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18c0556233
Add bindings documentation for Exynos PMU hardware block. It was taken from Linux kernel [1], but minimized and modified to reflect features that will be actually supported in U-Boot soon. For example, the "samsung,uart-debug-1" property is not available in Linux kernel bindings and only present in U-Boot. [1] Documentation/devicetree/bindings/soc/samsung/exynos-pmu.yaml Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
86 lines
2.4 KiB
YAML
86 lines
2.4 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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$id: http://devicetree.org/schemas/soc/samsung/exynos-pmu.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Samsung Exynos SoC series Power Management Unit (PMU)
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maintainers:
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- Sam Protsenko <semen.protsenko@linaro.org>
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description: |+
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PMU block controls the power and operation states of Exynos SoC. It contains
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registers for changing the state of next features::
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- Local power control. Exynos SoCs have various power domains, and it's
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possible to turn them on and off independently, using corresponding
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registers in PMU block
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- System-level power control. That allows putting the system into power-down
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modes (sleep) by turning off the power for most of the domains
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- Miscellaneous PMU related features
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# Custom select to avoid matching all nodes with 'syscon'
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select:
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properties:
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compatible:
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contains:
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enum:
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- samsung,exynos850-pmu
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required:
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- compatible
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properties:
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compatible:
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oneOf:
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- items:
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- enum:
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- samsung,exynos850-pmu
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- const: syscon
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reg:
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maxItems: 1
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samsung,uart-debug-1:
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type: boolean
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description:
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Enable this property if AP UART lines (Application Processor UART) must be
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connected to UART_DEBUG_1 path in PMU block. That's usually needed when
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the serial console is provided by uart1_pins. If this property is not
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specified, the default behavior will be used (AP UART lines connected to
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UART_DEBUG_0 path, which usually means uart0_pins are used for the serial
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console).
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syscon-poweroff:
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$ref: /schemas/power/reset/syscon-poweroff.yaml#
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type: object
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description:
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Node for power off method
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syscon-reboot:
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$ref: /schemas/power/reset/syscon-reboot.yaml#
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type: object
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description:
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Node for reboot method
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required:
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- compatible
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- reg
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additionalProperties: false
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examples:
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- |
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pmu_system_controller: system-controller@11860000 {
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compatible = "samsung,exynos850-pmu", "syscon";
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reg = <0x11860000 0x10000>;
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reboot: syscon-reboot {
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compatible = "syscon-reboot";
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regmap = <&pmu_system_controller>;
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offset = <0x3a00>; /* SYSTEM_CONFIGURATION */
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mask = <0x2>; /* SWRESET_SYSTEM */
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value = <0x2>; /* reset value */
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};
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};
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