is the DMA request number, <0> is the TC
+the event should be assigned and <1> is the mux selection for in the crossbar.
+When mux 0 is used the DMA channel can be requested directly from edma node.
+
 Example:
 
 /* DMA controller */
@@ -47,6 +57,7 @@ uart1: serial@4806a000 {
 	ti,hwmods = "uart1";
 	clock-frequency = <48000000>;
 	status = "disabled";
+	/* Requesting crossbar input 49 and 50 */
 	dmas = <&sdma_xbar 49>, <&sdma_xbar 50>;
 	dma-names = "tx", "rx";
 };