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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/sophgo/sophgo,cv1800b-rtc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Real Time Clock of the Sophgo CV1800 SoC
description:
The RTC (Real Time Clock) is an independently powered module in the chip. It
contains a 32KHz oscillator and a Power-On-Reset (POR) sub-module, which can
be used for time display and scheduled alarm produce. In addition, the
hardware state machine provides triggering and timing control for chip
power-on, power-off and reset.
Furthermore, the 8051 subsystem is located within RTCSYS and is independently
powered. System software can use the 8051 to manage wake conditions and wake
the system while the system is asleep, and communicate with external devices
through peripheral controllers.
Technical Reference Manual available at
https://github.com/sophgo/sophgo-doc/tree/main/SG200X/TRM
maintainers:
- sophgo@lists.linux.dev
allOf:
- $ref: /schemas/rtc/rtc.yaml#
properties:
compatible:
items:
- const: sophgo,cv1800b-rtc
- const: syscon
reg:
maxItems: 1
interrupts:
items:
- description: RTC Alarm
- description: RTC Longpress
- description: VBAT DET
interrupt-names:
items:
- const: alarm
- const: longpress
- const: vbat
clocks:
items:
- description: RTC clock source
- description: DW8051 MCU clock source
clock-names:
items:
- const: rtc
- const: mcu
required:
- compatible
- reg
- interrupts
- interrupt-names
- clocks
- clock-names
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/clock/sophgo,cv1800.h>
#include <dt-bindings/interrupt-controller/irq.h>
rtc@5025000 {
compatible = "sophgo,cv1800b-rtc", "syscon";
reg = <0x5025000 0x2000>;
interrupts = <17 IRQ_TYPE_LEVEL_HIGH>,
<18 IRQ_TYPE_LEVEL_HIGH>,
<19 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "alarm", "longpress", "vbat";
clocks = <&clk CLK_RTC_25M>,
<&clk CLK_SRC_RTC_SYS_0>;
clock-names = "rtc", "mcu";
};
|
