Re: [PATCH 06/13] arm64: dts: qcom: correct DWC3 node names and unit addresses

From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Andy Gross <agross@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Manu Gautam <mgautam@codeaurora.org>,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH 06/13] arm64: dts: qcom: correct DWC3 node names and unit addresses
Date: Wed, 29 Jun 2022 22:30:23 -0500	[thread overview]
Message-ID: <Yr0Yz7UATt0aqvL1@builder.lan> (raw)
In-Reply-To: <20220504131923.214367-7-krzysztof.kozlowski@linaro.org>

On Wed 04 May 08:19 CDT 2022, Krzysztof Kozlowski wrote:
[..]
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 692cf4be4eef..6af80a627c3a 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -3868,7 +3868,7 @@ usb_1: usb@a6f8800 {
>  					<&gladiator_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_USB3_0 0>;
>  			interconnect-names = "usb-ddr", "apps-usb";
>  
> -			usb_1_dwc3: dwc3@a600000 {
> +			usb_1_dwc3: usb@a600000 {

Linux uses the dev_name() when identifying each of these controllers in
/sys/class/UDC, as such changing the name here will break existing USB
ConfigFS Gadget users.

We had this fixed for a while, but where forced to revert it.

So I think, in order for us to merge this without breaking AOSP, we'd
need to come up with a way to retain the old UDC name (perhaps a label
property?)

Regards,
Bjorn