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 --- Changes in v2: - (none)
.../soc/samsung/exynos-pmu.yaml | 85 +++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml
diff --git a/doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml b/doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml new file mode 100644 index 000000000000..c3e95c33b01d --- /dev/null +++ b/doc/device-tree-bindings/soc/samsung/exynos-pmu.yaml @@ -0,0 +1,85 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/soc/samsung/exynos-pmu.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung Exynos SoC series Power Management Unit (PMU) + +maintainers: + - Sam Protsenko semen.protsenko@linaro.org + +description: |+ + PMU block controls the power and operation states of Exynos SoC. It contains + registers for changing the state of next features:: + + - Local power control. Exynos SoCs have various power domains, and it's + possible to turn them on and off independently, using corresponding + registers in PMU block + - System-level power control. That allows putting the system into power-down + modes (sleep) by turning off the power for most of the domains + - Miscellaneous PMU related features + +# Custom select to avoid matching all nodes with 'syscon' +select: + properties: + compatible: + contains: + enum: + - samsung,exynos850-pmu + required: + - compatible + +properties: + compatible: + oneOf: + - items: + - enum: + - samsung,exynos850-pmu + - const: syscon + + reg: + maxItems: 1 + + samsung,uart-debug-1: + type: boolean + description: + Enable this property if AP UART lines (Application Processor UART) must be + connected to UART_DEBUG_1 path in PMU block. That's usually needed when + the serial console is provided by uart1_pins. If this property is not + specified, the default behavior will be used (AP UART lines connected to + UART_DEBUG_0 path, which usually means uart0_pins are used for the serial + console). + + syscon-poweroff: + $ref: /schemas/power/reset/syscon-poweroff.yaml# + type: object + description: + Node for power off method + + syscon-reboot: + $ref: /schemas/power/reset/syscon-reboot.yaml# + type: object + description: + Node for reboot method + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + pmu_system_controller: system-controller@11860000 { + compatible = "samsung,exynos850-pmu", "syscon"; + reg = <0x11860000 0x10000>; + + reboot: syscon-reboot { + compatible = "syscon-reboot"; + regmap = <&pmu_system_controller>; + offset = <0x3a00>; /* SYSTEM_CONFIGURATION */ + mask = <0x2>; /* SWRESET_SYSTEM */ + value = <0x2>; /* reset value */ + }; + };