linux-kernel - Re: [PATCH mt76 v2 1/3] dt-bindings: net: wireless: mt76: Document power-limits country property

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Message-ID: <20251006204529.GA549972-robh@kernel.org>
Date: Mon, 6 Oct 2025 15:45:29 -0500
From: Rob Herring <robh@...nel.org>
To: "Sven Eckelmann (Plasma Cloud)" <se@...onwunderlich.de>
Cc: Felix Fietkau <nbd@....name>, Lorenzo Bianconi <lorenzo@...nel.org>,
	Ryder Lee <ryder.lee@...iatek.com>,
	Shayne Chen <shayne.chen@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Johannes Berg <johannes@...solutions.net>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	devicetree@...r.kernel.org
Subject: Re: [PATCH mt76 v2 1/3] dt-bindings: net: wireless: mt76: Document
 power-limits country property

On Fri, Sep 26, 2025 at 12:04:52PM +0200, Sven Eckelmann (Plasma Cloud) wrote:
> The commit 22b980badc0f ("mt76: add functions for parsing rate power limits
> from DT") added filtering of the power limits based on two properties:
> 
> * regdomain
> * country
> 
> If either the country or the regdomain matches, the power limits are
> applied and the search is aborted. If none of the two is defined for the
> power limit, it is a global (or "fallback") power limit. The last
> "fallback" power limit in the list will be returned when not matching
> regdomain or country was found.
> 
> The idea is here to allow to specify "overwriting" country limits in front
> of the list - just in case a regdomain is shared but a country has
> additional limitations.
> 
> But this property was forgotten to be defined in commit 2de6ccebe0e7
> ("dt-bindings:net:wireless:mediatek,mt76: introduce power-limits node").
> 
> Signed-off-by: Sven Eckelmann (Plasma Cloud) <se@...onwunderlich.de>
> ---
>  Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> index eabceb849537c418650697da86682ef04c979193..f8f72f3f1b1dd185b4797be38b87c621ef3eac08 100644
> --- a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> +++ b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> @@ -151,6 +151,11 @@ properties:
>                - ETSI
>                - JP
>  
> +          country:
> +            $ref: /schemas/types.yaml#/definitions/string
> +            description:
> +              ISO 3166-1 alpha-2 country code for power limits

This would be constrained to something like this?:

pattern: '^[A-Z]{2}$'

> +
>          patternProperties:
>            "^txpower-[256]g$":
>              type: object
> 
> -- 
> 2.47.3
>