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1Cirrus Logic Lochnagar Audio Development Board
2
3Lochnagar is an evaluation and development board for Cirrus Logic
4Smart CODEC and Amp devices. It allows the connection of most Cirrus
5Logic devices on mini-cards, as well as allowing connection of
6various application processor systems to provide a full evaluation
7platform. Audio system topology, clocking and power can all be
8controlled through the Lochnagar, allowing the device under test
9to be used in a variety of possible use cases.
10
11This binding document describes the binding for the regulator portion
12of the driver.
13
14Also see these documents for generic binding information:
15 [1] Regulator: ../regulator/regulator.txt
16
17This binding must be part of the Lochnagar MFD binding:
18 [2] ../mfd/cirrus,lochnagar.txt
19
20Optional sub-nodes:
21
22 - VDDCORE : Initialisation data for the VDDCORE regulator, which
23 supplies the CODECs digital core if it has no build regulator for that
24 purpose.
25 Required Properties:
26 - compatible : One of the following strings:
27 "cirrus,lochnagar2-vddcore"
28 - SYSVDD-supply: Primary power supply for the Lochnagar.
29
30 - MICVDD : Initialisation data for the MICVDD regulator, which
31 supplies the CODECs MICVDD.
32 Required Properties:
33 - compatible : One of the following strings:
34 "cirrus,lochnagar2-micvdd"
35 - SYSVDD-supply: Primary power supply for the Lochnagar.
36
37 - MIC1VDD, MIC2VDD : Initialisation data for the MICxVDD supplies.
38 Required Properties:
39 - compatible : One of the following strings:
40 "cirrus,lochnagar2-mic1vdd", "cirrus,lochnagar2-mic2vdd"
41 Optional Properties:
42 - cirrus,micbias-input : A property selecting which of the CODEC
43 minicard micbias outputs should be used, valid values are 1 - 4.
44 - MICBIAS1-supply, MICBIAS2-supply: Regulator supplies for the
45 MICxVDD outputs, supplying the digital microphones, normally
46 supplied from the attached CODEC.
47
48 - VDD1V8 : Recommended fixed regulator for the VDD1V8 regulator, which supplies the
49 CODECs analog and 1.8V digital supplies.
50 Required Properties:
51 - compatible : Should be set to "regulator-fixed"
52 - regulator-min-microvolt : Should be set to 1.8V
53 - regulator-max-microvolt : Should be set to 1.8V
54 - regulator-boot-on
55 - regulator-always-on
56 - vin-supply : Should be set to same supply as SYSVDD
57
58Example:
59
60lochnagar {
61 lochnagar-micvdd: MICVDD {
62 compatible = "cirrus,lochnagar2-micvdd";
63
64 SYSVDD-supply = <&wallvdd>;
65
66 regulator-min-microvolt = <3300000>;
67 regulator-max-microvolt = <3300000>;
68 };
69
70 lochnagar-vdd1v8: VDD1V8 {
71 compatible = "regulator-fixed";
72
73 regulator-name = "VDD1V8";
74 regulator-min-microvolt = <1800000>;
75 regulator-max-microvolt = <1800000>;
76 regulator-boot-on;
77 regulator-always-on;
78
79 vin-supply = <&wallvdd>;
80 };
81};
82