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51bb1f6d46
On Apple Silicon machines a clean shutdown or reboot requires talking to SMC and writing to NVMEM cells. Add a binding for this MFD sub-device. Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Neal Gompa <neal@gompa.dev> Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org> Signed-off-by: Sven Peter <sven@kernel.org> Link: https://lore.kernel.org/r/20250610-smc-6-15-v7-2-556cafd771d3@kernel.org Signed-off-by: Lee Jones <lee@kernel.org>
41 lines
1.1 KiB
YAML
41 lines
1.1 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/power/reset/apple,smc-reboot.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Apple SMC Reboot Controller
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description:
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The Apple System Management Controller (SMC) provides reboot functionality
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on Apple Silicon SoCs. It uses NVMEM cells to store and track various
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system state information related to boot, shutdown, and panic events.
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maintainers:
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- Sven Peter <sven@kernel.org>
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properties:
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compatible:
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const: apple,smc-reboot
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nvmem-cells:
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items:
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- description: Flag indicating shutdown (as opposed to reboot)
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- description: Stage at which the boot process stopped (0x30 for normal boot)
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- description: Counter for boot errors
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- description: Counter for system panics
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nvmem-cell-names:
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items:
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- const: shutdown_flag
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- const: boot_stage
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- const: boot_error_count
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- const: panic_count
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required:
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- compatible
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- nvmem-cells
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- nvmem-cell-names
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additionalProperties: false
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