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rtc: rv3028: add support to manage VDD regulator

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This commit adds support to manage an external regulator to enable the main
power supply VDD.

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>
This commit is contained in:
Arturo Buzarra 2024-09-23 10:25:18 +02:00 • committed by Tom Rini
parent f27e830629
commit 718c225cbc
1 changed files with 32 additions and 0 deletions
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32
drivers/rtc/rv3028.c
View file

@ -12,6 +12,9 @@
#include <dm.h>
#include <i2c.h>
#include <rtc.h>
#include <dm/device_compat.h>
#include <linux/delay.h>
#include <power/regulator.h>
#define RV3028_SEC 0x00
#define RV3028_MIN 0x01
@ -78,6 +81,12 @@
#define RTC_RV3028_LEN 7
#define VDD_START_TIME_US 200000
struct rv3028_priv {
struct udevice *vdd;
};
static int rv3028_rtc_get(struct udevice *dev, struct rtc_time *tm)
{
u8 regs[RTC_RV3028_LEN];
@ -180,6 +189,28 @@ static int rv3028_rtc_write8(struct udevice *dev, unsigned int reg, int val)
static int rv3028_probe(struct udevice *dev)
{
struct rv3028_priv *priv = dev_get_priv(dev);
int ret;
if (IS_ENABLED(CONFIG_DM_REGULATOR)) {
ret = device_get_supply_regulator(dev, "vdd-supply", &priv->vdd);
if (ret && ret != -ENOENT) {
dev_err(dev, "Warning: cannot get VDD supply\n");
return ret;
}
if (priv->vdd) {
ret = regulator_set_enable_if_allowed(priv->vdd, true);
if (ret) {
dev_err(dev, "failed to enable vdd-supply\n");
return ret;
}
/* We must wait Tstart = 0.2s before access to I2C */
udelay(VDD_START_TIME_US);
}
}
i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
DM_I2C_CHIP_WR_ADDRESS);
@ -205,4 +236,5 @@ U_BOOT_DRIVER(rtc_rv3028) = {
.probe = rv3028_probe,
.of_match = rv3028_rtc_ids,
.ops = &rv3028_rtc_ops,
.priv_auto = sizeof(struct rv3028_priv),
};