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@xxxxxxx>
> ---
> 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@40000000 {
> <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.
Regards,
Lucas
> + <&clk IMX8MP_SYS_PLL2_50M>;
> + vpcie-supply = <®_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
