[PATCH v4 4/4] rtc: rzn1: add R-Car X5H support

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

The RTC on R-Car X5H is a bit special because interrupts are not wired.
Future R-Car Gen5 SoCs will have them wired again. So, create a
dedicated entry for X5H without interrupts.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---

Changes since v3:

* clear RTC_FEATURE_UPDATE_INTERRUPT when no irqs
* add tag

 drivers/rtc/rtc-rzn1.c | 52 ++++++++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 17 deletions(-)

diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c
index b9d69ebdd224..1db518ab3a3a 100644
--- a/drivers/rtc/rtc-rzn1.c
+++ b/drivers/rtc/rtc-rzn1.c
@@ -68,6 +68,7 @@
 
 struct rzn1_rtc_data {
 	bool has_subu;
+	bool broken_irqs;
 };
 
 struct rzn1_rtc {
@@ -396,6 +397,11 @@ static const struct rtc_class_ops rzn1_rtc_ops_scmp = {
 	.alarm_irq_enable = rzn1_rtc_alarm_irq_enable,
 };
 
+static const struct rtc_class_ops rzn1_rtc_ops_scmp_no_alarm = {
+	.read_time = rzn1_rtc_read_time,
+	.set_time = rzn1_rtc_set_time,
+};
+
 static void rzn1_rtc_disable_hardware(void *data)
 {
 	struct device *dev = data;
@@ -431,10 +437,6 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(rtc->base))
 		return dev_err_probe(dev, PTR_ERR(rtc->base), "Missing reg\n");
 
-	irq = platform_get_irq_byname(pdev, "alarm");
-	if (irq < 0)
-		return irq;
-
 	rtc->rtcdev = devm_rtc_allocate_device(dev);
 	if (IS_ERR(rtc->rtcdev))
 		return PTR_ERR(rtc->rtcdev);
@@ -503,25 +505,40 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
 
 	spin_lock_init(&rtc->ctl1_access_lock);
 
-	ret = devm_request_irq(dev, irq, rzn1_rtc_alarm_irq, 0, "RZN1 RTC Alarm", rtc);
-	if (ret)
-		return dev_err_probe(dev, ret, "RTC alarm interrupt not available\n");
-
-	irq = platform_get_irq_byname_optional(pdev, "pps");
-	if (irq == -EPROBE_DEFER)
-		return irq;
-	if (irq >= 0)
-		ret = devm_request_irq(dev, irq, rzn1_rtc_1s_irq, 0, "RZN1 RTC 1s", rtc);
-
-	if (irq < 0 || ret) {
-		set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtcdev->features);
+	if (data->broken_irqs) {
+		/* All known broken irqs are on SCMP only variants */
+		rtc->rtcdev->ops = &rzn1_rtc_ops_scmp_no_alarm;
 		clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtcdev->features);
-		dev_warn(dev, "RTC pps interrupt not available. Alarm has only minute accuracy\n");
+	} else {
+		irq = platform_get_irq_byname(pdev, "alarm");
+		if (irq < 0)
+			return irq;
+
+		ret = devm_request_irq(dev, irq, rzn1_rtc_alarm_irq, 0, "RZN1 RTC Alarm", rtc);
+		if (ret)
+			return dev_err_probe(dev, ret, "RTC alarm interrupt not available\n");
+
+		irq = platform_get_irq_byname_optional(pdev, "pps");
+		if (irq == -EPROBE_DEFER)
+			return irq;
+		if (irq >= 0)
+			ret = devm_request_irq(dev, irq, rzn1_rtc_1s_irq, 0, "RZN1 RTC 1s", rtc);
+
+		if (irq < 0 || ret) {
+			set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtcdev->features);
+			clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtcdev->features);
+			dev_warn(dev, "RTC pps interrupt not available. Alarm has only minute accuracy\n");
+		}
 	}
 
 	return devm_rtc_register_device(rtc->rtcdev);
 }
 
+static const struct rzn1_rtc_data rzn1_rtc_r8a78000_data = {
+	.has_subu = false,
+	.broken_irqs = true,
+};
+
 static const struct rzn1_rtc_data rzn1_rtc_rzt2h_data = {
 	.has_subu = false,
 };
@@ -531,6 +548,7 @@ static const struct rzn1_rtc_data rzn1_rtc_rzn1_data = {
 };
 
 static const struct of_device_id rzn1_rtc_of_match[] = {
+	{ .compatible	= "renesas,r8a78000-rtc", .data = &rzn1_rtc_r8a78000_data },
 	{ .compatible	= "renesas,r9a09g077-rtc", .data = &rzn1_rtc_rzt2h_data },
 	{ .compatible	= "renesas,rzn1-rtc", .data = &rzn1_rtc_rzn1_data },
 	{ /* sentinel */ }
-- 
2.53.0