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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
11Also see these documents for generic binding information:
12 [1] GPIO : ../gpio/gpio.txt
13
14And these for relevant defines:
15 [2] include/dt-bindings/pinctrl/lochnagar.h
16 [3] include/dt-bindings/clock/lochnagar.h
17
18And these documents for the required sub-node binding details:
19 [4] Clock: ../clock/cirrus,lochnagar.txt
20 [5] Pinctrl: ../pinctrl/cirrus,lochnagar.txt
21 [6] Regulator: ../regulator/cirrus,lochnagar.txt
22
23Required properties:
24
25 - compatible : One of the following strings:
26 "cirrus,lochnagar1"
27 "cirrus,lochnagar2"
28
29 - reg : I2C slave address
30
31 - reset-gpios : Reset line to the Lochnagar, see [1].
32
33Required sub-nodes:
34
35 - lochnagar-clk : Binding for the clocking components, see [4].
36
37 - lochnagar-pinctrl : Binding for the pin control components, see [5].
38
39Optional sub-nodes:
40
41 - Bindings for the regulator components, see [6]. Only available on
42 Lochnagar 2.
43
44Optional properties:
45
46 - present-gpios : Host present line, indicating the presence of a
47 host system, see [1]. This can be omitted if the present line is
48 tied in hardware.
49
50Example:
51
52lochnagar: lochnagar@22 {
53 compatible = "cirrus,lochnagar2";
54 reg = <0x22>;
55
56 reset-gpios = <&gpio0 55 0>;
57 present-gpios = <&gpio0 60 0>;
58
59 lochnagar-clk {
60 compatible = "cirrus,lochnagar2-clk";
61 ...
62 };
63
64 lochnagar-pinctrl {
65 compatible = "cirrus,lochnagar-pinctrl";
66 ...
67 };
68};