linux-kernel - Re: [PATCH 3/3] arm64: dts: Add phyBOARD-Pollux dts for rpmsg

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Message-ID: <ff922cad-0e0a-4ab7-981b-62ac60ff2d26@kernel.org>
Date: Fri, 26 Jul 2024 11:19:15 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yashwanth Varakala <y.varakala@...tec.de>, shawnguo@...nel.org,
 s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Cc: imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 upstream@...ts.phytec.de
Subject: Re: [PATCH 3/3] arm64: dts: Add phyBOARD-Pollux dts for rpmsg

On 25/07/2024 11:44, Yashwanth Varakala wrote:
> Adds a devicetree containing reserved memory regions used for intercore
> communication between A53 and M7 cores.
> 
> Signed-off-by: Yashwanth Varakala <y.varakala@...tec.de>
> ---
>  arch/arm64/boot/dts/freescale/Makefile        |  2 +
>  .../dts/freescale/imx8mp-phycore-rpmsg.dtso   | 57 +++++++++++++++++++
>  2 files changed, 59 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-phycore-rpmsg.dtso
> 
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index dedea4b5c319..80cc87d50301 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -177,9 +177,11 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-phyboard-pollux-rdk.dtb
>  imx8mp-phyboard-pollux-rdk-no-eth-dtbs += imx8mp-phyboard-pollux-rdk.dtb imx8mp-phycore-no-eth.dtbo
>  imx8mp-phyboard-pollux-rdk-no-rtc-dtbs += imx8mp-phyboard-pollux-rdk.dtb imx8mp-phycore-no-rtc.dtbo
>  imx8mp-phyboard-pollux-rdk-no-spiflash-dtbs += imx8mp-phyboard-pollux-rdk.dtb imx8mp-phycore-no-spiflash.dtbo
> +imx8mp-phyboard-pollux-rdk-rpmsg-dtbs += imx8mp-phyboard-pollux-rdk.dtb imx8mp-phycore-rpmsg.dtbo
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-phyboard-pollux-rdk-no-eth.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-phyboard-pollux-rdk-no-rtc.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-phyboard-pollux-rdk-no-spiflash.dtb
> +dtb-$(CONFIG_ARCH_MXC) += imx8mp-phyboard-pollux-rdk-rpmsg.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revb-hdmi.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revb-lt6.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revb-mi1010ait-1cp1.dtb
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-phycore-rpmsg.dtso b/arch/arm64/boot/dts/freescale/imx8mp-phycore-rpmsg.dtso
> new file mode 100644
> index 000000000000..a5694f3aecaa
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-phycore-rpmsg.dtso
> @@ -0,0 +1,57 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2024 PHYTEC Messtechnik GmbH
> + * Author: Dominik Haller <d.haller@...tec.de>
> + * 	   Cem Tenruh <c.tenruh@...tec.de>
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/clock/imx8mp-clock.h>
> +
> +&{/} {
> +	imx8mp-cm7 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +		compatible = "fsl,imx8mn-cm7";
> +		clocks = <&clk IMX8MP_CLK_M7_DIV>;
> +		mboxes = <&mu 0 1
> +			&mu 1 1
> +			&mu 3 1>;

That's one or there entries? look wrong.

> +		mbox-names = "tx", "rx", "rxdb";
> +		memory-region = <&vdevbuffer>, <&vdev0vring0>, <&vdev0vring1>, <&rsc_table>;
> +		rsc-da = <0x55000000>;
> +		status = "okay";

Why? Did you disable it anywhere? You add a new node.

> +	};
> +
> +	reserved-memory {
> +		ranges;
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +
> +		m7_reserved: m7@...0000000 {
> +			no-map;
> +			reg = <0 0x80000000 0 0x1000000>;
> +		};
> +
> +		rsc_table: rsc_table@...ff000 {

Please follow DTS coding style... This applies to all your contributions.

Best regards,
Krzysztof