Re: [PATCH v4 1/4] dt-bindings: rtc: add schema for NXP S32G2/S32G3 SoCs

[Conor Dooley <conor@kernel.org>]

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On Mon, Nov 11, 2024 at 03:59:37PM +0200, Ciprian Costea wrote:
> From: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
> 
> RTC tracks clock time during system suspend and it is used as a wakeup
> source on S32G2/S32G3 architecture.
> 
> RTC from S32G2/S32G3 is not battery-powered and it is not kept alive
> during system reset.
> 
> Co-developed-by: Bogdan-Gabriel Roman <bogdan-gabriel.roman@nxp.com>
> Signed-off-by: Bogdan-Gabriel Roman <bogdan-gabriel.roman@nxp.com>
> Co-developed-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
> Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
> Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
> ---
>  .../devicetree/bindings/rtc/nxp,s32g-rtc.yaml | 78 +++++++++++++++++++
>  1 file changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/rtc/nxp,s32g-rtc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/rtc/nxp,s32g-rtc.yaml b/Documentation/devicetree/bindings/rtc/nxp,s32g-rtc.yaml
> new file mode 100644
> index 000000000000..231811579e1b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/nxp,s32g-rtc.yaml
> @@ -0,0 +1,78 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/rtc/nxp,s32g-rtc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP S32G2/S32G3 Real Time Clock (RTC)
> +
> +maintainers:
> +  - Bogdan Hamciuc <bogdan.hamciuc@nxp.com>
> +  - Ciprian Marian Costea <ciprianmarian.costea@nxp.com>
> +
> +description:
> +  RTC hardware module present on S32G2/S32G3 SoCs is used as a wakeup
> +  source. It is not kept alive during system reset and it is not
> +  battery-powered.
> +
> +  RTC hardware module contains a hardware mux with 4 entries/inputs
> +  for clock source selection. On S32G2/S32G3 SoCs, this mux is used
> +  to select between a clock source for runtime which brings more
> +  precision but is not available during system standby, and a clock
> +  source for suspend state.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - nxp,s32g2-rtc
> +      - items:
> +          - const: nxp,s32g3-rtc
> +          - const: nxp,s32g2-rtc
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 2
> +    items:
> +      - description: ipg clock drives the access to the
> +          RTC iomapped registers
> +      - description: Runtime clock source. It must be a clock
> +          source for the RTC module. It will be disabled by hardware
> +          during Standby/Suspend.
> +      - description: Standby/Suspend clock source. It is optional
> +          and can be used in case the RTC will continue ticking during
> +          platform/system suspend.
> +
> +  clock-names:
> +    minItems: 2
> +    maxItems: 3

You actually have to provide the clock-names, otherwise you can't rely
on them

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