rtc: pl031: set range

The PL031 and ST v1 RTC are 32bit seconds counters. STv2 is a BCD RTC
apparently going from 0000 to 9999, hopefully handling the leap days
properly until then.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200306005809.38530-2-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
index 2e8e019a6e4c28808a7247729b8fde0500b65e09..07dc0f264100a218f7bad9491a1a3fce3858d692 100644 (file)
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -80,6 +80,8 @@ struct pl031_vendor_data {
        bool clockwatch;
        bool st_weekday;
        unsigned long irqflags;
+       time64_t range_min;
+       timeu64_t range_max;
 };
 
 struct pl031_local {
@@ -375,6 +377,8 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
                return PTR_ERR(ldata->rtc);
 
        ldata->rtc->ops = ops;
+       ldata->rtc->range_min = vendor->range_min;
+       ldata->rtc->range_max = vendor->range_max;
 
        ret = rtc_register_device(ldata->rtc);
        if (ret)
@@ -405,6 +409,7 @@ static struct pl031_vendor_data arm_pl031 = {
                .set_alarm = pl031_set_alarm,
                .alarm_irq_enable = pl031_alarm_irq_enable,
        },
+       .range_max = U32_MAX,
 };
 
 /* The First ST derivative */
@@ -418,6 +423,7 @@ static struct pl031_vendor_data stv1_pl031 = {
        },
        .clockwatch = true,
        .st_weekday = true,
+       .range_max = U32_MAX,
 };
 
 /* And the second ST derivative */
@@ -438,6 +444,8 @@ static struct pl031_vendor_data stv2_pl031 = {
         * remove IRQF_COND_SUSPEND
         */
        .irqflags = IRQF_SHARED | IRQF_COND_SUSPEND,
+       .range_min = RTC_TIMESTAMP_BEGIN_0000,
+       .range_max = RTC_TIMESTAMP_END_9999,
 };
 
 static const struct amba_id pl031_ids[] = {