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A use case for controlling the boot mode is when the user wants to control the device boot by pushing a button without needing to go in user-space. Add a new backed for reboot mode where GPIOs are used to control the reboot-mode. The driver is able to scan a predefined list of GPIOs and return the magic value. Having the modes associated with the magic value generated based on the GPIO values, allows the reboot mode uclass to select the proper mode. Signed-off-by: Nandor Han <nandor.han@vaisala.com> Reviewed-by: Simon Glass <sjg@chromium.org>
20 lines
674 B
Text
20 lines
674 B
Text
GPIO Reboot Mode Configuration
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Required Properties:
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- compatible: must be "reboot-mode-gpio".
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- gpios: list of gpios that are used to calculate the reboot-mode magic value.
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Every gpio represents a bit in the magic value in the same order
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as defined in device tree.
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- modes: list of properties that define the modes and associated unique ids.
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Optional Properties:
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- u-boot,env-variable: used to save the reboot mode (default: reboot-mode).
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Example:
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reboot-mode {
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compatible = "reboot-mode-gpio";
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gpios = <&gpio1 2 GPIO_ACTIVE_LOW>, <&gpio2 6 GPIO_ACTIVE_HIGH>;
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u-boot,env-variable = "bootstatus";
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mode-test = <0x00000001>;
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mode-download = <0x00000002>;
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};
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