linux-kernel - Re: [PATCH v7 4/4] arm64: dts: ti: hummingboard-t: add overlays for m.2 pci-e and usb-3

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Message-ID: <a65e17e9-0055-4e5a-902f-8ee2807a86df@ti.com>
Date: Mon, 28 Oct 2024 21:01:20 +0530
From: Vignesh Raghavendra <vigneshr@...com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
        Josua Mayer
	<josua@...id-run.com>
CC: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Yazan Shhady <yazan.shhady@...id-run.com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 4/4] arm64: dts: ti: hummingboard-t: add overlays for
 m.2 pci-e and usb-3



On 25/10/24 19:27, Geert Uytterhoeven wrote:
> Hi Josua,
> 
> On Mon, Feb 19, 2024 at 4:05 PM Josua Mayer <josua@...id-run.com> wrote:
>> HummingBoard-T features two M.2 connectors labeled "M1" and "M2".
>> The single SerDes lane of the SoC can be routed to either M1 pci-e
>> signals, or M2 usb-3 signals by a gpio-controlled mux.
>>
>> Add overlays for each configuration.
>>
>> Signed-off-by: Josua Mayer <josua@...id-run.com>
> 
> Thanks for your patch, which is now commit bbef42084cc170cb ("arm64:
> dts: ti: hummingboard-t: add overlays for m.2 pci-e and usb-3") in v6.9.
> 
>> --- /dev/null
>> +++ b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dtso
>> @@ -0,0 +1,44 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Copyright (C) 2023 Josua Mayer <josua@...id-run.com>
>> + *
>> + * Overlay for SolidRun AM642 HummingBoard-T to enable USB-3.1.
>> + */
>> +
>> +/dts-v1/;
>> +/plugin/;
>> +
>> +#include <dt-bindings/phy/phy.h>
>> +
>> +#include "k3-serdes.h"
>> +
>> +&serdes0 {
>> +       #address-cells = <1>;
>> +       #size-cells = <0>;
>> +
>> +       serdes0_link: phy@0 {
>> +               reg = <0>;
>> +               cdns,num-lanes = <1>;
>> +               cdns,phy-type = <PHY_TYPE_USB3>;
>> +               #phy-cells = <0>;
>> +               resets = <&serdes_wiz0 1>;
>> +       };
>> +};
>> +
>> +&serdes_ln_ctrl {
>> +       idle-states = <AM64_SERDES0_LANE0_USB>;
>> +};
>> +
>> +&serdes_mux {
>> +       idle-state = <0>;
>> +};
>> +
>> +&usbss0 {
>> +       /delete-property/ ti,usb2-only;
> 
> /delete-property/ (and /delete-node/) to delete something in the base DTS
> does not work.

Geert,

Thanks for the catching

Joshua,

This overlay is pretty useless in light of above issue.  I intend to
just drop this file unless you convince me otherwise?


-- 
Regards
Vignesh