path: root/drivers/rtc/rtc-pcf2127.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * An I2C and SPI driver for the NXP PCF2127/29/31 RTC
 * Copyright 2013 Til-Technologies
 *
 * Author: Renaud Cerrato <r.cerrato@til-technologies.fr>
 *
 * Watchdog and tamper functions
 * Author: Bruno Thomsen <bruno.thomsen@gmail.com>
 *
 * PCF2131 support
 * Author: Hugo Villeneuve <hvilleneuve@dimonoff.com>
 *
 * based on the other drivers in this same directory.
 *
 * Datasheets: https://www.nxp.com/docs/en/data-sheet/PCF2127.pdf
 *             https://www.nxp.com/docs/en/data-sheet/PCF2131DS.pdf
 */

#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/watchdog.h>

/* Control register 1 */
#define PCF2127_REG_CTRL1		0x00
#define PCF2127_BIT_CTRL1_POR_OVRD		BIT(3)
#define PCF2127_BIT_CTRL1_TSF1			BIT(4)
#define PCF2127_BIT_CTRL1_STOP			BIT(5)
/* Control register 2 */
#define PCF2127_REG_CTRL2		0x01
#define PCF2127_BIT_CTRL2_AIE			BIT(1