linux-kernel - Re: [PATCH v2 1/2] dt-bindings: timer: Add Realtek SYSTIMER binding

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Message-ID: <0d5d53a4-484e-4b08-8997-b90ccceecc26@kernel.org>
Date: Fri, 14 Nov 2025 10:11:32 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Hao-Wen Ting <haowen.ting@...ltek.com>, daniel.lezcano@...aro.org,
 tglx@...utronix.de
Cc: jinn.cheng@...ltek.com, edwardwu@...ltek.com, phelic@...ltek.com,
 shawn.huang724@...ltek.com, cy.huang@...ltek.com, james.tai@...ltek.com,
 cylee12@...ltek.com, phinex@...ltek.com, conor+dt@...nel.org,
 krzk+dt@...nel.org, robh@...nel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, stanley_chang@...ltek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: timer: Add Realtek SYSTIMER binding

On 14/11/2025 10:04, Hao-Wen Ting wrote:
> Add device tree binding documentation for the Realtek SYSTIMER, a 64-bit
> timer that can be used as a tick broadcast timer on multi-core Realtek
> SoCs.
> 
> The SYSTIMER remains active during deep CPU idle states where local
> timers are powered off, allowing all CPUs to enter power-cut idle states
> simultaneously for improved power efficiency. The timer operates at a
> fixed 1MHz frequency and supports oneshot mode for tick broadcast
> functionality.
> 
> Signed-off-by: Hao-Wen Ting <haowen.ting@...ltek.com>
> ---
>  .../bindings/timer/realtek,systimer.yaml      | 48 +++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/timer/realtek,systimer.yaml
> 
> diff --git a/Documentation/devicetree/bindings/timer/realtek,systimer.yaml b/Documentation/devicetree/bindings/timer/realtek,systimer.yaml
> new file mode 100644
> index 000000000000..8e68158c68f8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/realtek,systimer.yaml

Filename matching compatible, see writing bindings doc. I already asked
to read that doc.

A nit, subject: drop second/last, redundant "binding". The "dt-bindings"
prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18


> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/realtek,systimer.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Realtek System Timer
> +
> +maintainers:
> +  - Hao-Wen Ting <haowen.ting@...ltek.com>
> +
> +description: |
> +  The Realtek SYSTIMER (System Timer) is a 64-bit timer that can be used as
> +  a tick broadcast timer on multi-core Realtek SoCs. It remains active during
> +  deep CPU idle states where local timers are powered off, allowing all CPUs
> +  to enter power-cut idle states simultaneously for better power efficiency.
> +
> +  The timer operates at a fixed 1MHz frequency and supports oneshot mode
> +  for tick broadcast functionality.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - realtek,rtd1625-systimer
> +      - realtek,rtd1635-systimer

You don't use this compatible which raises questions, maybe you wanted
to express compatibility.


Best regards,
Krzysztof