[PATCH v7 02/10] dt-bindings: power: reboot: Add Apple Mac SMC Reboot Controller
From: Sven Peter <sven@kernel.org>
Date: 2025-06-10 16:10:39
Also in:
asahi, b4-sent, linux-devicetree, linux-gpio, linux-pm, lkml
Subsystem:
arm/apple machine support, open firmware and flattened device tree bindings, system reset/shutdown drivers, the rest · Maintainers:
Sven Peter, Janne Grunau, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Sebastian Reichel, Linus Torvalds
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 <redacted> Reviewed-by: Neal Gompa <neal@gompa.dev> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Sven Peter <sven@kernel.org> --- .../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..ce5ed88493cdb60bfc8b444cd9e1d36714890ffe
--- /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@kernel.org> + +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 68097b1a44251b076bfd55cc07cffa5d0e3e83c5..1dd004f7dff669e3a3609e5f1702887129d8ff35 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS@@ -2346,6 +2346,7 @@ F: Documentation/devicetree/bindings/nvmem/apple,spmi-nvmem.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/spmi/apple,spmi.yaml
--
2.34.1