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rtc: m41t62: Convert the RTC driver to support the driver model (DM)

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After this change the m41t62.c can be used with RTC subsystem (i.e. date
command) which uses device model (DM).

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Lukasz Majewski 2018-11-22 14:54:34 +01:00 committed by Tom Rini
parent 7afc4155a7
commit c8c0242f1c
1 changed files with 77 additions and 0 deletions
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77
drivers/rtc/m41t62.c
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@ -1,5 +1,8 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018
* Lukasz Majewski, DENX Software Engineering, lukma@denx.de.
*
* (C) Copyright 2008
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
@ -15,6 +18,7 @@
#include <common.h>
#include <command.h>
#include <dm.h>
#include <rtc.h>
#include <i2c.h>
@ -99,6 +103,78 @@ static void m41t62_set_rtc_buf(const struct rtc_time *tm, u8 *buf)
buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100);
}
#ifdef CONFIG_DM_RTC
static int m41t62_rtc_get(struct udevice *dev, struct rtc_time *tm)
{
u8 buf[M41T62_DATETIME_REG_SIZE];
int ret;
ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
if (ret)
return ret;
m41t62_update_rtc_time(tm, buf);
return 0;
}
static int m41t62_rtc_set(struct udevice *dev, const struct rtc_time *tm)
{
u8 buf[M41T62_DATETIME_REG_SIZE];
int ret;
ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
if (ret)
return ret;
m41t62_set_rtc_buf(tm, buf);
ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
if (ret) {
printf("I2C write failed in %s()\n", __func__);
return ret;
}
return 0;
}
static int m41t62_rtc_reset(struct udevice *dev)
{
u8 val;
/*
* M41T82: Make sure HT (Halt Update) bit is cleared.
* This bit is 0 in M41T62 so its save to clear it always.
*/
int ret = dm_i2c_read(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val));
val &= ~M41T80_ALHOUR_HT;
ret |= dm_i2c_write(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val));
return ret;
}
static const struct rtc_ops m41t62_rtc_ops = {
.get = m41t62_rtc_get,
.set = m41t62_rtc_set,
.reset = m41t62_rtc_reset,
};
static const struct udevice_id m41t62_rtc_ids[] = {
{ .compatible = "st,m41t62" },
{ .compatible = "microcrystal,rv4162" },
{ }
};
U_BOOT_DRIVER(rtc_m41t62) = {
.name = "rtc-m41t62",
.id = UCLASS_RTC,
.of_match = m41t62_rtc_ids,
.ops = &m41t62_rtc_ops,
};
#else /* NON DM RTC code - will be removed */
int rtc_get(struct rtc_time *tm)
{
u8 buf[M41T62_DATETIME_REG_SIZE];
@ -137,3 +213,4 @@ void rtc_reset(void)
val &= ~M41T80_ALHOUR_HT;
i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
}
#endif /* CONFIG_DM_RTC */