linux-kernel - Re: [PATCH v5 2/7] dt-bindings: wireless: ieee80211: Add disable-rfkill property

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Message-ID: <20251220-fervent-mamba-of-sunshine-f680a8@quoll>
Date: Sat, 20 Dec 2025 10:12:14 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Bryan O'Donoghue <bod.linux@...w.ie>
Cc: jerome.debretagne@...il.com, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Johannes Berg <johannes@...solutions.net>, Lorenzo Bianconi <lorenzo@...nel.org>, 
	Maximilian Luz <luzmaximilian@...il.com>, Hans de Goede <hansg@...nel.org>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, Jeff Johnson <jjohnson@...nel.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, platform-driver-x86@...r.kernel.org, ath12k@...ts.infradead.org, 
	Jeff Johnson <jeff.johnson@....qualcomm.com>, Dale Whinham <daleyo@...il.com>
Subject: Re: [PATCH v5 2/7] dt-bindings: wireless: ieee80211: Add
 disable-rfkill property

On Sat, Dec 20, 2025 at 06:04:00AM +0000, Bryan O'Donoghue wrote:
> On 20/12/2025 00:21, Jérôme de Bretagne via B4 Relay wrote:
> > From: Jérôme de Bretagne <jerome.debretagne@...il.com>
> > 
> > For some devices, Wi-Fi is entirely hard blocked by default making
> > the Wi-Fi radio unusable, except if rfkill is disabled as expected
> > on those models.
> > 
> > Commit c6a7c0b09d5f ("wifi: ath12k: Add Support for enabling or
> > disabling specific features based on ACPI bitflag") added a way to
> > support features set via ACPI, including the DISABLE_RFKILL bit.
> > 
> > Add a disable-rfkill property to expose the DISABLE_RFKILL bit
> > equivalent for devices described by a Devicetree instead of ACPI.
> > 
> > Signed-off-by: Jérôme de Bretagne <jerome.debretagne@...il.com>
> > ---
> >   Documentation/devicetree/bindings/net/wireless/ieee80211.yaml | 6 ++++++
> >   1 file changed, 6 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/wireless/ieee80211.yaml b/Documentation/devicetree/bindings/net/wireless/ieee80211.yaml
> > index d89f7a3f88a71d45d6f4ab2ae909eae09cbcaf9a..c10a4675640be947cd0b5eaec2c7ff367fd93945 100644
> > --- a/Documentation/devicetree/bindings/net/wireless/ieee80211.yaml
> > +++ b/Documentation/devicetree/bindings/net/wireless/ieee80211.yaml
> > @@ -29,6 +29,12 @@ properties:
> >         different 5 GHz subbands. Using them incorrectly could not work or
> >         decrease performance noticeably
> > 
> > +  disable-rfkill:
> > +    type: boolean
> > +    description:
> > +      Disable rfkill for some devices on which Wi-Fi would be entirely hard
> > +      blocked by default otherwise
> > +
> >   additionalProperties: true
> > 
> >   examples:
> > 
> > --
> > 2.47.3
> > 
> > 
> > 
> 
> Is this really a hardware description though ?
> 
> Its really more of a logical/functional description. It tells the runtime
> what todo, not what the hardware is.
> 
> You could also have a list of quirks in ath12k for this or have a user-space
> utility look for the appropriate platform device string name and disable
> rfkill.
> 
> I think this logic belongs in drivers/net/wireless/ath/ath12k/ triggering on
> a compat string.

This is good point. Either this could be deducible from the compatible
or this should actually describe the hardware and whatever is there
wired/configured, not what OS should do.

Best regards,
Krzysztof