Add device tree binding support for the QCOM BAM DMA driver. Signed-off-by: Andy Gross <agross@xxxxxxxxxxxxxx> --- .../devicetree/bindings/dma/qcom_bam_dma.txt | 52 ++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt new file mode 100644 index 0000000..6a48188 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt @@ -0,0 +1,52 @@ +QCOM BAM DMA controller + +Required properties: +- compatible: Must be "qcom,bam-v1.4.0" for MSM8974 V1 + Must be "qcom,bam-v1.4.1" for MSM8974 V2 +- reg: Address range for DMA registers +- interrupts: single interrupt for this controller +- #dma-cells: must be <3> +- clocks: required clock +- clock-names: name of clock + +Example: + + uart-bam: dma@f9984000 = { + compatible = "qcom,bam-v1.4.1"; + reg = <0xf9984000 0x15000>; + interrupts = <0 94 0>; + clocks = <&gcc GCC_BAM_DMA_AHB_CLK>; + clock-names = "bam_clk"; + #dma-cells = <3>; + }; + +Client: +Required properties: +- dmas: List of dma channel requests +- dma-names: Names of aforementioned requested channels + +Clients must use the format described in the dma.txt file, using a four cell +specifier for each channel. + +The four cells in order are: + 1. A phandle pointing to the DMA controller + 2. The channel number + 3. The execution environment value for this channel. This is used to indicate + the trustzone index used during register access. + 4. Direction of the fixed unidirectional channel + 0 - Memory to Device + 1 - Device to Memory + 2 - Device to Device + +Example: + serial@f991e000 { + compatible = "qcom,msm-uart"; + reg = <0xf991e000 0x1000> + <0xf9944000 0x19000>; + interrupts = <0 108 0>; + clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>; + clock-names = "core", "iface"; + + dmas = <&uart-bam 0 0 1>, <&uart-bam 1 0 0>; + dma-names = "rx", "tx"; + }; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html