linux-kernel - RE: [PATCH v2 6/7] arm64: dts: imx8mp-evk: Add PCIe support

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Message-ID: <AS8PR04MB86768CC849A35D5B1EF75DEE8CF39@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date:   Mon, 18 Apr 2022 04:55:49 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "alexander.stein@...tq-group.com" <alexander.stein@...tq-group.com>
CC:     "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH v2 6/7] arm64: dts: imx8mp-evk: Add PCIe support

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2022年4月15日 5:05
> To: Hongxing Zhu <hongxing.zhu@....com>; p.zabel@...gutronix.de;
> bhelgaas@...gle.com; lorenzo.pieralisi@....com; robh@...nel.org;
> shawnguo@...nel.org; vkoul@...nel.org; alexander.stein@...tq-group.com
> Cc: linux-phy@...ts.infradead.org; devicetree@...r.kernel.org;
> linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>
> Subject: Re: [PATCH v2 6/7] arm64: dts: imx8mp-evk: Add PCIe support
> 
> Am Montag, dem 07.03.2022 um 17:07 +0800 schrieb Richard Zhu:
> > Add PCIe support on i.MX8MP EVK board.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8mp-evk.dts | 55
> > ++++++++++++++++++++
> >  1 file changed, 55 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> > b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> > index 2eb943210678..ed77455a3f73 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp-evk.dts
> > @@ -5,6 +5,7 @@
> >
> >  /dts-v1/;
> >
> > +#include <dt-bindings/phy/phy-imx8-pcie.h>
> >  #include "imx8mp.dtsi"
> >
> >  / {
> > @@ -33,6 +34,12 @@ memory@...00000 {
> >  		      <0x1 0x00000000 0 0xc0000000>;
> >  	};
> >
> > +	pcie0_refclk: pcie0-refclk {
> > +		compatible = "fixed-clock";
> > +			#clock-cells = <0>;
> > +			clock-frequency = <100000000>;
> > +	};
> > +
> >  	reg_can1_stby: regulator-can1-stby {
> >  		compatible = "regulator-fixed";
> >  		regulator-name = "can1-stby";
> > @@ -55,6 +62,17 @@ reg_can2_stby: regulator-can2-stby {
> >  		enable-active-high;
> >  	};
> >
> > +	reg_pcie0: regulator-pcie {
> > +		compatible = "regulator-fixed";
> > +		pinctrl-names = "default";
> > +		pinctrl-0 = <&pinctrl_pcie0_reg>;
> > +		regulator-name = "MPCIE_3V3";
> > +		regulator-min-microvolt = <3300000>;
> > +		regulator-max-microvolt = <3300000>;
> > +		gpio = <&gpio2 6 GPIO_ACTIVE_HIGH>;
> > +		enable-active-high;
> > +	};
> > +
> >  	reg_usdhc2_vmmc: regulator-usdhc2 {
> >  		compatible = "regulator-fixed";
> >  		pinctrl-names = "default";
> > @@ -297,6 +315,30 @@ pca6416: gpio@20 {
> >  	};
> >  };
> >
> > +&pcie_phy {
> > +	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
> > +	clocks = <&pcie0_refclk>;
> > +	clock-names = "ref";
> > +	status = "okay";
> > +};
> > +
> > +&pcie{
> > +	pinctrl-names = "default";
> > +	pinctrl-0 = <&pinctrl_pcie0>;
> > +	reset-gpio = <&gpio2 7 GPIO_ACTIVE_LOW>;
> > +	clocks = <&clk IMX8MP_CLK_HSIO_ROOT>,
> > +		 <&clk IMX8MP_CLK_PCIE_ROOT>,
> > +		 <&clk IMX8MP_CLK_HSIO_AXI>;
> > +	clock-names = "pcie", "pcie_aux", "pcie_bus";
> > +	assigned-clocks = <&clk IMX8MP_CLK_HSIO_AXI>,
> > +			  <&clk IMX8MP_CLK_PCIE_AUX>;
> > +	assigned-clock-rates = <500000000>, <10000000>;
> > +	assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_500M>,
> 
> You don't need to set the IMX8MP_CLK_HSIO_AXI clock rate here, that's
> already don't by the power-domain, as it is keeping this bus clock active. Only
> need to set the PCIE_AUX rate here.
Thanks, for your review comments.
Would be changed in next version.

Best Regards
Richard Zhu
> 
> Regards,
> Lucas
> 
> > +				 <&clk IMX8MP_SYS_PLL2_50M>;
> > +	vpcie-supply = <&reg_pcie0>;
> > +	status = "okay";
> > +};
> > +
> >  &snvs_pwrkey {
> >  	status = "okay";
> >  };
> > @@ -442,6 +484,19 @@ MX8MP_IOMUXC_I2C3_SDA__I2C3_SDA
> 	0x400001c3
> >  		>;
> >  	};
> >
> > +	pinctrl_pcie0: pcie0grp {
> > +		fsl,pins = <
> > +			MX8MP_IOMUXC_I2C4_SCL__PCIE_CLKREQ_B	0x61 /* open
> drain, pull up */
> > +			MX8MP_IOMUXC_SD1_DATA5__GPIO2_IO07	0x41
> > +		>;
> > +	};
> > +
> > +	pinctrl_pcie0_reg: pcie0reggrp {
> > +		fsl,pins = <
> > +			MX8MP_IOMUXC_SD1_DATA4__GPIO2_IO06	0x41
> > +		>;
> > +	};
> > +
> >  	pinctrl_pmic: pmicgrp {
> >  		fsl,pins = <
> >  			MX8MP_IOMUXC_GPIO1_IO03__GPIO1_IO03	0x000001c0
>