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64710af3 GL |
1 | AS3711 is an I2C PMIC from Austria MicroSystems with multiple DCDC and LDO power |
2 | supplies, a battery charger and an RTC. So far only bindings for the two stepup | |
3 | DCDC converters are defined. Other DCDC and LDO supplies are configured, using | |
4 | standard regulator properties, they must belong to a sub-node, called | |
5 | "regulators" and be called "sd1" to "sd4" and "ldo1" to "ldo8." Stepup converter | |
6 | configuration should be placed in a subnode, called "backlight." | |
7 | ||
8 | Compulsory properties: | |
9 | - compatible : must be "ams,as3711" | |
10 | - reg : specifies the I2C address | |
11 | ||
12 | To use the SU1 converter as a backlight source the following two properties must | |
13 | be provided: | |
14 | - su1-dev : framebuffer phandle | |
15 | - su1-max-uA : maximum current | |
16 | ||
17 | To use the SU2 converter as a backlight source the following two properties must | |
18 | be provided: | |
19 | - su2-dev : framebuffer phandle | |
20 | - su1-max-uA : maximum current | |
21 | ||
22 | Additionally one of these properties must be provided to select the type of | |
23 | feedback used: | |
24 | - su2-feedback-voltage : voltage feedback is used | |
25 | - su2-feedback-curr1 : CURR1 input used for current feedback | |
26 | - su2-feedback-curr2 : CURR2 input used for current feedback | |
27 | - su2-feedback-curr3 : CURR3 input used for current feedback | |
28 | - su2-feedback-curr-auto: automatic current feedback selection | |
29 | ||
30 | and one of these to select the over-voltage protection pin | |
31 | - su2-fbprot-lx-sd4 : LX_SD4 is used for over-voltage protection | |
32 | - su2-fbprot-gpio2 : GPIO2 is used for over-voltage protection | |
33 | - su2-fbprot-gpio3 : GPIO3 is used for over-voltage protection | |
34 | - su2-fbprot-gpio4 : GPIO4 is used for over-voltage protection | |
35 | ||
36 | If "su2-feedback-curr-auto" is selected, one or more of the following properties | |
37 | have to be specified: | |
38 | - su2-auto-curr1 : use CURR1 input for current feedback | |
39 | - su2-auto-curr2 : use CURR2 input for current feedback | |
40 | - su2-auto-curr3 : use CURR3 input for current feedback | |
41 | ||
42 | Example: | |
43 | ||
44 | as3711@40 { | |
45 | compatible = "ams,as3711"; | |
46 | reg = <0x40>; | |
47 | ||
48 | regulators { | |
49 | sd4 { | |
50 | regulator-name = "1.215V"; | |
51 | regulator-min-microvolt = <1215000>; | |
52 | regulator-max-microvolt = <1235000>; | |
53 | }; | |
54 | ldo2 { | |
55 | regulator-name = "2.8V CPU"; | |
56 | regulator-min-microvolt = <2800000>; | |
57 | regulator-max-microvolt = <2800000>; | |
58 | regulator-always-on; | |
59 | regulator-boot-on; | |
60 | }; | |
61 | }; | |
62 | ||
63 | backlight { | |
64 | compatible = "ams,as3711-bl"; | |
65 | su2-dev = <&lcdc>; | |
66 | su2-max-uA = <36000>; | |
67 | su2-feedback-curr-auto; | |
68 | su2-fbprot-gpio4; | |
69 | su2-auto-curr1; | |
70 | su2-auto-curr2; | |
71 | su2-auto-curr3; | |
72 | }; | |
73 | }; |