linux-kernel - Re: [PATCH v5 2/3] dt-bindings: net: bluetooth: Add qualcomm-bluetooth

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Date:   Tue, 20 Mar 2018 16:58:25 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Thierry Escande <thierry.escande@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Andy Gross <andy.gross@...aro.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        David Brown <david.brown@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-bluetooth@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] dt-bindings: net: bluetooth: Add
 qualcomm-bluetooth

Hi Thierry,

> Add binding document for serial bluetooth chips using Qualcomm protocol.
> 
> Signed-off-by: Thierry Escande <thierry.escande@...aro.org>
> ---
> 
> v5:
> - Rename 'bt-disable-n' gpio as 'enable'
> 
> v4:
> - Move bt-disable-n-gpios to required properties section
> - Add clocks and pinctrl-0 as required properties
> 
> v3: no change
> v2: no change
> 
> .../devicetree/bindings/net/qualcomm-bluetooth.txt | 34 ++++++++++++++++++++++
> 1 file changed, 34 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> new file mode 100644
> index 000000000000..bbc2973634b2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> @@ -0,0 +1,34 @@
> +Qualcomm Bluetooth Chips
> +---------------------
> +
> +This documents the binding structure and common properties for serial
> +attached Qualcomm devices.
> +
> +Serial attached Qualcomm devices shall be a child node of the host UART
> +device the slave device is attached to.
> +
> +Required properties:
> + - compatible: should contain one of the following:
> +   * "qcom,qca6174-bt"
> + - enable-gpios: gpio specifier used to enable chip
> + - pinctrl-0: pin phandle for bt_en gpio
> + - clocks: clock phandle for SUSCLK_32KHZ

if I compare this with broadcom-bluetooth.txt or ti-bluetooth.txt then besides compatible, everything else is optional. The nokia-bluetooth.txt has everything required, but that is also a really specific platform.

Can we be less restrictive for a QCA general purpose chip?

> +
> +Example:
> +
> +serial@...0000 {
> +	pinctrl-names = "default", "sleep";
> +	pinctrl-0 = <&blsp1_uart1_default>;
> +	pinctrl-1 = <&blsp1_uart1_sleep>;
> +
> +	bluetooth {
> +		compatible = "qcom,qca6174-bt";
> +
> +		enable-gpios = <&pm8994_gpios 19 GPIO_ACTIVE_HIGH>;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&bt_en_pin_a>;

This one I do not understand and you might want to shed some light into why this is done that way.

> +
> +		clocks = <&divclk4>;

No clock-names?

Regards

Marcel