linux-kernel - Re: [PATCH v2 1/2] arm64: dts: ti: k3-j721e-evm: Add overlay for PCIE0 Endpoint Mode

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Message-ID: <c50f5dc2-8ab8-4213-a809-fcd4cd18589d@ti.com>
Date:   Tue, 5 Dec 2023 10:13:07 -0600
From:   Andrew Davis <afd@...com>
To:     Siddharth Vadapalli <s-vadapalli@...com>, <nm@...com>,
        <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <r-gunasekaran@...com>,
        <srk@...com>
Subject: Re: [PATCH v2 1/2] arm64: dts: ti: k3-j721e-evm: Add overlay for
 PCIE0 Endpoint Mode

On 11/15/23 2:52 AM, Siddharth Vadapalli wrote:
> Add overlay to enable the PCIE0 instance of PCIe on J721E-EVM in
> Endpoint mode of operation.
> 
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> ---
>   arch/arm64/boot/dts/ti/Makefile               |  3 ++
>   .../boot/dts/ti/k3-j721e-evm-pcie0-ep.dtso    | 53 +++++++++++++++++++
>   2 files changed, 56 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/ti/k3-j721e-evm-pcie0-ep.dtso
> 
> diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
> index 77a347f9f47d..5620db44d4dc 100644
> --- a/arch/arm64/boot/dts/ti/Makefile
> +++ b/arch/arm64/boot/dts/ti/Makefile
> @@ -66,6 +66,8 @@ dtb-$(CONFIG_ARCH_K3) += k3-j7200-evm.dtb
>   k3-j721e-evm-dtbs := k3-j721e-common-proc-board.dtb k3-j721e-evm-quad-port-eth-exp.dtbo
>   dtb-$(CONFIG_ARCH_K3) += k3-j721e-beagleboneai64.dtb
>   dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm.dtb
> +k3-j721e-evm-pcie0-ep-dtbs := k3-j721e-evm.dtb k3-j721e-evm-pcie0-ep.dtbo
> +dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm-pcie0-ep.dtb

Do you really need to produce this pre-combined DTB file? If you would rather
just the overlay produced which could be applied at load-time (I prefer this),
then you should do as Jai has done[0]. Add just the overlay, and test its
application using a dummy target.

Andrew

[0] https://www.spinics.net/lists/kernel/msg5015247.html

>   dtb-$(CONFIG_ARCH_K3) += k3-j721e-evm-gesi-exp-board.dtbo
>   dtb-$(CONFIG_ARCH_K3) += k3-j721e-sk.dtb
>   
> @@ -85,4 +87,5 @@ DTC_FLAGS_k3-am625-sk += -@
>   DTC_FLAGS_k3-am62-lp-sk += -@
>   DTC_FLAGS_k3-am6548-iot2050-advanced-m2 += -@
>   DTC_FLAGS_k3-j721e-common-proc-board += -@
> +DTC_FLAGS_k3-j721e-evm += -@
>   DTC_FLAGS_k3-j721s2-common-proc-board += -@
> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-evm-pcie0-ep.dtso b/arch/arm64/boot/dts/ti/k3-j721e-evm-pcie0-ep.dtso
> new file mode 100644
> index 000000000000..0c82a13b65a4
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ti/k3-j721e-evm-pcie0-ep.dtso
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/**
> + * DT Overlay for enabling PCIE0 instance in Endpoint Configuration with the
> + * J7 common processor board.
> + *
> + * J7 Common Processor Board Product Link: https://www.ti.com/tool/J721EXCPXEVM
> + *
> + * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/soc/ti,sci_pm_domain.h>
> +
> +#include "k3-pinctrl.h"
> +
> +/*
> + * Since Root Complex and Endpoint modes are mutually exclusive
> + * disable Root Complex mode.
> + */
> +&pcie0_rc {
> +	status = "disabled";
> +};
> +
> +&cbass_main {
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +	interrupt-parent = <&gic500>;
> +
> +	pcie0_ep: pcie-ep@...0000 {
> +		compatible = "ti,j721e-pcie-ep";
> +		reg = <0x00 0x02900000 0x00 0x1000>,
> +		      <0x00 0x02907000 0x00 0x400>,
> +		      <0x00 0x0d000000 0x00 0x00800000>,
> +		      <0x00 0x10000000 0x00 0x08000000>;
> +		reg-names = "intd_cfg", "user_cfg", "reg", "mem";
> +		interrupt-names = "link_state";
> +		interrupts = <GIC_SPI 318 IRQ_TYPE_EDGE_RISING>;
> +		ti,syscon-pcie-ctrl = <&scm_conf 0x4070>;
> +		max-link-speed = <3>;
> +		num-lanes = <1>;
> +		power-domains = <&k3_pds 239 TI_SCI_PD_EXCLUSIVE>;
> +		clocks = <&k3_clks 239 1>;
> +		clock-names = "fck";
> +		max-functions = /bits/ 8 <6>;
> +		max-virtual-functions = /bits/ 8 <4 4 4 4 0 0>;
> +		dma-coherent;
> +		phys = <&serdes0_pcie_link>;
> +		phy-names = "pcie-phy";
> +	};
> +};