diff options
| author | Alex Frid <afrid@nvidia.com> | 2014-01-25 18:10:24 -0800 |
|---|---|---|
| committer | Gerrit Code Review <gerrit2@nvidia.com> | 2014-01-28 11:06:11 -0800 |
| commit | 85e3f38e02af75258c8e6c660b6d0bb67f693bac (patch) | |
| tree | 339eed33980704e3a039ff3d6405e73a4507295c /Documentation/devicetree/bindings | |
| parent | c55b81088a2a3add04f2efc3383700a2ebcbb8e5 (diff) | |
regulator: Define DT binding for PWM regulators
Added DT binding definition for regulators controlled by PWM
interface.
Bug 1442709
Change-Id: I753726236f4b1b33b54df258895b871cdc761f20
Signed-off-by: Alex Frid <afrid@nvidia.com>
Diffstat (limited to 'Documentation/devicetree/bindings')
| -rw-r--r-- | Documentation/devicetree/bindings/regulator/pwm-regulator.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt new file mode 100644 index 000000000000..ef560e1e2261 --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt @@ -0,0 +1,47 @@ +PWM controlled regulators + +Required properties: +- compatible : Must be "regulator-pwm". +- pwms : Must be pwm-list specified by pwm binding pwm.txt +- regulator-min-microvolt : Must be smallest voltage at pwm duty cycle 0% +- regulator-max-microvolt : Must be largest voltage at pwm duty cycle 100% + (must be above min; if equal, then use a fixed + regulator) + +Optional properties: +- regulator-n-voltages : number of voltages, if specified implies evenly + distributed duty cycle levels; must be at least 2 +- voltage-time-sel : time in microseconds of voltage transition between + voltage levels (specified if regulator settling time + is independent of voltage change; for regulators with + fixed slew-rate use regulator-ramp-delay property) + +Control GPIOs specified according to gpio binding in gpio.txt +- enable-gpio : GPIO to use to enable/disable the regulator +- idle-gpio : GPIO to use to enter/exit regulator idle mode +- standby-gpio : GPIO to use to enter/exit regulator standby mode + +Any property defined as part of the pwm user binding in pwm.txt. +Any property defined as part of the core regulator binding in regulator.txt. + +Example: + + pwm: pwm-controller { + #pwm-cells = <2>; + }; + + abc_pwm_reg: pwm-regulator { + compatible = "regulator-pwm"; + pwms = <&pwm 0 3000>; + regulator-min-microvolt = <1000000>; + regulator-max-microvolt = <2500000>; + + regulator-name = "vdd-abc-pwm-reg"; + regulator-enable-ramp-delay = <700>; + regulator-boot-on; + + regulator-n-voltages = <64>; + voltage-time-sel = <50>; + enable-gpio = <&gpio0 21 0x0>; + standby-gpio = <&gpio0 22 0x0>; + }; |