| Guennadi Liakhovetski | 64710af | 2013-03-22 17:15:47 +0100 | [diff] [blame] | 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 | }; |