[PATCH v4 4/4] rtc: rzn1: add R-Car X5H support
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: 2026-09-17 18:59:27
Also in:
linux-renesas-soc
Subsystem:
real time clock (rtc) subsystem, renesas rz/n1 rtc controller driver, the rest · Maintainers:
Alexandre Belloni, Miquel Raynal, Linus Torvalds
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