linux-kernel - Re: [PATCH v3 5/5] arm64: dts: qcom: sc7180-trogdor: mark bluetooth address as broken

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Date: Tue, 19 Mar 2024 09:10:54 -0700
From: Doug Anderson <dianders@...omium.org>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	cros-qcom-dts-watchers@...omium.org, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Johan Hedberg <johan.hedberg@...il.com>, 
	Balakrishna Godavarthi <quic_bgodavar@...cinc.com>, Matthias Kaehlcke <mka@...omium.org>, 
	Rocky Liao <quic_rjliao@...cinc.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH v3 5/5] arm64: dts: qcom: sc7180-trogdor: mark bluetooth
 address as broken

Hi,

On Tue, Mar 19, 2024 at 8:29 AM Johan Hovold <johan+linaro@...nel.org> wrote:
>
> Several Qualcomm Bluetooth controllers lack persistent storage for the
> device address and instead one can be provided by the boot firmware
> using the 'local-bd-address' devicetree property.
>
> The Bluetooth bindings clearly states that the address should be
> specified in little-endian order, but due to a long-standing bug in the
> Qualcomm driver which reversed the address some boot firmware has been
> providing the address in big-endian order instead.
>
> The boot firmware in SC7180 Trogdor Chromebooks is known to be affected
> so mark the 'local-bd-address' property as broken to maintain backwards
> compatibility with older firmware when fixing the underlying driver bug.
>
> Note that ChromeOS always updates the kernel and devicetree in lockstep
> so that there is no need to handle backwards compatibility with older
> devicetrees.
>
> Fixes: 7ec3e67307f8 ("arm64: dts: qcom: sc7180-trogdor: add initial trogdor and lazor dt")
> Cc: stable@...r.kernel.org      # 5.10
> Cc: Rob Clark <robdclark@...omium.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 2 ++
>  1 file changed, 2 insertions(+)

Assuming DT bindings folks Ack the binding, this looks fine to me.

Reviewed-by: Douglas Anderson <dianders@...omium.org>