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SubjectRe: [RESEND PATCH V3 2/3] arm64: dts: ti: Add initial support for AM68 SK System on Module
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Hi Sinthu,

On 10/01/23 16:30, Sinthu Raja wrote:
> From: Sinthu Raja <sinthu.raja@ti.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@ti.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@80000000 {
> + 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@9e800000 {
> + 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

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