linux-kernel - Re: [PATCH v1 2/3] arm64: dts: mt8195: Add pcie and pcie phy nodes

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Date:   Thu, 20 Oct 2022 10:10:55 +0800
From:   Jianjun Wang <jianjun.wang@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <linux-pci@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v1 2/3] arm64: dts: mt8195: Add pcie and pcie phy nodes

Hi Angelo,

Thanks for your review.

On Wed, 2022-10-19 at 10:55 +0200, AngeloGioacchino Del Regno wrote:
> Il 17/10/22 09:08, Tinghan Shen ha scritto:
> > Add pcie and pcie phy nodes for mt8195.
> > 
> > Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> > Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> > ---
> >   arch/arm64/boot/dts/mediatek/mt8195.dtsi | 143
> > +++++++++++++++++++++++
> >   1 file changed, 143 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > index d03f0c2b8233..903e92d6156f 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
> > @@ -1182,6 +1182,104 @@
> >   			status = "disabled";
> >   		};
> >   
> > +		pcie0: pcie@...f0000 {
> > +			compatible = "mediatek,mt8195-pcie",
> > +				     "mediatek,mt8192-pcie";
> 
> ..snip..
> 
> > +
> > +			phys = <&pciephy>;
> > +			phy-names = "pcie-phy";
> > +
> > +			power-domains = <&spm
> > MT8195_POWER_DOMAIN_PCIE_MAC_P0>;
> 
> You're missing the resets:
> 
> 			resets = <&infracfg_ao
> MT8195_INFRA_RST2_PCIE_P0_SWRST>;
> 			reset-names = "mac";
> 
> > +
> > +			#interrupt-cells = <1>;
> > +			interrupt-map-mask = <0 0 0 7>;
> 
> ..snip..
> 
> > +		};
> > +
> > +		pcie1: pcie@...f8000 {
> > +			compatible = "mediatek,mt8195-pcie",
> > +				     "mediatek,mt8192-pcie";
> 
> ..snip..
> 
> > +			power-domains = <&spm
> > MT8195_POWER_DOMAIN_PCIE_MAC_P1>;
> 
> Here too:
> 			resets = <&infracfg_ao
> MT8195_INFRA_RST2_USBSIF_P1_SWRST>,

Reset the combo-phy in PCIe driver will cause side effect on USB2 port,
so this reset cannot be added.

We will fix others in the next version.

Thanks.
> 				 <&infracfg_ao
> MT8195_INFRA_RST2_PCIE_P1_SWRST>;
> 			reset-names = "phy", "mac";
> 
> > +
> > +			#interrupt-cells = <1>;
> 
> ..snip..
> 
> > @@ -1241,6 +1339,34 @@
> >   				reg = <0x189 0x2>;
> >   				bits = <7 5>;
> >   			};
> > +			pciephy_rx_ln1: pciephy-rx-ln1@190 {
> > +				reg = <0x190 0x1>;
> > +				bits = <0 4>;
> > +			};
> > +			pciephy_tx_ln1_nmos: pciephy-tx-ln1-nmos@190 {
> 
> Please run dtbs_check and try to build the kernel before pushing
> commits upstream.
> This will give you a not-so-nice warning and that shall not happen.
> 
> You can solve it by naming these nodes like:
> pciephy-rx-ln1@190,1
> pciephy-tx-ln1-nmos@190,2
> 
> ...etc
> 
> Regards,
> Angelo
> 
>