linux-kernel - Re: [PATCH v2 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF

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Message-ID: <8d52eaa7-0934-97fd-0288-9e8ed2f82bee@linaro.org>
Date:   Tue, 11 Jul 2023 11:23:40 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     huaqian.li@...mens.com, wim@...ux-watchdog.org, linux@...ck-us.net,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org
Cc:     huaqianlee@...il.com, nm@...com, vigneshr@...com,
        kristo@...nel.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jan.kiszka@...mens.com,
        baocheng.su@...mens.com
Subject: Re: [PATCH v2 1/3] dt-bindings: watchdog: ti,rti-wdt: Add support for
 WDIOF_CARDRESET

On 11/07/2023 11:17, huaqian.li@...mens.com wrote:
> From: Li Hua Qian <huaqian.li@...mens.com>
> 
> TI RTI (Real Time Interrupt) Watchdog doesn't support to record the
> watchdog cause. Add a reserved memory to know the last reboot was caused
> by the watchdog card. In the reserved memory, some specific info will be
> saved to indicate whether the watchdog reset was triggered in last
> boot.
> 
> Signed-off-by: Li Hua Qian <huaqian.li@...mens.com>
> ---

Missing changelog.

>  .../devicetree/bindings/watchdog/ti,rti-wdt.yaml    | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
> index fc553211e42d..f227db08dc70 100644
> --- a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
> @@ -26,7 +26,18 @@ properties:
>        - ti,j7-rti-wdt
>  
>    reg:
> -    maxItems: 1
> +    maxItems: 2

The expected syntax is in such case:
  items:
    - description: ...
    - description: ...

You will find plenty of examples for this.

> +      description:
> +	- Contains the address and the size of MCU RTI register.
> +	- Contains the address and the size of reserved memory, which

I don't think Conor suggested using reg of the device, but reg of
reserved memory. This is not device address space, but just some random
memory.

memory-region seems proper to me. We were just discussing totally
useless new property of size.

What's more - you did not test it... so usual template:

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

Best regards,
Krzysztof