[PATCH v2 5/7] arm64: dts: imx8mp: add the iMX8MP PCIe support

[Tim Harvey]

On Sun, Apr 17, 2022 at 10:00 PM Hongxing Zhu <hongxing.zhu at nxp.com> wrote:
>
> > -----Original Message-----
> > From: Lucas Stach <l.stach at pengutronix.de>
> > Sent: 2022年4月15日 5:03
> > To: Hongxing Zhu <hongxing.zhu at nxp.com>; p.zabel at pengutronix.de;
> > bhelgaas at google.com; lorenzo.pieralisi at arm.com; robh at kernel.org;
> > shawnguo at kernel.org; vkoul at kernel.org; alexander.stein at ew.tq-group.com
> > Cc: linux-phy at lists.infradead.org; devicetree at vger.kernel.org;
> > linux-pci at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> > linux-kernel at vger.kernel.org; kernel at pengutronix.de; dl-linux-imx
> > <linux-imx at nxp.com>
> > Subject: Re: [PATCH v2 5/7] arm64: dts: imx8mp: add the iMX8MP PCIe
> > support
> >
> > Am Montag, dem 07.03.2022 um 17:07 +0800 schrieb Richard Zhu:
> > > Add the i.MX8MP PCIe support.
> > >
> > > Signed-off-by: Richard Zhu <hongxing.zhu at nxp.com>
> > > ---
> > >  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 46
> > > ++++++++++++++++++++++-
> > >  1 file changed, 45 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > index b40a5646f205..e7b3d8029e34 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> > > @@ -5,6 +5,7 @@
> > >
> > >  #include <dt-bindings/clock/imx8mp-clock.h>
> > >  #include <dt-bindings/power/imx8mp-power.h>
> > > +#include <dt-bindings/reset/imx8mp-reset.h>
> > >  #include <dt-bindings/gpio/gpio.h>
> > >  #include <dt-bindings/input/input.h>
> > >  #include <dt-bindings/interrupt-controller/arm-gic.h>
> > > @@ -375,7 +376,8 @@ iomuxc: pinctrl at 30330000 {
> > >                     };
> > >
> > >                     gpr: iomuxc-gpr at 30340000 {
> > > -                           compatible = "fsl,imx8mp-iomuxc-gpr", "syscon";
> > > +                           compatible = "fsl,imx8mp-iomuxc-gpr",
> > > +                                        "fsl,imx6q-iomuxc-gpr", "syscon";
> > >                             reg = <0x30340000 0x10000>;
> > >                     };
> > >
> > > @@ -965,6 +967,17 @@ aips4: bus at 32c00000 {
> > >                     #size-cells = <1>;
> > >                     ranges;
> > >
> > > +                   pcie_phy: pcie-phy at 32f00000 {
> > > +                           compatible = "fsl,imx8mp-pcie-phy";
> > > +                           reg = <0x32f00000 0x10000>;
> > > +                           resets = <&src IMX8MP_RESET_PCIEPHY>,
> > > +                                    <&src IMX8MP_RESET_PCIEPHY_PERST>;
> > > +                           reset-names = "pciephy", "perst";
> > > +                           power-domains = <&hsio_blk_ctrl
> > IMX8MP_HSIOBLK_PD_PCIE_PHY>;
> > > +                           #phy-cells = <0>;
> > > +                           status = "disabled";
> > > +                   };
> > > +
> > >                     hsio_blk_ctrl: blk-ctrl at 32f10000 {
> > >                             compatible = "fsl,imx8mp-hsio-blk-ctrl", "syscon";
> > >                             reg = <0x32f10000 0x24>;
> > > @@ -980,6 +993,37 @@ hsio_blk_ctrl: blk-ctrl at 32f10000 {
> > >                     };
> > >             };
> > >
> > > +           pcie: pcie at 33800000 {
> > > +                   compatible = "fsl,imx8mp-pcie";
> > > +                   reg = <0x33800000 0x400000>, <0x1ff00000 0x80000>;
> > > +                   reg-names = "dbi", "config";
> > > +                   #address-cells = <3>;
> > > +                   #size-cells = <2>;
> > > +                   device_type = "pci";
> > > +                   bus-range = <0x00 0xff>;
> > > +                   ranges =  <0x81000000 0 0x00000000 0x1ff80000 0
> > 0x00010000 /* downstream I/O 64KB */
> > > +                              0x82000000 0 0x18000000 0x18000000 0
> > 0x07f00000>; /* non-prefetchable memory */
> > > +                   num-lanes = <1>;
> > > +                   num-viewport = <4>;
> > > +                   interrupts = <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>;
> > > +                   interrupt-names = "msi";
> > > +                   #interrupt-cells = <1>;
> > > +                   interrupt-map-mask = <0 0 0 0x7>;
> > > +                   interrupt-map = <0 0 0 1 &gic GIC_SPI 126
> > IRQ_TYPE_LEVEL_HIGH>,
> > > +                                   <0 0 0 2 &gic GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                   <0 0 0 3 &gic GIC_SPI 124 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                   <0 0 0 4 &gic GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
> > > +                   fsl,max-link-speed = <3>;
> >
> > I believe that imx6_pcie_start_link does not properly handle Gen3 speeds.
> Good caught.
> The according link_gen condition should be changed in driver too.
> Would be changed in next version.
> Thanks.
>
> Best Regards
> Richard Zhu
> >
> > Regards,
> > Lucas
> >
> > > +                   linux,pci-domain = <0>;
> > > +                   power-domains = <&hsio_blk_ctrl IMX8MP_HSIOBLK_PD_PCIE>;
> > > +                   resets = <&src IMX8MP_RESET_PCIE_CTRL_APPS_EN>,
> > > +                            <&src IMX8MP_RESET_PCIE_CTRL_APPS_TURNOFF>;
> > > +                   reset-names = "apps", "turnoff";
> > > +                   phys = <&pcie_phy>;
> > > +                   phy-names = "pcie-phy";
> > > +                   status = "disabled";
> > > +           };
> > > +
> > >             gpu3d: gpu at 38000000 {
> > >                     compatible = "vivante,gc";
> > >                     reg = <0x38000000 0x8000>;
> >
>

Richard,

Do you have an updated series for IMX8MP PCIe yet? I believe
everything you were waiting on is now merged (blk-ctrl and
power-domain).

Best Regards,

Tim