rtc: pt7c4338: Add driver model support

Add support of driver model of pt7c4338

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

1 files changed, 100 insertions, 0 deletions

diff --git a/drivers/rtc/pt7c4338.c b/drivers/rtc/pt7c4338.c
index 6a19fe1d23..5211d07586 100644
--- a/drivers/rtc/pt7c4338.c
+++ b/drivers/rtc/pt7c4338.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2010 Freescale Semiconductor, Inc.
+ * Copyright 2020 NXP
  *
  * Author:	Priyanka Jain <Priyanka.Jain@freescale.com>
  */
@@ -19,6 +20,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <dm.h>
 #include <rtc.h>
 #include <i2c.h>
 
@@ -46,6 +48,7 @@
 #define RTC_PT7C4338_RESET_VAL \
 	(RTC_CTL_STAT_BIT_RS0 | RTC_CTL_STAT_BIT_RS1 | RTC_CTL_STAT_BIT_OUT)
 
+#if !CONFIG_IS_ENABLED(DM_RTC)
 /****** Helper functions ****************************************/
 static u8 rtc_read(u8 reg)
 {
@@ -125,3 +128,100 @@ void rtc_reset(void)
 	rtc_write(RTC_SEC_REG_ADDR, 0x00);	/* clearing Clock Halt	*/
 	rtc_write(RTC_CTL_STAT_REG_ADDR, RTC_PT7C4338_RESET_VAL);
 }
+#else
+static u8 rtc_read(struct udevice *dev, u8 reg)
+{
+	return dm_i2c_reg_read(dev, reg);
+}
+
+static void rtc_write(struct udevice *dev, u8 reg, u8 val)
+{
+	dm_i2c_reg_write(dev, reg, val);
+}
+
+static int pt7c4338_rtc_get(struct udevice *dev, struct rtc_time *tmp)
+{
+	int ret = 0;
+	u8 sec, min, hour, mday, wday, mon, year, ctl_stat;
+
+	ctl_stat = rtc_read(dev, RTC_CTL_STAT_REG_ADDR);
+	sec = rtc_read(dev, RTC_SEC_REG_ADDR);
+	min = rtc_read(dev, RTC_MIN_REG_ADDR);
+	hour = rtc_read(dev, RTC_HR_REG_ADDR);
+	wday = rtc_read(dev, RTC_DAY_REG_ADDR);
+	mday = rtc_read(dev, RTC_DATE_REG_ADDR);
+	mon = rtc_read(dev, RTC_MON_REG_ADDR);
+	year = rtc_read(dev, RTC_YR_REG_ADDR);
+	debug("Get RTC year: %02x mon: %02x mday: %02x wday: %02x\n",
+	      year, mon, mday, wday);
+	debug("hr: %02x min: %02x sec: %02x control_status: %02x\n",
+	      hour, min, sec, ctl_stat);
+
+	if (ctl_stat & RTC_CTL_STAT_BIT_OSF) {
+		printf("### Warning: RTC oscillator has stopped\n");
+		/* clear the OSF flag */
+		rtc_write(dev, RTC_CTL_STAT_REG_ADDR,
+			  rtc_read(dev,
+				   RTC_CTL_STAT_REG_ADDR)
+				   & ~RTC_CTL_STAT_BIT_OSF);
+		ret = -1;
+	}
+
+	tmp->tm_sec = bcd2bin(sec & 0x7F);
+	tmp->tm_min = bcd2bin(min & 0x7F);
+	tmp->tm_hour = bcd2bin(hour & 0x3F);
+	tmp->tm_mday = bcd2bin(mday & 0x3F);
+	tmp->tm_mon = bcd2bin(mon & 0x1F);
+	tmp->tm_year = bcd2bin(year) + 2000;
+	tmp->tm_wday = bcd2bin((wday - 1) & 0x07);
+	tmp->tm_yday = 0;
+	tmp->tm_isdst = 0;
+	debug("Get DATE: %4d-%02d-%02d [wday=%d]  TIME: %2d:%02d:%02d\n",
+	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	return ret;
+}
+
+static int pt7c4338_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
+{
+	debug("Set DATE: %4d-%02d-%02d [wday=%d]  TIME: %2d:%02d:%02d\n",
+	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	rtc_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));
+	rtc_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon));
+	rtc_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));
+	rtc_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));
+	rtc_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));
+	rtc_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));
+	rtc_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));
+
+	return 0;
+}
+
+static int pt7c4338_rtc_reset(struct udevice *dev)
+{
+	rtc_write(dev, RTC_SEC_REG_ADDR, 0x00);	/* clearing Clock Halt	*/
+	rtc_write(dev, RTC_CTL_STAT_REG_ADDR, RTC_PT7C4338_RESET_VAL);
+	return 0;
+}
+
+static const struct rtc_ops pt7c4338_rtc_ops = {
+	.get = pt7c4338_rtc_get,
+	.set = pt7c4338_rtc_set,
+	.reset = pt7c4338_rtc_reset,
+};
+
+static const struct udevice_id pt7c4338_rtc_ids[] = {
+	{ .compatible = "pericom,pt7c4338" },
+	{ }
+};
+
+U_BOOT_DRIVER(rtc_pt7c4338) = {
+	.name   = "rtc-pt7c4338",
+	.id     = UCLASS_RTC,
+	.of_match = pt7c4338_rtc_ids,
+	.ops    = &pt7c4338_rtc_ops,
+};
+#endif