[U-Boot] [PATCH 39/42] rtc: pcf8563: support driver model

[Biwen Li]

This supports driver model to
drop warning as follows:
- drivers/rtc/pcf8563.c: In function rtc_read:
  drivers/rtc/pcf8563.c:111:10: warning: implicit declaration of function i2c_reg_read; did you mean dm_i2c_reg_read? [-Wimplicit-function-declaration
  drivers/rtc/pcf8563.c: In function rtc_write:
  drivers/rtc/pcf8563.c:116:2: warning: implicit declaration of function i2c_reg_write; did you mean dm_i2c_reg_write? [-Wimplicit-function-declaration]

Signed-off-by: Biwen Li <biwen.li at nxp.com>
---
 drivers/rtc/pcf8563.c | 107 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)

diff --git a/drivers/rtc/pcf8563.c b/drivers/rtc/pcf8563.c
index a839d6cc98..44204e133e 100644
--- a/drivers/rtc/pcf8563.c
+++ b/drivers/rtc/pcf8563.c
@@ -12,9 +12,11 @@
 
 #include <common.h>
 #include <command.h>
+#include <dm.h>
 #include <rtc.h>
 #include <i2c.h>
 
+#if !CONFIG_IS_ENABLED(DM_RTC)
 static uchar rtc_read  (uchar reg);
 static void  rtc_write (uchar reg, uchar val);
 
@@ -115,3 +117,108 @@ static void rtc_write (uchar reg, uchar val)
 {
 	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
 }
+#else
+static int pcf8563_rtc_get(struct udevice *dev, struct rtc_time *tmp)
+{
+	int rel = 0;
+	uchar sec, min, hour, mday, wday, mon_cent, year;
+
+	sec	= dm_i2c_reg_read(dev, 0x02);
+	min	= dm_i2c_reg_read(dev, 0x03);
+	hour	= dm_i2c_reg_read(dev, 0x04);
+	mday	= dm_i2c_reg_read(dev, 0x05);
+	wday	= dm_i2c_reg_read(dev, 0x06);
+	mon_cent = dm_i2c_reg_read(dev, 0x07);
+	year	= dm_i2c_reg_read(dev, 0x08);
+
+	debug ("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
+	       "hr: %02x min: %02x sec: %02x\n",
+	       year, mon_cent, mday, wday,
+	       hour, min, sec);
+	debug ("Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
+	       dm_i2c_reg_read(dev, 0x0C),
+	       dm_i2c_reg_read(dev, 0x0B),
+	       dm_i2c_reg_read(dev, 0x0A),
+	       dm_i2c_reg_read(dev, 0x09));
+
+	if (sec & 0x80) {
+		puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
+		rel = -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_cent & 0x1F);
+	tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
+	tmp->tm_wday = bcd2bin (wday & 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 rel;
+}
+
+static int pcf8563_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
+{
+	uchar century;
+
+	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);
+
+	dm_i2c_reg_write(dev, 0x08, bin2bcd(tmp->tm_year % 100));
+
+	century = (tmp->tm_year >= 2000) ? 0 : 0x80;
+	dm_i2c_reg_write(dev, 0x07, bin2bcd(tmp->tm_mon) | century);
+
+	dm_i2c_reg_write(dev, 0x06, bin2bcd(tmp->tm_wday));
+	dm_i2c_reg_write(dev, 0x05, bin2bcd(tmp->tm_mday));
+	dm_i2c_reg_write(dev, 0x04, bin2bcd(tmp->tm_hour));
+	dm_i2c_reg_write(dev, 0x03, bin2bcd(tmp->tm_min));
+	dm_i2c_reg_write(dev, 0x02, bin2bcd(tmp->tm_sec));
+
+	return 0;
+}
+
+static int pcf8563_rtc_reset(struct udevice *dev)
+{
+	/* clear all control & status registers */
+	dm_i2c_reg_write(dev, 0x00, 0x00);
+	dm_i2c_reg_write(dev, 0x01, 0x00);
+	dm_i2c_reg_write(dev, 0x0D, 0x00);
+
+	/* clear Voltage Low bit */
+	dm_i2c_reg_write(dev, 0x02, dm_i2c_reg_read (dev, 0x02) & 0x7F);
+
+	/* reset all alarms */
+	dm_i2c_reg_write(dev, 0x09, 0x00);
+	dm_i2c_reg_write(dev, 0x0A, 0x00);
+	dm_i2c_reg_write(dev, 0x0B, 0x00);
+	dm_i2c_reg_write(dev, 0x0C, 0x00);
+
+	return 0;
+}
+
+static const struct rtc_ops pcf8563_rtc_ops = {
+	.get = pcf8563_rtc_get,
+	.set = pcf8563_rtc_set,
+	.reset = pcf8563_rtc_reset,
+};
+
+static const struct udevice_id pcf8563_rtc_ids[] = {
+	{ .compatible = "nxp,pcf8563" },
+	{ }
+};
+
+U_BOOT_DRIVER(rtc_pcf8563) = {
+	.name   = "rtc-pcf8563",
+	.id     = UCLASS_RTC,
+	.of_match = pcf8563_rtc_ids,
+	.ops    = &pcf8563_rtc_ops,
+};
+#endif
-- 
2.17.1