linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc7280: Add bluetooth node on SC7280

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Date:   Tue, 12 Oct 2021 10:24:18 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        bjorn.andersson@...aro.org, johan.hedberg@...il.com,
        marcel@...tmann.org
Cc:     mka@...omium.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org, pharish@...eaurora.org,
        rjliao@...eaurora.org, hbandi@...eaurora.org,
        saluvala@...eaurora.org, abhishekpandit@...omium.org
Subject: Re: [PATCH v2] arm64: dts: qcom: sc7280: Add bluetooth node on SC7280

Quoting Balakrishna Godavarthi (2021-10-12 06:01:38)
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> index 272d5ca..09adc802 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
> @@ -393,6 +393,23 @@
>                                 <&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 {

bluetooth: bluetooth {

Node names should be generic.

> +               compatible = "qcom,wcn6750-bt";
> +               pinctrl-names = "default";
> +               pinctrl-0 = <&bt_en_default>;
> +               enable-gpios = <&tlmm 85 GPIO_ACTIVE_HIGH>;
> +               swctrl-gpios = <&tlmm 86 GPIO_ACTIVE_HIGH>;

Is there any pinctrl config for gpio 86?

> +               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 +521,14 @@
>                  */
>                 bias-pull-up;
>         };
> +
> +       bt_en_default: bt_en_default {

bt_en: bt-en {

Node names shouldn't have underscores and 'default' is redundant.

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

Why is there a pull down on an output gpio? Shouldn't this be
bias-disable?

> +       };
>  };
>
>  &sdc1_on {