linux-kernel - Re: [PATCH 1/9] dt-bindings: watchdog: samsung-wdt: deprecate samsung,syscon-phandle

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Date: Tue, 23 Jan 2024 12:09:44 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Peter Griffin <peter.griffin@...aro.org>, arnd@...db.de,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, linux@...ck-us.net,
 wim@...ux-watchdog.org, conor+dt@...nel.org, alim.akhtar@...sung.com,
 jaewon02.kim@...sung.com, chanho61.park@...sung.com,
 semen.protsenko@...aro.org
Cc: kernel-team@...roid.com, tudor.ambarus@...aro.org,
 andre.draszik@...aro.org, saravanak@...gle.com, willmcvicker@...gle.com,
 linux-fsd@...la.com, linux-watchdog@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 1/9] dt-bindings: watchdog: samsung-wdt: deprecate
 samsung,syscon-phandle

On 22/01/2024 23:57, Peter Griffin wrote:
> The watchdog driver no longer requires a phandle to obtain a regmap
> to the PMU registers. So mark this as deprecated.
> 
> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
> ---
>  .../devicetree/bindings/watchdog/samsung-wdt.yaml | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml b/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
> index 77a5ddd0426e..3970d6bf8576 100644
> --- a/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
> @@ -56,6 +56,7 @@ properties:
>      description:
>        Phandle to the PMU system controller node (in case of Exynos5250,
>        Exynos5420, Exynos7, Exynos850 and gs101).
> +    deprecated: true

I don't see how your driver handles probe or suspend ordering, so I
don't think this is correct approach.

Handling of the watchdog requires poking PMU, thus the watchdog device
node must have reference to the PMU node. Removing it from DTS makes the
hardware representation incomplete, beside mentioned driver issue.

Best regards,
Krzysztof