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https://github.com/brain-hackers/u-boot-brain
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39dd00fc5d
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>
45 lines
1.3 KiB
Plaintext
45 lines
1.3 KiB
Plaintext
Fixed Voltage regulator
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Binding:
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The binding is done by the property "compatible" - this is different, than for
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binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt).
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Required properties:
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- compatible: "regulator-fixed"
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- regulator-name: this is required by the regulator uclass
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Optional properties:
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- gpio: GPIO to use for enable control
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- startup-delay-us: startup time in microseconds
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- u-boot,off-on-delay-us: off delay time in microseconds
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- regulator constraints (binding info: regulator.txt)
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- enable-active-high: Polarity of GPIO is Active high. If this property
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is missing, the default assumed is Active low.
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Other kernel-style properties, are currently not used.
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Note:
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For the regulator constraints, driver expects that:
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- regulator-min-microvolt is equal to regulator-max-microvolt
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- regulator-min-microamp is equal to regulator-max-microamp
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Example:
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fixed_regulator@0 {
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/* Mandatory */
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compatible = "regulator-fixed";
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regulator-name = "LED_3.3V";
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/* Optional: */
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gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
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/* Optional for regulator uclass */
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regulator-min-microvolt = <3300000>;
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regulator-max-microvolt = <3300000>;
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regulator-min-microamp = <15000>;
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regulator-max-microamp = <15000>;
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regulator-always-on;
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regulator-boot-on;
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enable-active-high;
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};
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