netdev - Re: [PATCH v2 1/4] dt-bindings: bluetooth: add new wcn3991 compatible to fix bd

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Date: Mon, 18 Mar 2024 15:00:40 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Johan Hedberg <johan.hedberg@...il.com>, Matthias Kaehlcke <mka@...omium.org>, 
	Doug Anderson <dianders@...gle.com>, Bjorn Andersson <quic_bjorande@...cinc.com>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, linux-bluetooth@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: bluetooth: add new wcn3991 compatible
 to fix bd_addr

On Mon, 18 Mar 2024 at 13:09, 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 says 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 bootloaders have been providing
> the address in big-endian order instead.
>
> The only device out there that should be affected by this is the WCN3991
> used in some Chromebooks. To maintain backwards compatibility, mark the
> current compatible string as deprecated and add a new
> 'qcom,wcn3991-bt-bdaddr-le' for firmware which conforms with the
> binding.
>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  .../net/bluetooth/qualcomm-bluetooth.yaml     | 29 +++++++++++--------
>  1 file changed, 17 insertions(+), 12 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml b/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml
> index eba2f3026ab0..b6fce6d02138 100644
> --- a/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml
> +++ b/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml
> @@ -15,18 +15,22 @@ description:
>
>  properties:
>    compatible:
> -    enum:
> -      - qcom,qca2066-bt
> -      - qcom,qca6174-bt
> -      - qcom,qca9377-bt
> -      - qcom,wcn3988-bt
> -      - qcom,wcn3990-bt
> -      - qcom,wcn3991-bt
> -      - qcom,wcn3998-bt
> -      - qcom,qca6390-bt
> -      - qcom,wcn6750-bt
> -      - qcom,wcn6855-bt
> -      - qcom,wcn7850-bt
> +    oneOf:
> +      - enum:
> +          - qcom,qca2066-bt
> +          - qcom,qca6174-bt
> +          - qcom,qca9377-bt
> +          - qcom,wcn3988-bt
> +          - qcom,wcn3990-bt
> +          - qcom,wcn3991-bt-bdaddr-le

This compatible doesn't describe new hardware kind. As such, I think,
the better way would be to continue using qcom,wcn3991-bt compatible
string + add some kind of qcom,bt-addr-le property.

> +          - qcom,wcn3998-bt
> +          - qcom,qca6390-bt
> +          - qcom,wcn6750-bt
> +          - qcom,wcn6855-bt
> +          - qcom,wcn7850-bt
> +      - enum:
> +          - qcom,wcn3991-bt
> +        deprecated: true
>
>    enable-gpios:
>      maxItems: 1
> @@ -122,6 +126,7 @@ allOf:
>                - qcom,wcn3988-bt
>                - qcom,wcn3990-bt
>                - qcom,wcn3991-bt
> +              - qcom,wcn3991-bt-bdaddr-le
>                - qcom,wcn3998-bt
>      then:
>        required:
> --
> 2.43.2
>
>


-- 
With best wishes
Dmitry