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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
Binding for TI/National Semiconductor LP55xx Led Drivers
Required properties:
- compatible: one of
national,lp5521
national,lp5523
ti,lp55231
ti,lp5562
ti,lp8501
- reg: I2C slave address
- clock-mode: Input clock mode, (0: automode, 1: internal, 2: external)
Each child has own specific current settings
- led-cur: Current setting at each led channel (mA x10, 0 if led is not connected)
- max-cur: Maximun current at each led channel.
Optional properties:
- enable-gpio: GPIO attached to the chip's enable pin
- label: Used for naming LEDs
- pwr-sel: LP8501 specific property. Power selection for output channels.
0: D1~9 are connected to VDD
1: D1~6 with VDD, D7~9 with VOUT
2: D1~6 with VOUT, D7~9 with VDD
3: D1~9 are connected to VOUT
Alternatively, each child can have a specific channel name and trigger:
- chan-name (optional): name of channel
- linux,default-trigger (optional): see
Documentation/devicetree/bindings/leds/common.txt
example 1) LP5521
3 LED channels, external clock used. Channel names are 'lp5521_pri:channel0',
'lp5521_pri:channel1' and 'lp5521_pri:channel2', with a heartbeat trigger
on channel 0.
lp5521@32 {
compatible = "national,lp5521";
reg = <0x32>;
label = "lp5521_pri";
clock-mode = /bits/ 8 <2>;
chan0 {
led-cur = /bits/ 8 <0x2f>;
max-cur = /bits/ 8 <0x5f>;
linux,default-trigger = "heartbeat";
};
chan1 {
led-cur = /bits/ 8 <0x2f>;
max-cur = /bits/ 8 <0x5f>;
};
chan2 {
led-cur = /bits/ 8 <0x2f>;
max-cur = /bits/ 8 <0x5f>;
};
};
example 2) LP5523
9 LED channels with specific name. Internal clock used.
The I2C slave address is configurable with ASEL1 and ASEL0 pins.
Available addresses are 32/33/34/35h.
ASEL1 ASEL0 Address
-------------------------
GND GND 32h
GND VEN 33h
VEN GND 34h
VEN VEN 35h
lp5523@32 {
compatible = "national,lp5523";
reg = <0x32>;
clock-mode = /bits/ 8 <1>;
chan0 {
chan-name = "d1";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan1 {
chan-name = "d2";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan2 {
chan-name = "d3";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan3 {
chan-name = "d4";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan4 {
chan-name = "d5";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan5 {
chan-name = "d6";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan6 {
chan-name = "d7";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan7 {
chan-name = "d8";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan8 {
chan-name = "d9";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
};
example 3) LP5562
4 channels are defined.
lp5562@30 {
compatible = "ti,lp5562";
reg = <0x30>;
clock-mode = /bits/8 <2>;
chan0 {
chan-name = "R";
led-cur = /bits/ 8 <0x20>;
max-cur = /bits/ 8 <0x60>;
};
chan1 {
chan-name = "G";
led-cur = /bits/ 8 <0x20>;
max-cur = /bits/ 8 <0x60>;
};
chan2 {
chan-name = "B";
led-cur = /bits/ 8 <0x20>;
max-cur = /bits/ 8 <0x60>;
};
chan3 {
chan-name = "W";
led-cur = /bits/ 8 <0x20>;
max-cur = /bits/ 8 <0x60>;
};
};
example 4) LP8501
9 channels are defined. The 'pwr-sel' is LP8501 specific property.
Others are same as LP5523.
lp8501@32 {
compatible = "ti,lp8501";
reg = <0x32>;
clock-mode = /bits/ 8 <2>;
pwr-sel = /bits/ 8 <3>; /* D1~9 connected to VOUT */
chan0 {
chan-name = "d1";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan1 {
chan-name = "d2";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan2 {
chan-name = "d3";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan3 {
chan-name = "d4";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan4 {
chan-name = "d5";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan5 {
chan-name = "d6";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan6 {
chan-name = "d7";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan7 {
chan-name = "d8";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
chan8 {
chan-name = "d9";
led-cur = /bits/ 8 <0x14>;
max-cur = /bits/ 8 <0x20>;
};
};
|
