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Message-Id: <20250515-smc-6-15-v6-2-c47b1ef4b0ae@svenpeter.dev> Date: Thu, 15 May 2025 06:21:14 +0000 From: Sven Peter via B4 Relay <devnull+sven.svenpeter.dev@...nel.org> To: Sven Peter <sven@...npeter.dev>, Janne Grunau <j@...nau.net>, Alyssa Rosenzweig <alyssa@...enzweig.io>, Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>, Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Sebastian Reichel <sre@...nel.org>, Lee Jones <lee@...nel.org>, Marc Zyngier <maz@...nel.org>, "Russell King (Oracle)" <rmk+kernel@...linux.org.uk> Cc: asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org Subject: [PATCH v6 02/10] dt-bindings: power: reboot: Add Apple Mac SMC Reboot Controller From: Sven Peter <sven@...npeter.dev> 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@...enzweig.io> Reviewed-by: Neal Gompa <neal@...pa.dev> Reviewed-by: Rob Herring (Arm) <robh@...nel.org> Signed-off-by: Sven Peter <sven@...npeter.dev> --- .../bindings/power/reset/apple,smc-reboot.yaml | 40 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 41 insertions(+) diff --git a/Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml b/Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml new file mode 100644 index 0000000000000000000000000000000000000000..38d1b6ac9b813f278e1d6c25667cc7b4b0a56c57 --- /dev/null +++ b/Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml @@ -0,0 +1,40 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/power/reset/apple,smc-reboot.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple SMC Reboot Controller + +description: + The Apple System Management Controller (SMC) provides reboot functionality + on Apple Silicon SoCs. It uses NVMEM cells to store and track various + system state information related to boot, shutdown, and panic events. + +maintainers: + - Sven Peter <sven@...npeter.dev> + +properties: + compatible: + const: apple,smc-reboot + + nvmem-cells: + items: + - description: Flag indicating shutdown (as opposed to reboot) + - description: Stage at which the boot process stopped (0x30 for normal boot) + - description: Counter for boot errors + - description: Counter for system panics + + nvmem-cell-names: + items: + - const: shutdown_flag + - const: boot_stage + - const: boot_error_count + - const: panic_count + +required: + - compatible + - nvmem-cells + - nvmem-cell-names + +additionalProperties: false diff --git a/MAINTAINERS b/MAINTAINERS index b53f3929b06006f9f38f5cda048516891c18c7ab..3f32d028ab49994a0da9f3882f37b9c3b183f5b4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2281,6 +2281,7 @@ F: Documentation/devicetree/bindings/nvmem/apple,efuses.yaml F: Documentation/devicetree/bindings/pci/apple,pcie.yaml F: Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml F: Documentation/devicetree/bindings/power/apple* +F: Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml F: Documentation/devicetree/bindings/pwm/apple,s5l-fpwm.yaml F: Documentation/devicetree/bindings/spi/apple,spi.yaml F: Documentation/devicetree/bindings/watchdog/apple,wdt.yaml -- 2.34.1
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