linux-kernel - Re: [PATCH v1 1/2] arm64: dts: qcom: sc7280: Add bluetooth node on SC7280 IDP board

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Message-ID: <YV3cVzI4aVeCjMt2@google.com>
Date:   Wed, 6 Oct 2021 10:26:47 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     marcel@...tmann.org, bjorn.andersson@...aro.org,
        johan.hedberg@...il.com, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org, rjliao@...eaurora.org,
        pharish@...eaurora.org, abhishekpandit@...omium.org
Subject: Re: [PATCH v1 1/2] arm64: dts: qcom: sc7280: Add bluetooth node on
 SC7280 IDP board

On Wed, Oct 06, 2021 at 06:00:02PM +0530, Balakrishna Godavarthi wrote:
> Add bluetooth SoC WCN6750 node for SC7280 IDP board.
> 
> Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7280-idp.dts  |  2 ++
>  arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 31 +++++++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dts b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> index 64fc22a..d3f5393 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
> @@ -17,6 +17,8 @@
>  
>  	aliases {
>  		serial0 = &uart5;
> +		bluetooth0 = &bluetooth;
> +		hsuart0 = &uart7;

Sort aliases alphabetically.

Also 'hsuart' should not be used, as Dmitry already pointed out on
patch 2/2. I suppose it should be 'serial1', as in 'second serial
port of the board'.

>  	};
>  
>  	chosen {
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index 272d5ca..05aa729 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -393,6 +393,24 @@
>  				<&tlmm 31 IRQ_TYPE_EDGE_FALLING>;
>  	pinctrl-names = "default", "sleep";
>  	pinctrl-1 = <&qup_uart7_sleep_cts>, <&qup_uart7_sleep_rts>, <&qup_uart7_sleep_tx>, <&qup_uart7_sleep_rx>;
> +
> +	bluetooth: wcn6750-bt {
> +		compatible = "qcom,wcn6750-bt";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&bt_en_default>;

Do we also need a pinctrl entry for 'swctrl' ?

> +		enable-gpios = <&tlmm 85 GPIO_ACTIVE_HIGH>; /* BT_EN */
> +		swctrl-gpios = <&tlmm 86 GPIO_ACTIVE_HIGH>; /* SW_CTRL */

The comments aren't useful, the property names say the same.

> +		vddio-supply = <&vreg_l19b_1p8>;
> +		vddaon-supply = <&vreg_s7b_0p9>;
> +		vddbtcxmx-supply = <&vreg_s7b_0p9>;
> +		vddrfacmn-supply = <&vreg_s7b_0p9>;
> +		vddrfa0p8-supply = <&vreg_s7b_0p9>;
> +		vddrfa1p7-supply = <&vreg_s1b_1p8>;
> +		vddrfa1p2-supply = <&vreg_s8b_1p2>;
> +		vddrfa2p2-supply = <&vreg_s1c_2p2>;
> +		vddasd-supply = <&vreg_l11c_2p8>;
> +		max-speed = <3200000>;
> +	};
>  };
>  
>  /* PINCTRL - additions to nodes defined in sc7280.dtsi */
> @@ -504,6 +522,19 @@
>  		 */
>  		bias-pull-up;
>  	};
> +
> +	bt_en_default: bt_en_default {

	bt_en: bt-en {

> +		pinmux {
> +			pins = "gpio85";
> +			function = "gpio";
> +		};
> +		pinconf {
> +			pins = "gpio85";
> +			drive-strength = <2>;
> +			output-low;
> +			bias-pull-down;
> +		};

No pinmux & pinconf nodes, see configuration for other pins.