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SubjectRe: [PATCH v4 04/14] dt-bindings: rtc: add bindings for microchip mpfs rtc
On Mon, Jan 17, 2022 at 11:07:45AM +0000, conor.dooley@microchip.com wrote:
> From: Conor Dooley <conor.dooley@microchip.com>
>
> Add device tree bindings for the real time clock on
> the Microchip PolarFire SoC.
>
> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---
> .../bindings/rtc/microchip,mfps-rtc.yaml | 63 +++++++++++++++++++
> 1 file changed, 63 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml
>
> diff --git a/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml b/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml
> new file mode 100644
> index 000000000000..d57460cbe5e3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/microchip,mfps-rtc.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/rtc/microchip,mfps-rtc.yaml#
> +
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PolarFire Soc (MPFS) RTC Device Tree Bindings
> +
> +allOf:
> + - $ref: rtc.yaml#
> +
> +maintainers:
> + - Daire McNamara <daire.mcnamara@microchip.com>
> + - Lewis Hanly <lewis.hanly@microchip.com>
> +
> +properties:
> + compatible:
> + enum:
> + - microchip,mpfs-rtc
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 2
Need to define what each one is.

> +
> + microchip,prescaler:
> + description: |
> + The prescaler divides the input frequency to create a time-based strobe (typically 1 Hz) for
> + the calendar counter. The Alarm and Compare Registers, in conjunction with the calendar
> + counter, facilitate time-matched events. To properly operate in Calendar or Binary mode,
> + the 26-bit prescaler must be programmed to generate a strobe to the RTC.
> + maxItems: 1
> + $ref: /schemas/types.yaml#/definitions/uint32

Can't you calculate this based on the clock input freq?

> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + items:
> + - const: rtc
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - clocks
> + - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/microchip,mpfs-clock.h>
> + rtc@20124000 {
> + compatible = "microchip,mpfs-rtc";
> + reg = <0x20124000 0x1000>;
> + clocks = <&clkcfg CLK_RTC>;
> + clock-names = "rtc";
> + interrupts = <80>, <81>;
> + };
> +...
> --
> 2.32.0
>
>

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