Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 42cf2098 authored by Padmavathi Venna's avatar Padmavathi Venna Committed by Vinod Koul
Browse files

ARM: dts: pl330: Add #dma-cells for generic dma binding support 



This patch adds #dma-cells property to PL330 DMA controller
nodes for supporting generic dma dt bindings on samsung
exynos5250 platform.

Signed-off-by: default avatarPadmavathi Venna <padma.v@samsung.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 421da89a

Documentation/devicetree/bindings/dma/arm-pl330.txt

+16 −5
Original line number Diff line number Diff line
@@ -11,6 +11,10 @@ Required properties: 


Optional properties:

  - dma-coherent      : Present if dma operations are coherent

  - #dma-cells: must be <1>. used to represent the number of integer

    cells in the dmas property of client device.

  - dma-channels: contains the total number of DMA channels supported by the DMAC

  - dma-requests: contains the total number of DMA requests supported by the DMAC



Example:
@@ -18,16 +22,23 @@ Example: 
		compatible = "arm,pl330", "arm,primecell";

		reg = <0x12680000 0x1000>;

		interrupts = <99>;

		#dma-cells = <1>;

		#dma-channels = <8>;

		#dma-requests = <32>;

	};



Client drivers (device nodes requiring dma transfers from dev-to-mem or

mem-to-dev) should specify the DMA channel numbers using a two-value pair

mem-to-dev) should specify the DMA channel numbers and dma channel names

as shown below.



  [property name]  = <[phandle of the dma controller] [dma request id]>;

  [property name]  = <[dma channel name]>



      where 'dma request id' is the dma request number which is connected

      to the client controller. The 'property name' is recommended to be

      of the form <name>-dma-channel.

      to the client controller. The 'property name' 'dmas' and 'dma-names'

      as required by the generic dma device tree binding helpers. The dma

      names correspond 1:1 with the dma request ids in the dmas property.



  Example:  tx-dma-channel = <&pdma0 12>;
 
  Example:  dmas = <&pdma0 12

		    &pdma1 11>;

	    dma-names = "tx", "rx";

arch/arm/boot/dts/exynos5250.dtsi

+12 −0
Original line number Diff line number Diff line
@@ -280,24 +280,36 @@ 
			compatible = "arm,pl330", "arm,primecell";

			reg = <0x121A0000 0x1000>;

			interrupts = <0 34 0>;

			#dma-cells = <1>;

			#dma-channels = <8>;

			#dma-requests = <32>;

		};



		pdma1: pdma@121B0000 {

			compatible = "arm,pl330", "arm,primecell";

			reg = <0x121B0000 0x1000>;

			interrupts = <0 35 0>;

			#dma-cells = <1>;

			#dma-channels = <8>;

			#dma-requests = <32>;

		};



		mdma0: mdma@10800000 {

			compatible = "arm,pl330", "arm,primecell";

			reg = <0x10800000 0x1000>;

			interrupts = <0 33 0>;

			#dma-cells = <1>;

			#dma-channels = <8>;

			#dma-requests = <1>;

		};



		mdma1: mdma@11C10000 {

			compatible = "arm,pl330", "arm,primecell";

			reg = <0x11C10000 0x1000>;

			interrupts = <0 124 0>;

			#dma-cells = <1>;

			#dma-channels = <8>;

			#dma-requests = <1>;

		};

	};