87 lines
2.2 KiB
YAML
87 lines
2.2 KiB
YAML
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# 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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$id: http://devicetree.org/schemas/rtc/sophgo,cv1800b-rtc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Real Time Clock of the Sophgo CV1800 SoC
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description:
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The RTC (Real Time Clock) is an independently powered module in the chip. It
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contains a 32KHz oscillator and a Power-On-Reset (POR) sub-module, which can
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be used for time display and scheduled alarm produce. In addition, the
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hardware state machine provides triggering and timing control for chip
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power-on, power-off and reset.
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Furthermore, the 8051 subsystem is located within RTCSYS and is independently
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powered. System software can use the 8051 to manage wake conditions and wake
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the system while the system is asleep, and communicate with external devices
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through peripheral controllers.
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Technical Reference Manual available at
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https://github.com/sophgo/sophgo-doc/tree/main/SG200X/TRM
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maintainers:
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- sophgo@lists.linux.dev
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allOf:
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- $ref: /schemas/rtc/rtc.yaml#
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properties:
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compatible:
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items:
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- const: sophgo,cv1800b-rtc
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- const: syscon
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reg:
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maxItems: 1
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interrupts:
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items:
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- description: RTC Alarm
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- description: RTC Longpress
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- description: VBAT DET
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interrupt-names:
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items:
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- const: alarm
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- const: longpress
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- const: vbat
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clocks:
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items:
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- description: RTC clock source
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- description: DW8051 MCU clock source
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clock-names:
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items:
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- const: rtc
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- const: mcu
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required:
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- compatible
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- reg
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- interrupts
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- interrupt-names
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- clocks
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- clock-names
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/clock/sophgo,cv1800.h>
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#include <dt-bindings/interrupt-controller/irq.h>
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rtc@5025000 {
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compatible = "sophgo,cv1800b-rtc", "syscon";
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reg = <0x5025000 0x2000>;
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interrupts = <17 IRQ_TYPE_LEVEL_HIGH>,
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<18 IRQ_TYPE_LEVEL_HIGH>,
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<19 IRQ_TYPE_LEVEL_HIGH>;
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interrupt-names = "alarm", "longpress", "vbat";
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clocks = <&clk CLK_RTC_25M>,
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<&clk CLK_SRC_RTC_SYS_0>;
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clock-names = "rtc", "mcu";
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};
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