linux-kernel - Re: [PATCH 4/4] dt-bindings: net: bluetooth: update broadcom-bluetooth

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Message-Id: <4AE3BBFC-DE79-478F-A9EE-A2243C30FA6E@holtmann.org>
Date:   Thu, 7 Nov 2019 15:09:48 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Ondrej Jirman <megous@...ous.com>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>
Subject: Re: [PATCH 4/4] dt-bindings: net: bluetooth: update
 broadcom-bluetooth

Hi Abhishek,

> Add documentation for pcm-parameters.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> 
> ---
> 
> Documentation/devicetree/bindings/net/broadcom-bluetooth.txt | 4 ++++
> 1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt b/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
> index c749dc297624..ae60277b5569 100644
> --- a/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
> +++ b/Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
> @@ -29,6 +29,9 @@ Optional properties:
>    - "lpo": external low power 32.768 kHz clock
>  - vbat-supply: phandle to regulator supply for VBAT
>  - vddio-supply: phandle to regulator supply for VDDIO
> + - pcm-parameters: When set, will configure PCM parameters on the device. The
> +   contents should be a 10-byte array corresponding to the pcm params (see
> +   btbcm.h for more information).
> 
> 
> Example:
> @@ -40,5 +43,6 @@ Example:
>        bluetooth {
>                compatible = "brcm,bcm43438-bt";
>                max-speed = <921600>;
> +               pcm-parameters = [1 2 0 1 1 0 0 0 0 0];
>        };
> };

I think about 1-2 years there have been a discussion on how to represent these values in a DT. I prefer we split these into separate values so it becomes usable by other drivers / vendors as well. In addition, maybe we start to focus on the values that differ from the default.

Regards

Marcel