From mboxrd@z Thu Jan 1 00:00:00 1970 From: padma.v@samsung.com (Padmavathi Venna) Date: Fri, 01 Feb 2013 18:21:55 +0530 Subject: [PATCH V2 3/4] ARM: dts: Add #dma-cells for generic dma binding support In-Reply-To: <1359723116-18173-1-git-send-email-padma.v@samsung.com> References: <1359723116-18173-1-git-send-email-padma.v@samsung.com> Message-ID: <1359723116-18173-4-git-send-email-padma.v@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch adds #dma-cells property to PL330 DMA controller nodes for supporting generic dma dt bindings on samsung exynos5250 platform. Signed-off-by: Padmavathi Venna --- .../devicetree/bindings/dma/arm-pl330.txt | 15 +++++++++++---- arch/arm/boot/dts/exynos5250.dtsi | 4 ++++ 2 files changed, 15 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/dma/arm-pl330.txt b/Documentation/devicetree/bindings/dma/arm-pl330.txt index 36e27d5..1fdbff6 100644 --- a/Documentation/devicetree/bindings/dma/arm-pl330.txt +++ b/Documentation/devicetree/bindings/dma/arm-pl330.txt @@ -8,6 +8,8 @@ Required properties: - reg: physical base address of the controller and length of memory mapped region. - interrupts: interrupt number to the cpu. + - #dma-cells: must be <1>. used to represent the number of integer + cells in the dmas property of client device. Optional properties: - dma-coherent : Present if dma operations are coherent @@ -18,16 +20,21 @@ Example: compatible = "arm,pl330", "arm,primecell"; reg = <0x12680000 0x1000>; interrupts = <99>; + #dma-cells = <1>; }; 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 -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"; diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi index f50b4e8..724f5bd 100644 --- a/arch/arm/boot/dts/exynos5250.dtsi +++ b/arch/arm/boot/dts/exynos5250.dtsi @@ -312,24 +312,28 @@ compatible = "arm,pl330", "arm,primecell"; reg = <0x121A0000 0x1000>; interrupts = <0 34 0>; + #dma-cells = <1>; }; pdma1: pdma at 121B0000 { compatible = "arm,pl330", "arm,primecell"; reg = <0x121B0000 0x1000>; interrupts = <0 35 0>; + #dma-cells = <1>; }; mdma0: mdma at 10800000 { compatible = "arm,pl330", "arm,primecell"; reg = <0x10800000 0x1000>; interrupts = <0 33 0>; + #dma-cells = <1>; }; mdma1: mdma at 11C10000 { compatible = "arm,pl330", "arm,primecell"; reg = <0x11C10000 0x1000>; interrupts = <0 124 0>; + #dma-cells = <1>; }; }; -- 1.7.4.4