linux-kernel - Re: [PATCH v2] arm64: dts: ti: k3-am64* Disable ethernet by default at SoC level

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Message-ID: <6fa4f5e5-7f7b-495a-a95a-82d7b105d2d7@utexas.edu>
Date: Mon, 26 Aug 2024 16:17:07 -0500
From: Logan Bristol <logan.bristol@...xas.edu>
To: Daniel Schultz <d.schultz@...tec.de>
Cc: Josua Mayer <josua@...id-run.com>, Wadim Egorov <w.egorov@...tec.de>,
 linux@...tq-group.com, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Vignesh Raghavendra <vigneshr@...com>,
 Nishanth Menon <nm@...com>
Subject: Re: [PATCH v2] arm64: dts: ti: k3-am64* Disable ethernet by default
 at SoC level

Hi Daniel,

On 8/26/2024 12:29 AM, Daniel Schultz wrote:
> Hey Logan,
> 
> my feedback is similar to Josua's.
> 
> On 09.08.24 15:57, Logan Bristol wrote:
>> External interfaces should be disabled at the SoC DTSI level, since
>> the node is incomplete. Disable Ethernet switch and ports in SoC DTSI
>> and enable them in the board DTS. If the board DTS includes a SoM DTSI
>> that completes the node description, enable the Ethernet switch and ports
>> in SoM DTSI.
>>
>> Reflect this change in SoM DTSIs by removing ethernet port disable.
>>
>> Signed-off-by: Logan Bristol <logan.bristol@...xas.edu>
>> ---
>> Changes since v1:
>> - Enabled cpsw3g and cpsw_port1 in SoM DTSI instead of board DTS
>> if board DTS included SoM DTSI
>> ---
>>   arch/arm64/boot/dts/ti/k3-am64-main.dtsi               | 3 +++
>>   arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi        | 6 ++----
>>   arch/arm64/boot/dts/ti/k3-am642-evm.dts                | 3 +++
>>   arch/arm64/boot/dts/ti/k3-am642-sk.dts                 | 3 +++
>>   arch/arm64/boot/dts/ti/k3-am642-sr-som.dtsi            | 6 ++----
>>   arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts | 6 ++----
>>   6 files changed, 15 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/ 
>> boot/dts/ti/k3-am64-main.dtsi
>> index f8370dd03350..69c5af58b727 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> @@ -677,6 +677,7 @@ cpsw3g: ethernet@...0000 {
>>           assigned-clock-parents = <&k3_clks 13 9>;
>>           clock-names = "fck";
>>           power-domains = <&k3_pds 13 TI_SCI_PD_EXCLUSIVE>;
>> +        status = "disabled";
>>           dmas = <&main_pktdma 0xC500 15>,
>>                  <&main_pktdma 0xC501 15>,
>> @@ -701,6 +702,7 @@ cpsw_port1: port@1 {
>>                   phys = <&phy_gmii_sel 1>;
>>                   mac-address = [00 00 00 00 00 00];
>>                   ti,syscon-efuse = <&main_conf 0x200>;
>> +                status = "disabled";
>>               };
>>               cpsw_port2: port@2 {
>> @@ -709,6 +711,7 @@ cpsw_port2: port@2 {
>>                   label = "port2";
>>                   phys = <&phy_gmii_sel 2>;
>>                   mac-address = [00 00 00 00 00 00];
>> +                status = "disabled";
>>               };
>>           };
>> diff --git a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi b/arch/ 
>> arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
>> index ea7c58fb67e2..6bece2fb4e95 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-am64-phycore-som.dtsi
>> @@ -185,6 +185,7 @@ AM64X_IOPAD(0x0278, PIN_INPUT, 7)    /* (C19) 
>> EXTINTn.GPIO1_70 */
>>   &cpsw3g {
>>       pinctrl-names = "default";
>>       pinctrl-0 = <&cpsw_rgmii1_pins_default>;
>> +    status = "okay";
>>   };
>>   &cpsw3g_mdio {
>> @@ -208,10 +209,7 @@ cpsw3g_phy1: ethernet-phy@1 {
>>   &cpsw_port1 {
>>       phy-mode = "rgmii-rxid";
>>       phy-handle = <&cpsw3g_phy1>;
> The connected phy is located on the SOM and should be enabled by default.
>> -};
>> -
>> -&cpsw_port2 {
>> -    status = "disabled";
>> +    status = "okay";
>>   };
> 
> This port is routed to the carrier-board. Please drop this node.

I replied similarly to Josua's comments, but if cpsw_port1 is to be 
enabled and cpsw_port2 should be dropped from this DTSI, isn't that 
shown in this diff?

Thank you,
Logan Bristol