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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-12-15 14:52:16 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-12-15 14:52:16 -0300 |
commit | 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be (patch) | |
tree | e9891aa6c295060d065adffd610c4f49ecf884f3 /Documentation/devicetree/bindings/regulator/pwm-regulator.txt | |
parent | a71852147516bc1cb5b0b3cbd13639bfd4022dc8 (diff) |
Linux-libre 4.3.2-gnu
Diffstat (limited to 'Documentation/devicetree/bindings/regulator/pwm-regulator.txt')
-rw-r--r-- | Documentation/devicetree/bindings/regulator/pwm-regulator.txt | 65 |
1 files changed, 53 insertions, 12 deletions
diff --git a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt index ce91f61fe..ed936f0f3 100644 --- a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt +++ b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt @@ -1,27 +1,68 @@ -pwm regulator bindings +Bindings for the Generic PWM Regulator +====================================== + +Currently supports 2 modes of operation: + +Voltage Table: When in this mode, a voltage table (See below) of + predefined voltage <=> duty-cycle values must be + provided via DT. Limitations are that the regulator can + only operate at the voltages supplied in the table. + Intermediary duty-cycle values which would normally + allow finer grained voltage selection are ignored and + rendered useless. Although more control is given to + the user if the assumptions made in continuous-voltage + mode do not reign true. + +Continuous Voltage: This mode uses the regulator's maximum and minimum + supplied voltages specified in the + regulator-{min,max}-microvolt properties to calculate + appropriate duty-cycle values. This allows for a much + more fine grained solution when compared with + voltage-table mode above. This solution does make an + assumption that a %50 duty-cycle value will cause the + regulator voltage to run at half way between the + supplied max_uV and min_uV values. Required properties: -- compatible: Should be "pwm-regulator" -- pwms: OF device-tree PWM specification (see PWM binding pwm.txt) -- voltage-table: voltage and duty table, include 2 members in each set of - brackets, first one is voltage(unit: uv), the next is duty(unit: percent) +-------------------- +- compatible: Should be "pwm-regulator" + +- pwms: PWM specification (See: ../pwm/pwm.txt) + +Only required for Voltage Table Mode: +- voltage-table: Voltage and Duty-Cycle table consisting of 2 cells + First cell is voltage in microvolts (uV) + Second cell is duty-cycle in percent (%) + +NB: To be clear, if voltage-table is provided, then the device will be used +in Voltage Table Mode. If no voltage-table is provided, then the device will +be used in Continuous Voltage Mode. -Any property defined as part of the core regulator binding defined in -regulator.txt can also be used. +Any property defined as part of the core regulator binding can also be used. +(See: ../regulator/regulator.txt) -Example: +Continuous Voltage Example: pwm_regulator { compatible = "pwm-regulator; pwms = <&pwm1 0 8448 0>; + regulator-min-microvolt = <1016000>; + regulator-max-microvolt = <1114000>; + regulator-name = "vdd_logic"; + }; +Voltage Table Example: + pwm_regulator { + compatible = "pwm-regulator; + pwms = <&pwm1 0 8448 0>; + regulator-min-microvolt = <1016000>; + regulator-max-microvolt = <1114000>; + regulator-name = "vdd_logic"; + + /* Voltage Duty-Cycle */ voltage-table = <1114000 0>, <1095000 10>, <1076000 20>, <1056000 30>, <1036000 40>, <1016000 50>; - - regulator-min-microvolt = <1016000>; - regulator-max-microvolt = <1114000>; - regulator-name = "vdd_logic"; }; |