[PATCH v3 0/4] rtc: rzn1: cleanups, R-Car X5H enablement

[PATCH v3 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 v2:
* X5H is not compatible with the generic Gen5 family. So, only support
  X5H for now and add the Gen5 family later once HW is available
* added tags

Thanks for all the reviews of v2!

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                        | 53 ++++++++++++-------
 2 files changed, 57 insertions(+), 26 deletions(-)

-- 
2.53.0

[PATCH v3 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>
---

Change since v2:
* added tag

 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

[PATCH v3 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>
---

Change since v2:
* added tag

 .../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

[PATCH v3 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>
---

Change since v2:
* handle only X5H for now and do not fall back to generic Gen5

 .../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 v3 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/20260917111349.52250-1-wsa+renesas@sang-engineering.com?part=2

Re: [PATCH v3 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/20260917111349.52250-1-wsa+renesas@sang-engineering.com?part=1

Re: [PATCH v3 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/20260917111349.52250-1-wsa+renesas@sang-engineering.com?part=3

Re: [PATCH v3 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Geert Uytterhoeven]

On Thu, 17 Sept 2026 at 13:14, 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>
> ---
>
> Change since v2:
> * handle only X5H for now and do not fall back to generic Gen5

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

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v3 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Rob Herring (Arm)]

On Thu, 17 Sep 2026 13:13:47 +0200, Wolfram Sang 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>
> ---
> 
> Change since v2:
> * handle only X5H for now and do not fall back to generic Gen5
> 
>  .../bindings/rtc/renesas,rzn1-rtc.yaml        | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

Re: [PATCH v3 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Geert Uytterhoeven]

Hi Wolfram,

On Thu, 17 Sept 2026 at 13:14, 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>

> --- 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
> +

Sorry for missing this before: the "resets" property is
completely missing.

>  unevaluatedProperties: false
>
>  examples:

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v3 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 309 bytes --]


> > +      required:
> > +        - interrupts
> > +        - interrupt-names
> > +
> 
> Sorry for missing this before: the "resets" property is
> completely missing.

Yes. Prabhakar, looking at the N2H and T2H DTSI files, I assume that
those also have resets for the RTC and only N1D has none?


[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

Re: [PATCH v3 3/4] dt-bindings: rtc: rzn1: add R-Car X5H support

[Geert Uytterhoeven]

Hi Wolfram,

On Sun, 27 Sept 2026 at 18:14, Wolfram Sang
<wsa+renesas@sang-engineering.com> wrote:
> > > +      required:
> > > +        - interrupts
> > > +        - interrupt-names
> > > +
> >
> > Sorry for missing this before: the "resets" property is
> > completely missing.
>
> Yes. Prabhakar, looking at the N2H and T2H DTSI files, I assume that
> those also have resets for the RTC and only N1D has none?

RTC on RZ/T2H and RZ/N2H does not have a reset.
Please check the MRCTLx registers.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds