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as3711.txt

as3711.txt 2.4 KB
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  1. AS3711 is an I2C PMIC from Austria MicroSystems with multiple DCDC and LDO power
    2. 

  2. supplies, a battery charger and an RTC. So far only bindings for the two stepup
    3. 

  3. DCDC converters are defined. Other DCDC and LDO supplies are configured, using
    4. 

  4. standard regulator properties, they must belong to a sub-node, called
    5. 

  5. "regulators" and be called "sd1" to "sd4" and "ldo1" to "ldo8." Stepup converter
    6. 

  6. configuration should be placed in a subnode, called "backlight."
    7. 

  7. 

  8. Compulsory properties:
    9. 

  9. - compatible		: must be "ams,as3711"
    10. 

  10. - reg			: specifies the I2C address
    11. 

  11. 

  12. To use the SU1 converter as a backlight source the following two properties must
    13. 

  13. be provided:
    14. 

  14. - su1-dev		: framebuffer phandle
    15. 

  15. - su1-max-uA		: maximum current
    16. 

  16. 

  17. To use the SU2 converter as a backlight source the following two properties must
    18. 

  18. be provided:
    19. 

  19. - su2-dev		: framebuffer phandle
    20. 

  20. - su1-max-uA		: maximum current
    21. 

  21. 

  22. Additionally one of these properties must be provided to select the type of
    23. 

  23. feedback used:
    24. 

  24. - su2-feedback-voltage	: voltage feedback is used
    25. 

  25. - su2-feedback-curr1	: CURR1 input used for current feedback
    26. 

  26. - su2-feedback-curr2	: CURR2 input used for current feedback
    27. 

  27. - su2-feedback-curr3	: CURR3 input used for current feedback
    28. 

  28. - su2-feedback-curr-auto: automatic current feedback selection
    29. 

  29. 

  30. and one of these to select the over-voltage protection pin
    31. 

  31. - su2-fbprot-lx-sd4	: LX_SD4 is used for over-voltage protection
    32. 

  32. - su2-fbprot-gpio2	: GPIO2 is used for over-voltage protection
    33. 

  33. - su2-fbprot-gpio3	: GPIO3 is used for over-voltage protection
    34. 

  34. - su2-fbprot-gpio4	: GPIO4 is used for over-voltage protection
    35. 

  35. 

  36. If "su2-feedback-curr-auto" is selected, one or more of the following properties
    37. 

  37. have to be specified:
    38. 

  38. - su2-auto-curr1	: use CURR1 input for current feedback
    39. 

  39. - su2-auto-curr2	: use CURR2 input for current feedback
    40. 

  40. - su2-auto-curr3	: use CURR3 input for current feedback
    41. 

  41. 

  42. Example:
    43. 

  43. 

  44. as3711@40 {
    45. 

  45. 	compatible = "ams,as3711";
    46. 

  46. 	reg = <0x40>;
    47. 

  47. 

  48. 	regulators {
    49. 

  49. 		sd4 {
    50. 

  50. 			regulator-name = "1.215V";
    51. 

  51. 			regulator-min-microvolt = <1215000>;
    52. 

  52. 			regulator-max-microvolt = <1235000>;
    53. 

  53. 		};
    54. 

  54. 		ldo2 {
    55. 

  55. 			regulator-name = "2.8V CPU";
    56. 

  56. 			regulator-min-microvolt = <2800000>;
    57. 

  57. 			regulator-max-microvolt = <2800000>;
    58. 

  58. 			regulator-always-on;
    59. 

  59. 			regulator-boot-on;
    60. 

  60. 		};
    61. 

  61. 	};
    62. 

  62. 

  63. 	backlight {
    64. 

  64. 		compatible = "ams,as3711-bl";
    65. 

  65. 		su2-dev = <&lcdc>;
    66. 

  66. 		su2-max-uA = <36000>;
    67. 

  67. 		su2-feedback-curr-auto;
    68. 

  68. 		su2-fbprot-gpio4;
    69. 

  69. 		su2-auto-curr1;
    70. 

  70. 		su2-auto-curr2;
    71. 

  71. 		su2-auto-curr3;
    72. 

  72. 	};
    73. 

  73. };
    74.