linux-kernel - Re: [PATCH v6 7/8] arm64: dts: ti: k3-j721s2-main: Add PCIe device tree node

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Message-ID: <Y3w+Xmn2ttRHM8ZM@ubuntu>
Date:   Mon, 21 Nov 2022 19:13:34 -0800
From:   Matt Ranostay <mranostay@...com>
To:     Andrew Davis <afd@...com>
CC:     <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <s-vadapalli@...com>, <r-gunasekaran@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 7/8] arm64: dts: ti: k3-j721s2-main: Add PCIe device
 tree node

On Mon, Nov 21, 2022 at 11:12:18AM -0600, Andrew Davis wrote:
> On 11/18/22 10:09 PM, Matt Ranostay wrote:
> > From: Aswath Govindraju <a-govindraju@...com>
> > 
> > Add PCIe device tree node (both RC and EP) for the single PCIe
> > instance present in j721s2.
> > 
> 
> So which is it, you have two nodes but this is one device. It can
> switch between the two modes, a property should have been used to
> select the mode for the device.
> 
> Making two nodes for the same device as examples of what they could
> look like, then only enabling one of the two in the board level DT
> is not how this is done anywhere else. Take the common parts and
> make one node here with those. Then at the board level .dts where we
> select what mode this driver will act in, add the specific bits for
> the chosen mode.
>

This isn't how it is done in k3-j7200-common-proc-board.dts and k3-j7200-main.dtsi
Now I'm fine with making it common node if that is way to go..

- Matt

> Andrew
> 
> > Reviewed-by: Siddharth Vadapalli <s-vadapalli@...com>
> > Signed-off-by: Aswath Govindraju <a-govindraju@...com>
> > Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> > Signed-off-by: Matt Ranostay <mranostay@...com>
> > ---
> >   arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 61 ++++++++++++++++++++++
> >   1 file changed, 61 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> > index adbb172658b9..04294e25d587 100644
> > --- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> > +++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> > @@ -841,6 +841,67 @@ serdes0: serdes@...0000 {
> >   		};
> >   	};
> > +	pcie1_rc: pcie@...0000 {
> > +		compatible = "ti,j7200-pcie-host", "ti,j721e-pcie-host";
> > +		reg = <0x00 0x02910000 0x00 0x1000>,
> > +		      <0x00 0x02917000 0x00 0x400>,
> > +		      <0x00 0x0d800000 0x00 0x00800000>,
> > +		      <0x00 0x18000000 0x00 0x00001000>;
> > +		reg-names = "intd_cfg", "user_cfg", "reg", "cfg";
> > +		interrupt-names = "link_state";
> > +		interrupts = <GIC_SPI 330 IRQ_TYPE_EDGE_RISING>;
> > +		device_type = "pci";
> > +		ti,syscon-pcie-ctrl = <&scm_conf 0x074>;
> > +		max-link-speed = <3>;
> > +		num-lanes = <4>;
> > +		power-domains = <&k3_pds 276 TI_SCI_PD_EXCLUSIVE>;
> > +		clocks = <&k3_clks 276 41>;
> > +		clock-names = "fck";
> > +		#address-cells = <3>;
> > +		#size-cells = <2>;
> > +		bus-range = <0x0 0xff>;
> > +		vendor-id = <0x104c>;
> > +		device-id = <0xb013>;
> > +		msi-map = <0x0 &gic_its 0x0 0x10000>;
> > +		dma-coherent;
> > +		ranges = <0x01000000 0x0 0x18001000  0x00 0x18001000  0x0 0x0010000>,
> > +			 <0x02000000 0x0 0x18011000  0x00 0x18011000  0x0 0x7fef000>;
> > +		dma-ranges = <0x02000000 0x0 0x0 0x0 0x0 0x10000 0x0>;
> > +		#interrupt-cells = <1>;
> > +		interrupt-map-mask = <0 0 0 7>;
> > +		interrupt-map = <0 0 0 1 &pcie1_intc 0>, /* INT A */
> > +				<0 0 0 2 &pcie1_intc 0>, /* INT B */
> > +				<0 0 0 3 &pcie1_intc 0>, /* INT C */
> > +				<0 0 0 4 &pcie1_intc 0>; /* INT D */
> > +
> > +		pcie1_intc: interrupt-controller {
> > +			interrupt-controller;
> > +			#interrupt-cells = <1>;
> > +			interrupt-parent = <&gic500>;
> > +			interrupts = <GIC_SPI 324 IRQ_TYPE_EDGE_RISING>;
> > +		};
> > +	};
> > +
> > +	pcie1_ep: pcie-ep@...0000 {
> > +		compatible = "ti,j7200-pcie-ep", "ti,j721e-pcie-ep";
> > +		reg = <0x00 0x02910000 0x00 0x1000>,
> > +		      <0x00 0x02917000 0x00 0x400>,
> > +		      <0x00 0x0d800000 0x00 0x00800000>,
> > +		      <0x00 0x18000000 0x00 0x08000000>;
> > +		reg-names = "intd_cfg", "user_cfg", "reg", "mem";
> > +		interrupt-names = "link_state";
> > +		interrupts = <GIC_SPI 330 IRQ_TYPE_EDGE_RISING>;
> > +		ti,syscon-pcie-ctrl = <&scm_conf 0x074>;
> > +		max-link-speed = <3>;
> > +		num-lanes = <4>;
> > +		power-domains = <&k3_pds 276 TI_SCI_PD_EXCLUSIVE>;
> > +		clocks = <&k3_clks 276 41>;
> > +		clock-names = "fck";
> > +		max-functions = /bits/ 8 <6>;
> > +		max-virtual-functions = /bits/ 8 <4 4 4 4 0 0>;
> > +		dma-coherent;
> > +	};
> > +
> >   	main_mcan0: can@...1000 {
> >   		compatible = "bosch,m_can";
> >   		reg = <0x00 0x02701000 0x00 0x200>,