[PATCH v4 0/4] rtc: rzn1: cleanups, R-Car X5H enablement

[PATCH v4 0/4] rtc: rzn1: cleanups, R-Car X5H enablement

[Wolfram Sang]

This series adds RTC support for the Renesas R-Car X5H SoC.

Changes since v3:
* clear RTC_FEATURE_UPDATE_INTERRUPT when no irqs
* added tags

Thanks for all the reviews of v3!

These patches have been tested on the original RZ/N1D board and the new
X5H Ironhide board. 'rtctest' passed on both SoCs. On X5H, some tests
are skipped, of course, because no alarms are supported.

'dt_binding_check' and 'dtbs_check' did not find any issues, for both,
RZ/N1D and R-Car X5H. I also verified for both that it rightfully
complains when irqs are different from what is expected.

A branch can be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/x5h/rtc-experimental

Looking forward to comments.


Wolfram Sang (4):
  dt-bindings: rtc: rzn1: drop unneeded 'start-year' from example
  dt-bindings: rtc: rzn1: add SoC names next to their IDs
  dt-bindings: rtc: rzn1: add R-Car X5H support
  rtc: rzn1: add R-Car X5H support

 .../bindings/rtc/renesas,rzn1-rtc.yaml        | 30 ++++++++---
 drivers/rtc/rtc-rzn1.c                        | 52 +++++++++++++------
 2 files changed, 57 insertions(+), 25 deletions(-)

-- 
2.53.0

[PATCH v4 1/4] dt-bindings: rtc: rzn1: drop unneeded 'start-year' from example

[Wolfram Sang]

We don't use 'start-year' in upstream DTs because the driver does the
right thing by default, ranging from 2000 to 2099. So, drop it from the
example, too.

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

Changes since v3: none

 Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
index ea7b039a91e7..e96007981c34 100644
--- a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
@@ -91,5 +91,4 @@ examples:
         clocks = <&sysctrl R9A06G032_HCLK_RTC>;
         clock-names = "hclk";
         power-domains = <&sysctrl>;
-        start-year = <2000>;
     };
-- 
2.53.0

Re: [PATCH v4 1/4] dt-bindings: rtc: rzn1: drop unneeded 'start-year' from example

[sashiko-bot]

> We don't use 'start-year' in upstream DTs because the driver does the
> right thing by default, ranging from 2000 to 2099. So, drop it from the
> example, too.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260917185903.61253-6-wsa+renesas@sang-engineering.com?part=1

[PATCH v4 2/4] dt-bindings: rtc: rzn1: add SoC names next to their IDs

[Wolfram Sang]

This helps maintaining because the numbers are easy to confuse.

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

Changes since v3: none

 .../devicetree/bindings/rtc/renesas,rzn1-rtc.yaml      | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
index e96007981c34..7ea77cd0bee1 100644
--- a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
@@ -14,14 +14,14 @@ properties:
     oneOf:
       - items:
           - enum:
-              - renesas,r9a06g032-rtc
-          - const: renesas,rzn1-rtc
+              - renesas,r9a06g032-rtc # RZ/N1D
+          - const: renesas,rzn1-rtc   # RZ/N1
 
-      - const: renesas,r9a09g077-rtc
+      - const: renesas,r9a09g077-rtc  # RZ/T2H
 
       - items:
-          - const: renesas,r9a09g087-rtc
-          - const: renesas,r9a09g077-rtc
+          - const: renesas,r9a09g087-rtc  # RZ/N2H
+          - const: renesas,r9a09g077-rtc  # RZ/T2H
 
   reg:
     maxItems: 1
-- 
2.53.0

Re: [PATCH v4 2/4] dt-bindings: rtc: rzn1: add SoC names next to their IDs

[sashiko-bot]

> This helps maintaining because the numbers are easy to confuse.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260917185903.61253-6-wsa+renesas@sang-engineering.com?part=2

[PATCH v4 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Wolfram Sang]

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: Geert Uytterhoeven <geert+renesas@glider.be>
---

