linux-kernel - Re: [PATCH v5 5/6] arm64: dts: qcom: Add support for QCS9075 Ride & Ride-r3

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Message-ID: <tjrg5zqggupjo36udpyv3vynsij76f4qlus6lkbqotuimusqgq@hosmksp77sif>
Date: Mon, 30 Dec 2024 17:45:39 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Wasim Nazir <quic_wasimn@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel@...cinc.com
Subject: Re: [PATCH v5 5/6] arm64: dts: qcom: Add support for QCS9075 Ride &
 Ride-r3

On Sun, Dec 29, 2024 at 08:53:31PM +0530, Wasim Nazir wrote:
> Add device tree support for QCS9075 Ride & Ride-r3 boards.
> 
> QCS9075 lacks the safety monitoring features of Safety-Island (SAIL)
> subsystem which is available in QCS9100, and it affects thermal
> management.
> 
> Also, between ride and ride-r3 ethernet phy is different.
> Ride uses 1G ethernet phy while ride-r3 uses 2.5G ethernet phy.

Your board files duplicate sa8775p-ride-r3.dts and sa8775p-ride.dts, but
include them. Existing qcs9100-ride-r3.dts and qcs9100-ride-r3.dts just
include corresponding SA8775P files.

This is not ideal for the following reasons:
- The approach is not uniform (between QCS9100 and QCS9075), which might
  lead to mistakes.
- The approach ends up duplicating DT code unnecessarily, which can lead
  to issues being patches in the one board file, but not in the other
  file.

If there are any reasons why you want to follow this approach, they must
be a part of the commit message.

> 
> Signed-off-by: Wasim Nazir <quic_wasimn@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/Makefile            |  2 +
>  arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts | 46 ++++++++++++++++++++
>  arch/arm64/boot/dts/qcom/qcs9075-ride.dts    | 46 ++++++++++++++++++++
>  3 files changed, 94 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts
>  create mode 100644 arch/arm64/boot/dts/qcom/qcs9075-ride.dts
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index 78613a1bd34a..41cb2bbd3472 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -118,6 +118,8 @@ dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs8550-aim300-aiot.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs9075-rb8.dtb
> +dtb-$(CONFIG_ARCH_QCOM)	+= qcs9075-ride.dtb
> +dtb-$(CONFIG_ARCH_QCOM)	+= qcs9075-ride-r3.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride-r3.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= qdu1000-idp.dtb
> diff --git a/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts b/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts
> new file mode 100644
> index 000000000000..d9a8956d3a76
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/qcs9075-ride-r3.dts
> @@ -0,0 +1,46 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +/dts-v1/;
> +
> +#include "sa8775p-ride.dtsi"
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. QCS9075 Ride Rev3";
> +	compatible = "qcom,qcs9075-ride-r3", "qcom,qcs9075", "qcom,sa8775p";
> +};
> +
> +&ethernet0 {
> +	phy-mode = "2500base-x";
> +};
> +
> +&ethernet1 {
> +	phy-mode = "2500base-x";
> +};
> +
> +&mdio {
> +	compatible = "snps,dwmac-mdio";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	sgmii_phy0: phy@8 {
> +		compatible = "ethernet-phy-id31c3.1c33";
> +		reg = <0x8>;
> +		device_type = "ethernet-phy";
> +		interrupts-extended = <&tlmm 7 IRQ_TYPE_EDGE_FALLING>;
> +		reset-gpios = <&pmm8654au_2_gpios 8 GPIO_ACTIVE_LOW>;
> +		reset-assert-us = <11000>;
> +		reset-deassert-us = <70000>;
> +	};
> +
> +	sgmii_phy1: phy@0 {
> +		compatible = "ethernet-phy-id31c3.1c33";
> +		reg = <0x0>;
> +		device_type = "ethernet-phy";
> +		interrupts-extended = <&tlmm 26 IRQ_TYPE_EDGE_FALLING>;
> +		reset-gpios = <&pmm8654au_2_gpios 9 GPIO_ACTIVE_LOW>;
> +		reset-assert-us = <11000>;
> +		reset-deassert-us = <70000>;
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/qcom/qcs9075-ride.dts b/arch/arm64/boot/dts/qcom/qcs9075-ride.dts
> new file mode 100644
> index 000000000000..3b524359a72d
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/qcs9075-ride.dts
> @@ -0,0 +1,46 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +/dts-v1/;
> +
> +#include "sa8775p-ride.dtsi"
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. QCS9075 Ride";
> +	compatible = "qcom,qcs9075-ride", "qcom,qcs9075", "qcom,sa8775p";
> +};
> +
> +&ethernet0 {
> +	phy-mode = "sgmii";
> +};
> +
> +&ethernet1 {
> +	phy-mode = "sgmii";
> +};
> +
> +&mdio {
> +	compatible = "snps,dwmac-mdio";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	sgmii_phy0: phy@8 {
> +		compatible = "ethernet-phy-id0141.0dd4";
> +		reg = <0x8>;
> +		device_type = "ethernet-phy";
> +		interrupts-extended = <&tlmm 7 IRQ_TYPE_EDGE_FALLING>;
> +		reset-gpios = <&pmm8654au_2_gpios 8 GPIO_ACTIVE_LOW>;
> +		reset-assert-us = <11000>;
> +		reset-deassert-us = <70000>;
> +	};
> +
> +	sgmii_phy1: phy@a {
> +		compatible = "ethernet-phy-id0141.0dd4";
> +		reg = <0xa>;
> +		device_type = "ethernet-phy";
> +		interrupts-extended = <&tlmm 26 IRQ_TYPE_EDGE_FALLING>;
> +		reset-gpios = <&pmm8654au_2_gpios 9 GPIO_ACTIVE_LOW>;
> +		reset-assert-us = <11000>;
> +		reset-deassert-us = <70000>;
> +	};
> +};
> --
> 2.47.0
> 

-- 
With best wishes
Dmitry