linux-kernel - Re: [PATCH v4 2/2] dt-bindings: net: bluetooth: Add device tree bindings for QTI chip WCN3998

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Date:   Mon, 25 Mar 2019 09:29:35 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Harish Bandi <c-hbandi@...eaurora.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        hemantg@...eaurora.org, linux-arm-msm@...r.kernel.org,
        bgodavar@...eaurora.org, anubhavg@...eaurora.org,
        devicetree@...r.kernel.org, mark.rutland@....com,
        robh+dt@...nel.org
Subject: Re: [PATCH v4 2/2] dt-bindings: net: bluetooth: Add device tree
 bindings for QTI chip WCN3998

On Mon, Mar 25, 2019 at 05:06:40PM +0530, Harish Bandi wrote:
> This patch enables regulators for the Qualcomm Bluetooth WCN3998
> controller.
> 
> Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
> ---
> Changes in V4:
> - Removed new compatible WCN3998
> - changed wcn3990 to wcn399* to represent wcn399* family
> ---
>  Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> index 824c0e2..de9cefa 100644
> --- a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> +++ b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> @@ -11,20 +11,21 @@ Required properties:
>   - compatible: should contain one of the following:
>     * "qcom,qca6174-bt"
>     * "qcom,wcn3990-bt"
> +   * "qcom,wcn3998-bt"
>  
>  Optional properties for compatible string qcom,qca6174-bt:
>  
>   - enable-gpios: gpio specifier used to enable chip
>   - clocks: clock provided to the controller (SUSCLK_32KHZ)
>  
> -Required properties for compatible string qcom,wcn3990-bt:
> +Required properties for compatible string qcom,wcn399*-bt:

I think in Linux drivers the use of 'x' is more common as a wildcard
for a single letter than an asterisk. It is also in line with the
function name in the driver, so I would suggest to keep thinkgs
consistent and call it wcn399x everywhere.

>  
>   - vddio-supply: VDD_IO supply regulator handle.
>   - vddxo-supply: VDD_XO supply regulator handle.
>   - vddrf-supply: VDD_RF supply regulator handle.
>   - vddch0-supply: VDD_CH0 supply regulator handle.
>  
> -Optional properties for compatible string qcom,wcn3990-bt:
> +Optional properties for compatible string qcom,wcn399*-bt:
>  
>   - max-speed: see Documentation/devicetree/bindings/serial/slave-device.txt
>  
> @@ -44,7 +45,7 @@ serial@...0000 {
>  
>  serial@...000 {
>  	bluetooth {
> -		compatible = "qcom,wcn3990-bt";
> +		compatible = "qcom,wcn399*-bt";

Typically wildcards aren't used in DT examples as Marcel already
mentioned on v3. IMO the wildcard degrades the value of the example,
rather than enhancing it. I think just listing the compatible string
is enough, no need for an wcn3998/x specific example since it's
essentialy the same as wcn3990.

Thanks

Matthias