linux-kernel - Re: [PATCH] arm64: dts: ti: k3-j722s: Disable ethernet ports by default

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Message-ID: <20240402161306.tkg35heqlwqxoaua@another>
Date: Tue, 2 Apr 2024 11:13:06 -0500
From: Nishanth Menon <nm@...com>
To: Michael Walle <mwalle@...nel.org>
CC: Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: ti: k3-j722s: Disable ethernet ports by
 default

On 17:18-20240402, Michael Walle wrote:
> Device tree best practice is to disable any external interface in the
> dtsi and just enable them if needed in the device tree. Thus, disable
> both ethernet ports by default and just enable the one used by the EVM
> in its device tree.
> 
> There is no functional change.
> 
> Signed-off-by: Michael Walle <mwalle@...nel.org>
> ---
> This should also be true for all the other SoCs. But I don't wanted to
> touch all the (older) device trees. j722s is pretty new, so there we
> should get it right.
> ---
>  arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 5 +----
>  arch/arm64/boot/dts/ti/k3-j722s.dtsi    | 8 ++++++++
>  2 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> index d045dc7dde0c..afe7f68e6a4b 100644
> --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> @@ -224,14 +224,11 @@ cpsw3g_phy0: ethernet-phy@0 {
>  };
>  
>  &cpsw_port1 {
> +	status = "okay";
>  	phy-mode = "rgmii-rxid";
>  	phy-handle = <&cpsw3g_phy0>;
>  };
>  
> -&cpsw_port2 {
> -	status = "disabled";
> -};
> -
>  &main_gpio1 {
>  	status = "okay";
>  };
> diff --git a/arch/arm64/boot/dts/ti/k3-j722s.dtsi b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
> index c75744edb143..d0451e6e7496 100644
> --- a/arch/arm64/boot/dts/ti/k3-j722s.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
> @@ -83,6 +83,14 @@ &inta_main_dmss {
>  	ti,interrupt-ranges = <7 71 21>;
>  };
>  
> +&cpsw_port1 {
> +	status = "disabled";
> +};
> +
> +&cpsw_port2 {
> +	status = "disabled";
> +};
> +
>  &oc_sram {
>  	reg = <0x00 0x70000000 0x00 0x40000>;
>  	ranges = <0x00 0x00 0x70000000 0x40000>;
> -- 
> 2.39.2
> 

Meant to respond to this thread:

This is better at arch/arm64/boot/dts/ti/k3-am62p-main.dtsi.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D