linux-kernel - Re: [PATCH] arm64: dts: imx8mp-venice-gw74xx: add PCIe support

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Message-ID: <CAJ+vNU2sKkjv1q=oPD++1DE7uUiXJYi75-fpRRNboabUbUwCqA@mail.gmail.com>
Date:   Fri, 9 Sep 2022 10:42:03 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Alexander Stein <alexander.stein@...tq-group.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, NXP Linux Team <linux-imx@....com>,
        Fabio Estevam <festevam@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] arm64: dts: imx8mp-venice-gw74xx: add PCIe support

On Thu, Sep 8, 2022 at 10:59 PM Alexander Stein
<alexander.stein@...tq-group.com> wrote:
>
> Hi Tim,
>
> Am Donnerstag, 8. September 2022, 17:49:03 CEST schrieb Tim Harvey:
> > Add PCIe support on the Gateworks GW74xx board. While at it,
> > fix the related gpio line names from the previous incorrect values.
> >
> > Signed-off-by: Tim Harvey <tharvey@...eworks.com>
> > ---
> >  .../dts/freescale/imx8mp-venice-gw74xx.dts    | 40 +++++++++++++++++--
> >  1 file changed, 37 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts
> > b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts index
> > e0fe356b662d..7644db61d631 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts
> > @@ -8,6 +8,7 @@
> >  #include <dt-bindings/gpio/gpio.h>
> >  #include <dt-bindings/input/linux-event-codes.h>
> >  #include <dt-bindings/leds/common.h>
> > +#include <dt-bindings/phy/phy-imx8-pcie.h>
> >
> >  #include "imx8mp.dtsi"
> >
> > @@ -100,6 +101,12 @@ led-1 {
> >               };
> >       };
> >
> > +     pcie0_refclk: pcie0-refclk {
> > +             compatible = "fixed-clock";
> > +             #clock-cells = <0>;
> > +             clock-frequency = <100000000>;
> > +     };
> > +
> >       pps {
> >               compatible = "pps-gpio";
> >               pinctrl-names = "default";
> > @@ -215,8 +222,8 @@ &gpio1 {
> >  &gpio2 {
> >       gpio-line-names =
> >               "", "", "", "", "", "", "", "",
> > -             "", "", "", "", "", "", "", "",
> > -             "pcie3_wdis#", "", "", "pcie1_wdis@", "pcie2_wdis#", "",
> "", "",
> > +             "", "", "", "", "", "", "pcie3_wdis#", "",
> > +             "", "", "pcie2_wdis#", "", "", "", "", "",
> >               "", "", "", "", "", "", "", "";
> >  };
> >
> > @@ -562,6 +569,28 @@ &i2c4 {
> >       status = "okay";
> >  };
> >
> > +&pcie_phy {
> > +     fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
> > +     fsl,clkreq-unsupported;
> > +     clocks = <&pcie0_refclk>;
> > +     clock-names = "ref";
> > +     status = "okay";
> > +};
> > +
> > +&pcie {
> > +     pinctrl-names = "default";
> > +     pinctrl-0 = <&pinctrl_pcie0>;
> > +     reset-gpio = <&gpio2 17 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";
>
> With the still pending dt-binding patch at [1] the clock order shall be
> "pcie", "pcie_bus", "pcie_phy".
>
> Best regards,
> Alexander
>
> [1] https://lore.kernel.org/lkml/20220822184701.25246-2-Sergey.Semin@baikalelectronics.ru/
>

Alexander,

Interesting... the imx8pm-evk PCIe patch was accepted with the
bindings I used which are current. So I suppose if/when the patch you
pointed to gets accepted some existing bindings will need to change to
be compliant.

Best Regards,

Tim