linux-kernel - Re: [RESEND PATCH V3 2/3] arm64: dts: ti: Add initial support for AM68 SK System on Module

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Date:   Fri, 13 Jan 2023 17:23:56 +0530
From:   Vaishnav Achath <vaishnav.a@...com>
To:     Sinthu Raja <sinthu.raja@...tralsolutions.com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Sinthu Raja <sinthu.raja@...com>
Subject: Re: [RESEND PATCH V3 2/3] arm64: dts: ti: Add initial support for
 AM68 SK System on Module

Hi Sinthu,

On 10/01/23 16:30, Sinthu Raja wrote:
> From: Sinthu Raja <sinthu.raja@...com>
> 
> AM68 Starter Kit (SK) is a low cost, small form factor board designed
> for TI’s AM68 SoC. TI’s AM68 SoC comprises of dual core A72, high
> performance vision accelerators, hardware accelerators, latest C71x
> DSP, high bandwidth real-time IPs for capture and display. The SoC is
> power optimized to provide best in class performance for industrial
> applications.
> 
>     AM68 SK supports the following interfaces:
>       * 16 GB LPDDR4 RAM
>       * x1 Gigabit Ethernet interface
>       * x1 USB 3.1 Type-C port
>       * x2 USB 3.1 Type-A ports
>       * x1 PCIe M.2 M Key
>       * 512 Mbit OSPI flash
>       * x2 CSI2 Camera interface (RPi and TI Camera connector)
>       * 40-pin Raspberry Pi GPIO header
> 
> SK's System on Module (SoM) contains the SoC and DDR.
> Therefore, add DT node for the SOC and DDR on the SoM.
> 
> Schematics: https://www.ti.com/lit/zip/SPRR463
> TRM: http://www.ti.com/lit/pdf/spruj28
> 
> Signed-off-by: Sinthu Raja <sinthu.raja@...com>
> ---
> 
> Changes in V3:
> =============
> Addressed review comments
>  - Removed the unused nodes that are disabled by default.
> OSPI support will be added once the OSPI node is enabled for J721s2/AM68 in main DTSI.
> 
> Changes in V2:
> =============
> Address review comments
>  - drop the empty lines.
> 
> V1: https://lore.kernel.org/linux-arm-kernel/20221018123849.23695-3-sinthu.raja@ti.com/
> V2: https://lore.kernel.org/lkml/20221107123852.8063-3-sinthu.raja@ti.com/
> 
>  arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi | 31 ++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi b/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi
> new file mode 100644
> index 000000000000..c35f81edee8c
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi
> @@ -0,0 +1,31 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
> + */
> +
> +/dts-v1/;
> +
> +#include "k3-j721s2.dtsi"
> +#include <dt-bindings/gpio/gpio.h>
> +
> +/ {
> +	memory@...00000 {
> +		device_type = "memory";
> +		/* 16 GB RAM */
> +		reg = <0x00 0x80000000 0x00 0x80000000>,
> +		      <0x08 0x80000000 0x03 0x80000000>;
> +	};
> +
> +	/* Reserving memory regions still pending */

Is this comment needed?

> +	reserved_memory: reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		secure_ddr: optee@...00000 {
> +			reg = <0x00 0x9e800000 0x00 0x01800000>;
> +			alignment = <0x1000>;

Is alignment needed here?

Please see https://lore.kernel.org/lkml/cd5dbbb0-2d9f-8d7d-b051-f8d01d710c62@ti.com/

> +			no-map;
> +		};
> +	};
> +};

-- 
Regards,
Vaishnav