[PATCH 0/2] rtc: pcf85063: Add NXP PCA85074A support

[PATCH 0/2] rtc: pcf85063: Add NXP PCA85074A support

[Rodrigo Rea]

From: Rodrigo Rea <rodrigo.rea@nxp.com>

Add support for the NXP PCA85074A real-time clock.

The PCA85074A uses the same register map as the PCA85073A and can
reuse the existing PCF85063A configuration. The series documents the
new compatible and adds the corresponding I2C and OF match entries.
No changes to the timekeeping or alarm implementation are needed.

Tested on i.MX91S and i.MX93 platforms.

Host-side validation:
- scripts/checkpatch.pl --strict
- git diff --check
- Driver object build with W=1, I2C, OF and COMMON_CLK enabled
- dt_binding_check for rtc/nxp,pcf85063.yaml
- Patch application against the base revision

Datasheet: https://www.nxp.com/docs/en/data-sheet/PCA85074A.pdf

Rodrigo Rea (2):
  dt-bindings: rtc: pcf85063: Add NXP PCA85074A
  rtc: pcf85063: Add support for NXP PCA85074A

 Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml | 1 +
 drivers/rtc/rtc-pcf85063.c                              | 2 ++
 2 files changed, 3 insertions(+)


base-commit: 05441d697f7f9a927264f4058cbbc6a03dfcac9d
-- 
2.56.0

[PATCH 1/2] dt-bindings: rtc: pcf85063: Add NXP PCA85074A

[Rodrigo Rea]

From: Rodrigo Rea <rodrigo.rea@nxp.com>

Document the NXP PCA85074A real-time clock compatible.

Signed-off-by: Rodrigo Rea <rodrigo.rea@nxp.com>
---
 Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml
index f7013cd8f..b06ad3e0c 100644
--- a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml
+++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml
@@ -18,6 +18,7 @@ properties:
       - nxp,pcf85063a
       - nxp,pcf85063tp
       - nxp,pca85073a
+      - nxp,pca85074a
 
   reg:
     maxItems: 1
-- 
2.56.0

Re: [PATCH 1/2] dt-bindings: rtc: pcf85063: Add NXP PCA85074A

[Conor Dooley]

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On Thu, Nov 05, 2026 at 09:53:07PM +0000, Rodrigo Rea wrote:
> From: Rodrigo Rea <rodrigo.rea@nxp.com>
> 
> Document the NXP PCA85074A real-time clock compatible.

Driver change suggests a fallback compatible can be used. Why haven't
you used one?

Thanks,
Conor.

> 
> Signed-off-by: Rodrigo Rea <rodrigo.rea@nxp.com>
> ---
>  Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml
> index f7013cd8f..b06ad3e0c 100644
> --- a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml
> +++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.yaml
> @@ -18,6 +18,7 @@ properties:
>        - nxp,pcf85063a
>        - nxp,pcf85063tp
>        - nxp,pca85073a
> +      - nxp,pca85074a
>  
>    reg:
>      maxItems: 1
> -- 
> 2.56.0
> 

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Re: [PATCH 1/2] dt-bindings: rtc: pcf85063: Add NXP PCA85074A

[Rodrigo Rea]

Hi Conor,

> Driver change suggests a fallback compatible can be used. Why haven't
> you used one?

I overlooked the fallback approach when adding the new compatible.
I added explicit driver match entries, but they reuse the existing
configuration without any chip-specific changes.

Thanks for pointing this out. I'll verify the compatibility with
PCA85073A and update the binding to use a fallback in v2 if confirmed.

Regards,
Rodrigo

[PATCH 2/2] rtc: pcf85063: Add support for NXP PCA85074A

[Rodrigo Rea]

From: Rodrigo Rea <rodrigo.rea@nxp.com>

The PCA85074A uses the same register map as the PCA85073A, which
already uses the PCF85063A configuration. Add I2C and OF match entries
that reuse config_pcf85063a for the PCA85074A as well.

Tested on i.MX91S and i.MX93 platforms.

Link: https://www.nxp.com/docs/en/data-sheet/PCA85074A.pdf

Signed-off-by: Rodrigo Rea <rodrigo.rea@nxp.com>
---
 drivers/rtc/rtc-pcf85063.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index 32952e73f..64f106e92 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -763,6 +763,7 @@ static const struct pcf85063_config config_rv8263 = {
 
 static const struct i2c_device_id pcf85063_ids[] = {
 	{ .name = "pca85073a", .driver_data = (kernel_ulong_t)&config_pcf85063a },
+	{ .name = "pca85074a", .driver_data = (kernel_ulong_t)&config_pcf85063a },
 	{ .name = "pcf85063", .driver_data = (kernel_ulong_t)&config_pcf85063 },
 	{ .name = "pcf85063tp", .driver_data = (kernel_ulong_t)&config_pcf85063tp },
 	{ .name = "pcf85063a", .driver_data = (kernel_ulong_t)&config_pcf85063a },
@@ -774,6 +775,7 @@ MODULE_DEVICE_TABLE(i2c, pcf85063_ids);
 #ifdef CONFIG_OF
 static const struct of_device_id pcf85063_of_match[] = {
 	{ .compatible = "nxp,pca85073a", .data = &config_pcf85063a },
+	{ .compatible = "nxp,pca85074a", .data = &config_pcf85063a },
 	{ .compatible = "nxp,pcf85063", .data = &config_pcf85063 },
 	{ .compatible = "nxp,pcf85063tp", .data = &config_pcf85063tp },
 	{ .compatible = "nxp,pcf85063a", .data = &config_pcf85063a },
-- 
2.56.0