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Linux kernel mirror (for testing)
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1* Qualcomm Technologies LPASS CPU DAI
2
3This node models the Qualcomm Technologies Low-Power Audio SubSystem (LPASS).
4
5Required properties:
6
7- compatible : "qcom,lpass-cpu" or "qcom,apq8016-lpass-cpu"
8- clocks : Must contain an entry for each entry in clock-names.
9- clock-names : A list which must include the following entries:
10 * "ahbix-clk"
11 * "mi2s-osr-clk"
12 * "mi2s-bit-clk"
13 : required clocks for "qcom,lpass-cpu-apq8016"
14 * "ahbix-clk"
15 * "mi2s-bit-clk0"
16 * "mi2s-bit-clk1"
17 * "mi2s-bit-clk2"
18 * "mi2s-bit-clk3"
19 * "pcnoc-mport-clk"
20 * "pcnoc-sway-clk"
21
22- interrupts : Must contain an entry for each entry in
23 interrupt-names.
24- interrupt-names : A list which must include the following entries:
25 * "lpass-irq-lpaif"
26- pinctrl-N : One property must exist for each entry in
27 pinctrl-names. See ../pinctrl/pinctrl-bindings.txt
28 for details of the property values.
29- pinctrl-names : Must contain a "default" entry.
30- reg : Must contain an address for each entry in reg-names.
31- reg-names : A list which must include the following entries:
32 * "lpass-lpaif"
33- #address-cells : Must be 1
34- #size-cells : Must be 0
35
36
37
38Optional properties:
39
40- qcom,adsp : Phandle for the audio DSP node
41
42By default, the driver uses up to 4 MI2S SD lines, for a total of 8 channels.
43The SD lines to use can be configured by adding subnodes for each of the DAIs.
44
45Required properties for each DAI (represented by a subnode):
46- reg : Must be one of the DAI IDs
47 (usually part of dt-bindings header)
48- qcom,playback-sd-lines: List of serial data lines to use for playback
49 Each SD line should be represented by a number from 0-3.
50- qcom,capture-sd-lines : List of serial data lines to use for capture
51 Each SD line should be represented by a number from 0-3.
52
53Note that adding a subnode changes the default to "no lines configured",
54so both playback and capture lines should be configured when a subnode is added.
55
56Example:
57
58lpass@28100000 {
59 compatible = "qcom,lpass-cpu";
60 clocks = <&lcc AHBIX_CLK>, <&lcc MI2S_OSR_CLK>, <&lcc MI2S_BIT_CLK>;
61 clock-names = "ahbix-clk", "mi2s-osr-clk", "mi2s-bit-clk";
62 interrupts = <0 85 1>;
63 interrupt-names = "lpass-irq-lpaif";
64 pinctrl-names = "default", "idle";
65 pinctrl-0 = <&mi2s_default>;
66 pinctrl-1 = <&mi2s_idle>;
67 reg = <0x28100000 0x10000>;
68 reg-names = "lpass-lpaif";
69 qcom,adsp = <&adsp>;
70
71 #address-cells = <1>;
72 #size-cells = <0>;
73
74 /* Optional to set different MI2S SD lines */
75 dai@3 {
76 reg = <MI2S_QUATERNARY>;
77 qcom,playback-sd-lines = <0 1>;
78 };
79};