[PATCH v3 0/2] Kontron i.MX8MP OSM Devicetree Fixups

[PATCH v3 0/2] Kontron i.MX8MP OSM Devicetree Fixups

[Frieder Schrempf]

From: Frieder Schrempf <frieder.schrempf@kontron.de>

This contains three fixes and one cosmetic change for
the Kontron i.MX8MP OSM devices.

Changes for v3:
* Drop applied patches
* Add missing bindings patch for RV3028 RTC

Changes for v2:
* Add Frank's R-b tags (thanks)
* Enhance commit message of patch 2

Annette Kobou (1):
  arm64: dts: imx8mp-kontron: Fix boot order for PMIC and RTC

Frieder Schrempf (1):
  dt-bindings: rtc: microcrystal,rv3028: Allow to specify vdd-supply

 .../devicetree/bindings/rtc/microcrystal,rv3028.yaml        | 2 ++
 arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi     | 6 ++++++
 2 files changed, 8 insertions(+)

-- 
2.53.0

[PATCH v3 1/2] dt-bindings: rtc: microcrystal,rv3028: Allow to specify vdd-supply

[Frieder Schrempf]

From: Frieder Schrempf <frieder.schrempf@kontron.de>

In case the VDD supply voltage regulator of the RTC needs to be
specified explicitly, allow to set vdd-supply.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
 Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml b/Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml
index cda8ad7c12037..2ea3b40419530 100644
--- a/Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml
+++ b/Documentation/devicetree/bindings/rtc/microcrystal,rv3028.yaml
@@ -32,6 +32,8 @@ properties:
       - 9000
       - 15000
 
+  vdd-supply: true
+
 required:
   - compatible
   - reg
-- 
2.53.0

[PATCH v3 2/2] arm64: dts: imx8mp-kontron: Fix boot order for PMIC and RTC

[Frieder Schrempf]

From: Annette Kobou <annette.kobou@kontron.de>

The PMIC provides a level-shifter for the I2C lines to the RTC.
As the level shifter needs to be enabled before the RTC can be
accessed, we need to make sure that the PMIC driver is probed
first.

As the PMIC also provides the supply voltage for the RTC through
the 3.3V regulator, we can simply express this in the DT to
create the required dependency.

This fixes sporadic boot hangs that occurred when the RTC was
accessed before the level-shifter was enabled.

Fixes: 946ab10e3f40f ("arm64: dts: Add support for Kontron OSM-S i.MX8MP SoM and BL carrier board")
Signed-off-by: Annette Kobou <annette.kobou@kontron.de>
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
 arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi
index b97bfeb1c30f8..bc1a261bb000e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi
@@ -330,6 +330,12 @@ rv3028: rtc@52 {
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_rtc>;
 		interrupts-extended = <&gpio3 24 IRQ_TYPE_LEVEL_LOW>;
+		/*
+		 * While specifying the vdd-supply is normally not strictly necessary,
+		 * here it also makes sure that the PMIC driver enables the level-
+		 * shifter for the RTC before the RTC is probed.
+		 */
+		vdd-supply = <&reg_vdd_3v3>;
 	};
 };
 
-- 
2.53.0

Re: [PATCH v3 0/2] Kontron i.MX8MP OSM Devicetree Fixups

[Frank Li]

On Mon, Mar 09, 2026 at 09:57:41AM +0100, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
>
> This contains three fixes and one cosmetic change for
> the Kontron i.MX8MP OSM devices.
>
> Changes for v3:
> * Drop applied patches
> * Add missing bindings patch for RV3028 RTC
>
> Changes for v2:
> * Add Frank's R-b tags (thanks)
> * Enhance commit message of patch 2
>
> Annette Kobou (1):
>   arm64: dts: imx8mp-kontron: Fix boot order for PMIC and RTC
>
> Frieder Schrempf (1):
>   dt-bindings: rtc: microcrystal,rv3028: Allow to specify vdd-supply

Please include this patch in imx@lists.linux.dev next time. I will not
track this patches status. If it Acked or applied, let me know.

Frank

>
>  .../devicetree/bindings/rtc/microcrystal,rv3028.yaml        | 2 ++
>  arch/arm64/boot/dts/freescale/imx8mp-kontron-osm-s.dtsi     | 6 ++++++
>  2 files changed, 8 insertions(+)
>
> --
> 2.53.0
>

Re: [PATCH v3 1/2] dt-bindings: rtc: microcrystal,rv3028: Allow to specify vdd-supply

[Krzysztof Kozlowski]

On 09/03/2026 09:57, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
> 
> In case the VDD supply voltage regulator of the RTC needs to be
> specified explicitly, allow to set vdd-supply.
> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> ---

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

Re: (subset) [PATCH v3 0/2] Kontron i.MX8MP OSM Devicetree Fixups

[Alexandre Belloni]

On Mon, 09 Mar 2026 09:57:41 +0100, Frieder Schrempf wrote:
> Kontron i.MX8MP OSM Devicetree Fixups
> 
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
> 
> This contains three fixes and one cosmetic change for
> the Kontron i.MX8MP OSM devices.
> 
> [...]

Applied, thanks!

[1/2] dt-bindings: rtc: microcrystal,rv3028: Allow to specify vdd-supply
      https://git.kernel.org/abelloni/c/10663044bee5

Best regards,

Re: (subset) [PATCH v3 0/2] Kontron i.MX8MP OSM Devicetree Fixups

[Frank Li]

On Mon, 09 Mar 2026 09:57:41 +0100, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
>
> This contains three fixes and one cosmetic change for
> the Kontron i.MX8MP OSM devices.
>
> Changes for v3:
> * Drop applied patches
> * Add missing bindings patch for RV3028 RTC
>
> [...]

Applied, thanks!

[2/2] arm64: dts: imx8mp-kontron: Fix boot order for PMIC and RTC
      commit: 0f02852af55591d6a8609347890cc348f86fdac9

Update commit messsage, adjust wrap at 75 char. Change "this fixes" to
avoid.  Remove "We can ..."

Best regards,
--
Frank Li <Frank.Li@nxp.com>