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rtc: rx8025: add support for EPSON RX8035.

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The RX8035 is a newer model from EPSON which is
very similar in operation to the RX8025.

The changes mirror similar ones that will be
in Linux 5.15:
https://lore.kernel.org/all/20210709044518.28769-2-matt@traverse.com.au/

The UBOOT_DRIVER ID has also been corrected, previously
it declared itself as rx8010sj_rtc which is a different driver.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
This commit is contained in:
Mathew McBride
2021-09-17 06:46:02 +00:00
committed by Tom Rini
parent 152ef916f8
commit 9ca4ae2d2a
1 changed files with 28 additions and 5 deletions
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33
drivers/rtc/rx8025.c
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@@ -24,6 +24,11 @@
#endif
/*---------------------------------------------------------------------*/
enum rx_model {
model_rx_8025,
model_rx_8035,
};
/*
* RTC register addresses
*/
@@ -64,6 +69,20 @@
static int rtc_write(struct udevice *dev, uchar reg, uchar val);
static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2)
{
int xstp = ctrl2 & RTC_CTL2_BIT_XST;
/* XSTP bit has different polarity on RX-8025 vs RX-8035.
* RX-8025: 0 == oscillator stopped
* RX-8035: 1 == oscillator stopped
*/
if (model == model_rx_8025)
xstp = !xstp;
return xstp;
}
/*
* Get the current time from the RTC
*/
@@ -101,8 +120,7 @@ static int rx8025_rtc_get(struct udevice *dev, struct rtc_time *tmp)
printf("RTC: voltage drop detected\n");
rel = -1;
}
if (!(ctl2 & RTC_CTL2_BIT_XST)) {
if (rx8025_is_osc_stopped(dev->driver_data, ctl2)) {
printf("RTC: oscillator stop detected\n");
rel = -1;
}
@@ -180,7 +198,11 @@ static int rx8025_rtc_reset(struct udevice *dev)
ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
if (dev->driver_data == model_rx_8035)
ctl2 &= ~(RTC_CTL2_BIT_XST);
else
ctl2 |= RTC_CTL2_BIT_XST;
return rtc_write(dev, RTC_CTL2_REG_ADDR, ctl2);
}
@@ -223,11 +245,12 @@ static const struct rtc_ops rx8025_rtc_ops = {
};
static const struct udevice_id rx8025_rtc_ids[] = {
{ .compatible = "epson,rx8025" },
{ .compatible = "epson,rx8025", .data = model_rx_8025 },
{ .compatible = "epson,rx8035", .data = model_rx_8035 },
{ }
};
U_BOOT_DRIVER(rx8010sj_rtc) = {
U_BOOT_DRIVER(rx8025_rtc) = {
.name = "rx8025_rtc",
.id = UCLASS_RTC,
.probe = rx8025_probe,