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74 lines
2.4 KiB
Plaintext
74 lines
2.4 KiB
Plaintext
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AS3711 is an I2C PMIC from Austria MicroSystems with multiple DCDC and LDO power
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supplies, a battery charger and an RTC. So far only bindings for the two stepup
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DCDC converters are defined. Other DCDC and LDO supplies are configured, using
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standard regulator properties, they must belong to a sub-node, called
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"regulators" and be called "sd1" to "sd4" and "ldo1" to "ldo8." Stepup converter
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configuration should be placed in a subnode, called "backlight."
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Compulsory properties:
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- compatible : must be "ams,as3711"
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- reg : specifies the I2C address
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To use the SU1 converter as a backlight source the following two properties must
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be provided:
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- su1-dev : framebuffer phandle
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- su1-max-uA : maximum current
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To use the SU2 converter as a backlight source the following two properties must
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be provided:
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- su2-dev : framebuffer phandle
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- su1-max-uA : maximum current
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Additionally one of these properties must be provided to select the type of
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feedback used:
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- su2-feedback-voltage : voltage feedback is used
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- su2-feedback-curr1 : CURR1 input used for current feedback
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- su2-feedback-curr2 : CURR2 input used for current feedback
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- su2-feedback-curr3 : CURR3 input used for current feedback
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- su2-feedback-curr-auto: automatic current feedback selection
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and one of these to select the over-voltage protection pin
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- su2-fbprot-lx-sd4 : LX_SD4 is used for over-voltage protection
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- su2-fbprot-gpio2 : GPIO2 is used for over-voltage protection
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- su2-fbprot-gpio3 : GPIO3 is used for over-voltage protection
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- su2-fbprot-gpio4 : GPIO4 is used for over-voltage protection
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If "su2-feedback-curr-auto" is selected, one or more of the following properties
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have to be specified:
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- su2-auto-curr1 : use CURR1 input for current feedback
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- su2-auto-curr2 : use CURR2 input for current feedback
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- su2-auto-curr3 : use CURR3 input for current feedback
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Example:
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as3711@40 {
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compatible = "ams,as3711";
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reg = <0x40>;
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regulators {
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sd4 {
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regulator-name = "1.215V";
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regulator-min-microvolt = <1215000>;
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regulator-max-microvolt = <1235000>;
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};
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ldo2 {
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regulator-name = "2.8V CPU";
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regulator-min-microvolt = <2800000>;
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regulator-max-microvolt = <2800000>;
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regulator-always-on;
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regulator-boot-on;
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};
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};
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backlight {
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compatible = "ams,as3711-bl";
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su2-dev = <&lcdc>;
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su2-max-uA = <36000>;
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su2-feedback-curr-auto;
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su2-fbprot-gpio4;
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su2-auto-curr1;
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su2-auto-curr2;
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su2-auto-curr3;
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};
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};
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