forked from Minki/linux
a64efe15cf
Add device tree binding support for the QCOM ADM DMA driver. Signed-off-by: Andy Gross <agross@codeaurora.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
QCOM ADM DMA Controller
|
|
|
|
Required properties:
|
|
- compatible: must contain "qcom,adm" for IPQ/APQ8064 and MSM8960
|
|
- reg: Address range for DMA registers
|
|
- interrupts: Should contain one interrupt shared by all channels
|
|
- #dma-cells: must be <2>. First cell denotes the channel number. Second cell
|
|
denotes CRCI (client rate control interface) flow control assignment.
|
|
- clocks: Should contain the core clock and interface clock.
|
|
- clock-names: Must contain "core" for the core clock and "iface" for the
|
|
interface clock.
|
|
- resets: Must contain an entry for each entry in reset names.
|
|
- reset-names: Must include the following entries:
|
|
- clk
|
|
- c0
|
|
- c1
|
|
- c2
|
|
- qcom,ee: indicates the security domain identifier used in the secure world.
|
|
|
|
Example:
|
|
adm_dma: dma@18300000 {
|
|
compatible = "qcom,adm";
|
|
reg = <0x18300000 0x100000>;
|
|
interrupts = <0 170 0>;
|
|
#dma-cells = <2>;
|
|
|
|
clocks = <&gcc ADM0_CLK>, <&gcc ADM0_PBUS_CLK>;
|
|
clock-names = "core", "iface";
|
|
|
|
resets = <&gcc ADM0_RESET>,
|
|
<&gcc ADM0_C0_RESET>,
|
|
<&gcc ADM0_C1_RESET>,
|
|
<&gcc ADM0_C2_RESET>;
|
|
reset-names = "clk", "c0", "c1", "c2";
|
|
qcom,ee = <0>;
|
|
};
|
|
|
|
DMA clients must use the format descripted in the dma.txt file, using a three
|
|
cell specifier for each channel.
|
|
|
|
Each dmas request consists of 3 cells:
|
|
1. phandle pointing to the DMA controller
|
|
2. channel number
|
|
3. CRCI assignment, if applicable. If no CRCI flow control is required, use 0.
|
|
The CRCI is used for flow control. It identifies the peripheral device that
|
|
is the source/destination for the transferred data.
|
|
|
|
Example:
|
|
|
|
spi4: spi@1a280000 {
|
|
status = "ok";
|
|
spi-max-frequency = <50000000>;
|
|
|
|
pinctrl-0 = <&spi_pins>;
|
|
pinctrl-names = "default";
|
|
|
|
cs-gpios = <&qcom_pinmux 20 0>;
|
|
|
|
dmas = <&adm_dma 6 9>,
|
|
<&adm_dma 5 10>;
|
|
dma-names = "rx", "tx";
|
|
};
|