tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1QCOM BAM DMA controller
2
3Required properties:
4- compatible: must be one of the following:
5 * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084
6 * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960
7 * "qcom,bam-v1.7.0" for MSM8916
8- reg: Address range for DMA registers
9- interrupts: Should contain the one interrupt shared by all channels
10- #dma-cells: must be <1>, the cell in the dmas property of the client device
11 represents the channel number
12- clocks: required clock
13- clock-names: must contain "bam_clk" entry
14- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
15 the secure world.
16- qcom,controlled-remotely : optional, indicates that the bam is controlled by
17 remote proccessor i.e. execution environment.
18- num-channels : optional, indicates supported number of DMA channels in a
19 remotely controlled bam.
20- qcom,num-ees : optional, indicates supported number of Execution Environments
21 in a remotely controlled bam.
22
23Example:
24
25 uart-bam: dma@f9984000 = {
26 compatible = "qcom,bam-v1.4.0";
27 reg = <0xf9984000 0x15000>;
28 interrupts = <0 94 0>;
29 clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
30 clock-names = "bam_clk";
31 #dma-cells = <1>;
32 qcom,ee = <0>;
33 };
34
35DMA clients must use the format described in the dma.txt file, using a two cell
36specifier for each channel.
37
38Example:
39 serial@f991e000 {
40 compatible = "qcom,msm-uart";
41 reg = <0xf991e000 0x1000>
42 <0xf9944000 0x19000>;
43 interrupts = <0 108 0>;
44 clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
45 <&gcc GCC_BLSP1_AHB_CLK>;
46 clock-names = "core", "iface";
47
48 dmas = <&uart-bam 0>, <&uart-bam 1>;
49 dma-names = "rx", "tx";
50 };