[PATCH v4 1/4] dt-bindings: rtc: add schema for NXP S32G2/S32G3 SoCs
Conor Dooley
conor at kernel.org
Mon Nov 11 12:05:50 PST 2024
On Mon, Nov 11, 2024 at 03:59:37PM +0200, Ciprian Costea wrote:
> From: Ciprian Marian Costea <ciprianmarian.costea at 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 at nxp.com>
> Signed-off-by: Bogdan-Gabriel Roman <bogdan-gabriel.roman at nxp.com>
> Co-developed-by: Ghennadi Procopciuc <ghennadi.procopciuc at nxp.com>
> Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc at nxp.com>
> Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea at 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 at nxp.com>
> + - Ciprian Marian Costea <ciprianmarian.costea at 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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