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-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: 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 (%)
-
-Optional properties for Continuous mode:
-- pwm-dutycycle-unit: Integer value encoding the duty cycle unit. If not
- defined, <100> is assumed, meaning that
- pwm-dutycycle-range contains values expressed in
- percent.
-
-- pwm-dutycycle-range: Should contain 2 entries. The first entry is encoding
- the dutycycle for regulator-min-microvolt and the
- second one the dutycycle for regulator-max-microvolt.
- Duty cycle values are expressed in pwm-dutycycle-unit.
- If not defined, <0 100> is assumed.
-
-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.
-
-Optional properties:
---------------------
-- enable-gpios: GPIO to use to enable/disable the regulator
-
-Any property defined as part of the core regulator binding can also be used.
-(See: ../regulator/regulator.txt)
-
-Continuous Voltage With Enable GPIO Example:
- pwm_regulator {
- compatible = "pwm-regulator";
- pwms = <&pwm1 0 8448 0>;
- enable-gpios = <&gpio0 23 GPIO_ACTIVE_HIGH>;
- regulator-min-microvolt = <1016000>;
- regulator-max-microvolt = <1114000>;
- regulator-name = "vdd_logic";
- /* unit == per-mille */
- pwm-dutycycle-unit = <1000>;
- /*
- * Inverted PWM logic, and the duty cycle range is limited
- * to 30%-70%.
- */
- pwm-dutycycle-range = <700 300>; /* */
- };
-
-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>;
- };