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SubjectRe: [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@codeauroa.org>
>>
>> Add bluetooth SoC WCN6750 node for SC7280 IDP boards.
>>
>> Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.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.

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