linux-kernel - Re: [PATCH v9 3/4] arm64: dts: qcom: sc7280: Add PCIe nodes for IDP board

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Date:   Fri, 01 Oct 2021 09:59:39 +0530
From:   Prasad Malisetty <pmaliset@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     agross@...nel.org, bhelgaas@...gle.com, bjorn.andersson@...aro.org,
        lorenzo.pieralisi@....com, robh+dt@...nel.org,
        svarbanov@...sol.com, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, dianders@...omium.org,
        mka@...omium.org, vbadigan@...eaurora.org, sallenki@...eaurora.org,
        manivannan.sadhasivam@...aro.org
Subject: Re: [PATCH v9 3/4] arm64: dts: qcom: sc7280: Add PCIe nodes for IDP
 board

On 2021-09-29 02:22, Stephen Boyd wrote:
> Quoting Prasad Malisetty (2021-09-28 06:55:49)
>> Enable PCIe controller and PHY for sc7280 IDP board.
>> Add specific NVMe GPIO entries for SKU1 and SKU2 support.
>> 
>> Signed-off-by: Prasad Malisetty <pmaliset@...eaurora.org>
>> ---
>>  arch/arm64/boot/dts/qcom/sc7280-idp.dts  |  9 ++++++
>>  arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 54 
>> ++++++++++++++++++++++++++++++++
>>  arch/arm64/boot/dts/qcom/sc7280-idp2.dts |  9 ++++++
>>  3 files changed, 72 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dts 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> index 64fc22a..1562386 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> @@ -61,6 +61,15 @@
>>         modem-init;
>>  };
>> 
>> +&nvme_pwren_pin {
>> +       pins = "gpio19";
>> +};
> 
> This should move to the bottom in the "pinctrl" section.
> 
Hi Stephen,

There is no pinctrl section in this file. we defined nvme_pwren_pin in 
common IDP file(sc7280-idp.dtsi) and using the nvme_pwren_pin reference 
to define SKU specific gpio pin for SKU1 and SKU2 support.

Thanks
-Prasad
>> +
>> +&nvme_3v3_regulators {
>> +       gpio = <&tlmm 19 GPIO_ACTIVE_HIGH>;
>> +       enable-active-high;
> 
> The enable-active-high can be in the idp.dtsi file? That doesn't seem 
> to
> change.
> 
>> +};
>> +
>>  &pmk8350_vadc {
>>         pmr735a_die_temp {
>>                 reg = <PMR735A_ADC7_DIE_TEMP>;
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> index def22ff..5b5505f 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>> @@ -31,6 +31,17 @@
>>                         linux,can-disable;
>>                 };
>>         };
>> +
>> +       nvme_3v3_regulators: nvme-3v3-regulators {
> 
> Why plural? Isn't it a single regulator?
> 
Sure, I will update in next version

Thanks
-Prasad
>> +               compatible = "regulator-fixed";
>> +               regulator-name = "VLDO_3V3";
>> +
>> +               regulator-min-microvolt = <3300000>;
>> +               regulator-max-microvolt = <3300000>;
>> +
>> +               pinctrl-names = "default";
>> +               pinctrl-0 = <&nvme_pwren_pin>;
>> +       };
>>  };
>> 
>>  &apps_rsc {
>> @@ -220,6 +231,42 @@
>>         modem-init;
>>  };
>> 
>> +&pcie1 {
>> +       status = "okay";
>> +       perst-gpio = <&tlmm 2 GPIO_ACTIVE_LOW>;
>> +
>> +       vddpe-3v3-supply = <&nvme_3v3_regulators>;
>> +
>> +       pinctrl-names = "default";
>> +       pinctrl-0 = <&pcie1_default_state>;
>> +};
>> +
>> +&pcie1_phy {
>> +       status = "okay";
>> +
>> +       vdda-phy-supply = <&vreg_l10c_0p8>;
>> +       vdda-pll-supply = <&vreg_l6b_1p2>;
>> +};
>> +
>> +&pcie1_default_state {
> 
> I thought the node would be split into a reset config node and a wake
> config node. Is that not being done for some reason? The pinctrl-0 
> would
> look like
> 
Agree, I will incorporate the changes in next version.

> 	pinctrl-0 = <&pcie1_default_state>, <&pcie1_reset_n>, <&pcie1_wake_n>;
> 
>> +       reset-n {
>> +               pins = "gpio2";
>> +               function = "gpio";
>> +
>> +               drive-strength = <16>;
>> +               output-low;
>> +               bias-disable;
>> +       };
>> +
>> +       wake-n {
>> +               pins = "gpio3";
>> +               function = "gpio";
>> +
>> +               drive-strength = <2>;
>> +               bias-pull-up;
>> +       };
>> +};
>> +
>>  &pmk8350_vadc {
>>         pmk8350_die_temp {
>>                 reg = <PMK8350_ADC7_DIE_TEMP>;
>> @@ -489,3 +536,10 @@
>>                 bias-pull-up;
>>         };
>>  };
>> +
>> +&tlmm {
>> +       nvme_pwren_pin: nvme-pwren-pin {
>> +               function = "gpio";
>> +               bias-pull-up;
>> +       };
>> +};
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp2.dts 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp2.dts
>> index 1fc2add..0548cb6 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp2.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp2.dts
>> @@ -21,3 +21,12 @@
>>                 stdout-path = "serial0:115200n8";
>>         };
>>  };
>> +
>> +&nvme_pwren_pin {
>> +       pins = "gpio51";
>> +};
> 
> The pin config can go to a pinctrl section at the bottom of this file?
> 
Same as a like SKU1 (sc7280-idp.dts)
>> +
>> +&nvme_3v3_regulators {
>> +       gpio = <&tlmm 51 GPIO_ACTIVE_HIGH>;
>> +       enable-active-high;
>> +};