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u-boot/doc/device-tree-bindings/regulator/fixed.txt

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dm: regulator: add fixed voltage regulator driver This driver implements regulator operations for fixed Voltage/Current value regulators. beside the standard regulator constraints, which are put into the uclass platform data, a typical fixed regulator node provides few additional properties like: - gpio - gpio-open-drain - enable-active-high - startup-delay-us The only 'gpio' is used by this driver and is kept in structure of type 'fixed_regulator_platdata', as a device platform data (dev->platdata). The driver implements: - get_value - get_current - get_enable - set_enable The regulator calls and commands can be used for fixed-regulator devices, and the proper error will be returned for prohibited. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>
2015-04-20 18:07:48 +00:00
Fixed Voltage regulator
Binding:
The binding is done by the property "compatible" - this is different, than for
binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt).
Required properties:
- compatible: "regulator-fixed"
- regulator-name: this is required by the regulator uclass
Optional properties:
- gpio: GPIO to use for enable control
regulator: fixed: obey startup delay When enabling a fixed regulator, it may take some time to rise to the correct voltage. If we do not delay here then subsequent operations will fail. Signed-off-by: John Keeping <john@metanate.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-08-22 14:10:09 +00:00
- startup-delay-us: startup time in microseconds
drivers: regulator: fixed: add u-boot, off-on-delay-us Add u-boot,off-on-delay-us for fixed regulator. Depends on board design, the gpio regulator sometimes connects with a big capacitance. When need to off, then on the regulator, if there is no enough delay, the voltage does not drop to 0, so introduce this property to handle such case. Signed-off-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Simon Glass <sjg@chromium.org> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-26 11:47:24 +00:00
- u-boot,off-on-delay-us: off delay time in microseconds
dm: regulator: add fixed voltage regulator driver This driver implements regulator operations for fixed Voltage/Current value regulators. beside the standard regulator constraints, which are put into the uclass platform data, a typical fixed regulator node provides few additional properties like: - gpio - gpio-open-drain - enable-active-high - startup-delay-us The only 'gpio' is used by this driver and is kept in structure of type 'fixed_regulator_platdata', as a device platform data (dev->platdata). The driver implements: - get_value - get_current - get_enable - set_enable The regulator calls and commands can be used for fixed-regulator devices, and the proper error will be returned for prohibited. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>
2015-04-20 18:07:48 +00:00
- regulator constraints (binding info: regulator.txt)
regulator: fixed: Add support to handle enable-active-high DT property Add support to handle enable-active-high DT property. This property is used to drive the gpio controlling fixed regulator as active high when claiming gpio line. Signed-off-by: Vignesh R <vigneshr@ti.com> Acked-by: Simon Glass <sjg@chromium.org>
2016-12-07 11:25:06 +00:00
- enable-active-high: Polarity of GPIO is Active high. If this property
is missing, the default assumed is Active low.
dm: regulator: add fixed voltage regulator driver This driver implements regulator operations for fixed Voltage/Current value regulators. beside the standard regulator constraints, which are put into the uclass platform data, a typical fixed regulator node provides few additional properties like: - gpio - gpio-open-drain - enable-active-high - startup-delay-us The only 'gpio' is used by this driver and is kept in structure of type 'fixed_regulator_platdata', as a device platform data (dev->platdata). The driver implements: - get_value - get_current - get_enable - set_enable The regulator calls and commands can be used for fixed-regulator devices, and the proper error will be returned for prohibited. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>
2015-04-20 18:07:48 +00:00
Other kernel-style properties, are currently not used.
Note:
For the regulator constraints, driver expects that:
- regulator-min-microvolt is equal to regulator-max-microvolt
- regulator-min-microamp is equal to regulator-max-microamp
Example:
fixed_regulator@0 {
/* Mandatory */
compatible = "regulator-fixed";
regulator-name = "LED_3.3V";
/* Optional: */
gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
/* Optional for regulator uclass */
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-min-microamp = <15000>;
regulator-max-microamp = <15000>;
regulator-always-on;
regulator-boot-on;
regulator: fixed: Add support to handle enable-active-high DT property Add support to handle enable-active-high DT property. This property is used to drive the gpio controlling fixed regulator as active high when claiming gpio line. Signed-off-by: Vignesh R <vigneshr@ti.com> Acked-by: Simon Glass <sjg@chromium.org>
2016-12-07 11:25:06 +00:00
enable-active-high;
dm: regulator: add fixed voltage regulator driver This driver implements regulator operations for fixed Voltage/Current value regulators. beside the standard regulator constraints, which are put into the uclass platform data, a typical fixed regulator node provides few additional properties like: - gpio - gpio-open-drain - enable-active-high - startup-delay-us The only 'gpio' is used by this driver and is kept in structure of type 'fixed_regulator_platdata', as a device platform data (dev->platdata). The driver implements: - get_value - get_current - get_enable - set_enable The regulator calls and commands can be used for fixed-regulator devices, and the proper error will be returned for prohibited. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>
2015-04-20 18:07:48 +00:00
};
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