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1495c1aa44
GS101 supports a couple different reset types via certain registers in the SYSCON register map. Add a compatible for it. When in effect, all register values and offsets are implied, hence they shall not be specified in that case. Signed-off-by: André Draszik <andre.draszik@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20250401-syscon-reboot-reset-mode-v5-1-5b9357442363@linaro.org Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
99 lines
2.4 KiB
YAML
99 lines
2.4 KiB
YAML
# SPDX-License-Identifier: GPL-2.0
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/power/reset/syscon-reboot.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Generic SYSCON mapped register reset driver
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maintainers:
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- Sebastian Reichel <sre@kernel.org>
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description: |+
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This is a generic reset driver using syscon to map the reset register.
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The reset is generally performed with a write to the reset register
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defined by the SYSCON register map base plus the offset with the value and
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mask defined in the reboot node. Default will be little endian mode, 32 bit
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access only. The SYSCON registers map is normally retrieved from the
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parental dt-node. So the SYSCON reboot node should be represented as a
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sub-node of a "syscon", "simple-mfd" node. Though the regmap property
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pointing to the system controller node is also supported.
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properties:
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compatible:
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enum:
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- syscon-reboot
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- google,gs101-reboot
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mask:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: Update only the register bits defined by the mask (32 bit).
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offset:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: Offset in the register map for the reboot register (in bytes).
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reg:
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maxItems: 1
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description: Base address and size for the reboot register.
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regmap:
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$ref: /schemas/types.yaml#/definitions/phandle
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deprecated: true
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description: |
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Phandle to the register map node. This property is deprecated in favor of
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the syscon-reboot node been a child of a system controller node.
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value:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: The reset value written to the reboot register (32 bit access).
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priority:
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default: 192
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required:
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- compatible
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additionalProperties: false
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allOf:
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- $ref: restart-handler.yaml#
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- if:
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properties:
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compatible:
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contains:
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const: google,gs101-reboot
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then:
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properties:
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mask: false
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offset: false
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reg: false
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value: false
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else:
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if:
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not:
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required:
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- mask
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then:
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required:
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- value
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oneOf:
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- required: [offset]
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- required: [reg]
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examples:
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- |
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reboot {
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compatible = "syscon-reboot";
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regmap = <®mapnode>;
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offset = <0x0>;
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mask = <0x1>;
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};
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- |
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reboot {
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compatible = "google,gs101-reboot";
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};
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