1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
Binding for Qualcomm Technologies, Inc. WLED driver
WLED (White Light Emitting Diode) driver is used for controlling display
backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
platforms. The PMIC is connected to the host processor via SPMI bus.
- compatible
Usage: required
Value type: <string>
Definition: should be one of:
"qcom,pm8941-wled"
"qcom,pmi8998-wled"
"qcom,pm660l-wled"
- reg
Usage: required
Value type: <prop encoded array>
Definition: Base address of the WLED modules.
- default-brightness
Usage: optional
Value type: <u32>
Definition: brightness value on boot, value from: 0-4095
Default: 2048
- label
Usage: required
Value type: <string>
Definition: The name of the backlight device
- qcom,cs-out
Usage: optional
Value type: <bool>
Definition: enable current sink output.
This property is supported only for PM8941.
- qcom,cabc
Usage: optional
Value type: <bool>
Definition: enable content adaptive backlight control.
- qcom,ext-gen
Usage: optional
Value type: <bool>
Definition: use externally generated modulator signal to dim.
This property is supported only for PM8941.
- qcom,current-limit
Usage: optional
Value type: <u32>
Definition: mA; per-string current limit
value: For pm8941: from 0 to 25 with 5 mA step
Default 20 mA.
For pmi8998: from 0 to 30 with 5 mA step
Default 25 mA.
- qcom,current-boost-limit
Usage: optional
Value type: <u32>
Definition: mA; boost current limit.
For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
1680. Default: 805 mA
For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
1500. Default: 970 mA
- qcom,switching-freq
Usage: optional
Value type: <u32>
Definition: kHz; switching frequency; one of: 600, 640, 685, 738,
800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
4800, 9600.
Default: for pm8941: 1600 kHz
for pmi8998: 800 kHz
- qcom,ovp
Usage: optional
Value type: <u32>
Definition: V; Over-voltage protection limit; one of:
27, 29, 32, 35. default: 29V
This property is supported only for PM8941.
- qcom,num-strings
Usage: optional
Value type: <u32>
Definition: #; number of led strings attached;
value from 1 to 3. default: 2
This property is supported only for PM8941.
Example:
pm8941-wled@d800 {
compatible = "qcom,pm8941-wled";
reg = <0xd800>;
label = "backlight";
qcom,cs-out;
qcom,current-limit = <20>;
qcom,current-boost-limit = <805>;
qcom,switching-freq = <1600>;
qcom,ovp = <29>;
qcom,num-strings = <2>;
};
|
