mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.8 KiB
61 lines
1.8 KiB
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 { |
|
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"; |
|
};
|
|
|