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kernel_samsung_sm7125/Documentation/devicetree/bindings/dma/sps/sps.txt

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SPS (Smart Peripheral Switch) may be used as a DMA engine to move data
in either the Peripheral-to-Peripheral (a.k.a. BAM-to-BAM) mode or the
Peripheral-to-Memory (a.k.a. BAM-System) mode. SPS includes BAM (Bus
Access Module) hardware block, BAM DMA peripheral, and pipe memory.
Required property:
- compatible: should be "qcom,msm-sps" or "qcom,msm-sps-4k"
Optional properties:
- reg: offset and size for the memory mapping, including maps for
BAM DMA BAM, BAM DMA peripheral, pipe memory and reserved memory.
- reg-names: indicates various resources passed to driver (via reg
property) by name. "reg-names" examples are "bam_mem", "core_mem"
, "pipe_mem" and "res_mem".
- interrupts: IRQ line
- qcom,device-type: specify the device configuration of BAM DMA and
pipe memory. Can be one of
1 - With BAM DMA and without pipe memory
2 - With BAM DMA and with pipe memory
3 - Without BAM DMA and without pipe memory
- qcom,pipe-attr-ee: BAM pipes are attributed to a specific EE, with
which we can know the pipes belong to apps side and can have the
error interrupts at the pipe level.
- clocks: This property shall provide a list of entries each of which
contains a phandle to clock controller device and a macro that is
the clock's name in hardware.These should be "clock_rpm" as clock
controller phandle and "clk_pnoc_sps_clk" as macro for "dfab_clk"
and "clock_gcc" as clock controller phandle and "clk_gcc_bam_dma_ahb_clk"
as macro for "dma_bam_pclk".
- clock-names: This property shall contain the clock input names used
by driver in same order as the clocks property.These should be "dfab_clk"
and "dma_bam_pclk".
Example:
qcom,sps@f9980000 {
compatible = "qcom,msm-sps";
reg = <0xf9984000 0x15000>,
<0xf9999000 0xb000>,
<0xfe803000 0x4800>;
interrupts = <0 94 0>;
qcom,device-type = <2>;
qcom,pipe-attr-ee;
clocks = <&clock_rpm clk_pnoc_sps_clk>,
<&clock_gcc clk_gcc_bam_dma_ahb_clk>;
clock-names = "dfab_clk", "dma_bam_pclk";
};