linux-kernel - Re: [PATCH v3] arm64: dts: qcom: sc7280: Add bluetooth node on SC7280

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Date:   Wed, 15 Dec 2021 22:25:41 +0530
From:   bgodavar@...eaurora.org
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        bjorn.andersson@...aro.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org, rjliao@...eaurora.org,
        hbandi@...eaurora.org, abhishekpandit@...omium.org,
        mcchou@...omium.org, saluvala@...eaurora.org,
        Balakrishna Godavarthi <bgodavar@...eauroa.org>
Subject: Re: [PATCH v3] arm64: dts: qcom: sc7280: Add bluetooth node on SC7280

Hi Matthias,

On 2021-12-07 20:18, Matthias Kaehlcke wrote:
> On Tue, Dec 07, 2021 at 11:43:43AM +0530, Balakrishna Godavarthi wrote:
> 
>> Subject: arm64: dts: qcom: sc7280: Add bluetooth node on SC7280
> 
> nit: the node is added to the IDP boards, not sc7280 in general
> 
[Bala]: will update it.

>> From: Balakrishna Godavarthi <bgodavar@...eauroa.org>
>> 
>> Add bluetooth SoC WCN6750 node for SC7280 IDP boards.
>> 
>> Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
>> ---
>> v3:
>>   * Addressed reviewers comments
> 
> that's not overly useful, instead you should describe what changed
> 
>>   * Added pin config for sw_ctrl line.
>> v2:
>>   * merged two patches into one
>>   * Removed unused comments
>>   * Removed pinmux & pin conf.
>>   * Addressed reviewers comments
>> 
>> v1: initial patch
>> ---
>>  arch/arm64/boot/dts/qcom/sc7280-idp.dts  |  4 ++++
>>  arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 37 
>> ++++++++++++++++++++++++++++++++
>>  arch/arm64/boot/dts/qcom/sc7280-idp2.dts |  4 ++++
>>  3 files changed, 45 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dts 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> index 9b991ba..19bd228 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> @@ -56,6 +56,10 @@
>>  	};
>>  };
>> 
>> +&bluetooth {
>> +	vddio-supply = <&vreg_l19b_1p8>;
>> +};
>> +
>>  &ipa {
>>  	status = "okay";
>>  	modem-init;
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> index d623d71..b8b00dc 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> @@ -14,6 +14,11 @@
>>  #include "pmk8350.dtsi"
>> 
>>  / {
>> +	aliases {
>> +		bluetooth0 = &bluetooth;
>> +		serial1 = &uart7;
>> +	};
>> +
>>  	gpio-keys {
>>  		compatible = "gpio-keys";
>>  		label = "gpio-keys";
>> @@ -422,6 +427,23 @@
>>  				<&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: bluetooth {
>> +		compatible = "qcom,wcn6750-bt";
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&bt_en>, <&swctrl_gpio>;
>> +		enable-gpios = <&tlmm 85 GPIO_ACTIVE_HIGH>;
>> +		swctrl-gpios = <&tlmm 86 GPIO_ACTIVE_HIGH>;
>> +		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 */
>> @@ -491,6 +513,14 @@
>>  };
>> 
>>  &tlmm {
>> +	bt_en: bt-en {
>> +		pins = "gpio85";
>> +		function = "gpio";
>> +		drive-strength = <2>;
> 
> is it really necessary to specify the drive strength?
> 
> Documentation/devicetree/bindings/pinctrl/qcom,sc7280-pinctrl.yaml:
> 
>   drive-strength:
>     enum: [2, 4, 6, 8, 10, 12, 14, 16]
>     default: 2
> 
> The default is 2, so it shouldn't be needed.
> 
[Bala]: will update it.
>> +		output-low;
>> +		bias-disable;
>> +	};
>> +
>>  	nvme_pwren: nvme-pwren {
>>  		function = "gpio";
>>  	};
>> @@ -554,6 +584,13 @@
>>  		 */
>>  		bias-pull-up;
>>  	};
>> +
>> +	swctrl_gpio: swctrl-gpio {
> 
> The 'gpio' suffix isn't really useful.
> 
> I suggest to use the signal name from the schematics "mos-sw-ctrl" or
> call it "bt-sw-ctrl". If you use the schematic name then this should
> be also done for the enable pin.
[Bala]: will update it.