Changes since v3: tag added

 .../bindings/rtc/renesas,rzn1-rtc.yaml        | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
index 7ea77cd0bee1..b448725671ec 100644
--- a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
@@ -23,6 +23,8 @@ properties:
           - const: renesas,r9a09g087-rtc  # RZ/N2H
           - const: renesas,r9a09g077-rtc  # RZ/T2H
 
+      - const: renesas,r8a78000-rtc   # R-Car X5H
+
   reg:
     maxItems: 1
 
@@ -52,8 +54,6 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts
-  - interrupt-names
   - clocks
   - clock-names
   - power-domains
@@ -66,6 +66,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - renesas,r8a78000-rtc
               - renesas,r9a09g077-rtc
               - renesas,r9a09g087-rtc
     then:
@@ -75,6 +76,20 @@ allOf:
         clock-names:
           minItems: 2
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r8a78000-rtc
+    then:
+      properties:
+        interrupts: false
+        interrupt-names: false
+    else:
+      required:
+        - interrupts
+        - interrupt-names
+
 unevaluatedProperties: false
 
 examples:
-- 
2.53.0

Re: [PATCH v4 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[sashiko-bot]

> 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>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260917185903.61253-6-wsa+renesas@sang-engineering.com?part=3

Re: [PATCH v4 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Lad, Prabhakar]

On Thu, Sep 17, 2026 at 7:59 PM Wolfram Sang
<wsa+renesas@sang-engineering.com> wrote:
>
> 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: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
>
> Changes since v3: tag added
>
>  .../bindings/rtc/renesas,rzn1-rtc.yaml        | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Cheers,
Prabhakar

> diff --git a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
> index 7ea77cd0bee1..b448725671ec 100644
> --- a/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/renesas,rzn1-rtc.yaml
> @@ -23,6 +23,8 @@ properties:
>            - const: renesas,r9a09g087-rtc  # RZ/N2H
>            - const: renesas,r9a09g077-rtc  # RZ/T2H
>
> +      - const: renesas,r8a78000-rtc   # R-Car X5H
> +
>    reg:
>      maxItems: 1
>
> @@ -52,8 +54,6 @@ properties:
>  required:
>    - compatible
>    - reg
> -  - interrupts
> -  - interrupt-names
>    - clocks
>    - clock-names
>    - power-domains
> @@ -66,6 +66,7 @@ allOf:
>          compatible:
>            contains:
>              enum:
> +              - renesas,r8a78000-rtc
>                - renesas,r9a09g077-rtc
>                - renesas,r9a09g087-rtc
>      then:
> @@ -75,6 +76,20 @@ allOf:
>          clock-names:
>            minItems: 2
>
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r8a78000-rtc
> +    then:
> +      properties:
> +        interrupts: false
> +        interrupt-names: false
> +    else:
> +      required:
> +        - interrupts
> +        - interrupt-names
> +
>  unevaluatedProperties: false
>
>  examples:
> --
> 2.53.0
>

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

[Wolfram Sang]

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

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

[sashiko-bot]

> 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>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260917185903.61253-6-wsa+renesas@sang-engineering.com?part=4

Re: [PATCH v4 0/4] rtc: rzn1: cleanups, R-Car X5H enablement

[Alexandre Belloni]

On Thu, 17 Sep 2026 20:59:03 +0200, Wolfram Sang wrote:
> This series adds RTC support for the Renesas R-Car X5H SoC.
> 
> Changes since v3:
> * clear RTC_FEATURE_UPDATE_INTERRUPT when no irqs
> * added tags
> 
> Thanks for all the reviews of v3!
> 
> [...]

Applied, thanks!

[1/4] dt-bindings: rtc: rzn1: drop unneeded 'start-year' from example
      https://git.kernel.org/abelloni/c/a867106d8a89
[2/4] dt-bindings: rtc: rzn1: add SoC names next to their IDs
      https://git.kernel.org/abelloni/c/73defdbfce62
[3/4] dt-bindings: rtc: rzn1: add R-Car X5H support
      https://git.kernel.org/abelloni/c/3b3fdc9fd40d
[4/4] rtc: rzn1: add R-Car X5H support
      https://git.kernel.org/abelloni/c/cba3b5f4cc00

Best regards,

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com