From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B345863B9; Mon, 13 Jul 2026 06:27:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783924027; cv=none; b=Voav6fSTD5jmGL+yHXHgXHqchwuT245IkEWIkka47gNyoUC6wfnYFSPrW3yqfB8hoXDAf2W9J0NoKyuXVlGX3eLsuqSk/1SqEa8utoyHBHYVuew84YIR6hKlxWpt0FEJRiolgrVn+Cd37lVIM8W2LNLjiKRn5sbDY2pS2YTLZD4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783924027; c=relaxed/simple; bh=B7OjmiraTpJiGItRI7tVkbOD0fmA509CxKxIDx1KxFU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lvo9WI2xZX6s8g3C1c+pfzhMKBM8ZyX6jvD7HEOC32aNOpW5K74ERw5We3a52Azdq2ZC6nCZ/RdI79v7QdwkLoWGHC0Q+OVqjDu3EBVwZbqZgtQN9gVfiR0tZMOfSQwutXCDL/zOfv2inq+gQy8ZpnHo3ZcO6MaUK5EzHngESoE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Tka99AQX; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Tka99AQX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 169A61F000E9; Mon, 13 Jul 2026 06:27:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783924026; bh=pImptldIHl5+8AWxqCqfjS2sSYB2Zs2oA3iRfqTWyBI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Tka99AQXx3i4K3jasBpkL1oilqzsgh/cTa22V1fcxvMIwK6/QkvhPXxYC1TWcxoF6 JNaEhNfVGB9OVf6hXDUuFWBRZa5vcuOW90un8JI6A1YBgC6MitWLcTahflkYWSsS2Z gEJjxWAgLBMVFe7cM8jvQ4oNoTSdlNbZ8p/c3j8o62wFQiWGkZa48dN2j1lpKH8QYZ fceVSB6mOhiqNzLH+CId24kbLIjLRCAKuGIHbBjarO7c1X5q9pcAoQdyye2eaahKjH CR1N3fYGXQcq5MeOyGcZuBe4uwPmYvyfw4ErzZ84RPgyHEbmXH+HdpJR0dq2y/FpBk Q4SmSO5amGlZA== Message-ID: Date: Mon, 13 Jul 2026 08:26:59 +0200 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/2] dt-bindings: qcom,snps-dwc3: Add property indicating presence of eUSB2 phy To: Thinh Nguyen Cc: Dmitry Baryshkov , Krishna Kurapati , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Wesley Cheng , "linux-arm-msm@vger.kernel.org" , "linux-usb@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <20260709-eusb2-interrupt-handling-v5-v4-0-d4f993925608@oss.qualcomm.com> <20260709-eusb2-interrupt-handling-v5-v4-1-d4f993925608@oss.qualcomm.com> <20260710-warping-resolute-wasp-e4b8ce@quoll> <7a099224-ea95-40ec-b279-f8834f261e23@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/07/2026 23:02, Thinh Nguyen wrote: > On Fri, Jul 10, 2026, Krzysztof Kozlowski wrote: >> On 10/07/2026 09:16, Krzysztof Kozlowski wrote: >>> On Fri, Jul 10, 2026 at 01:52:45AM +0000, Thinh Nguyen wrote: >>>> On Thu, Jul 09, 2026, Dmitry Baryshkov wrote: >>>>> On Thu, Jul 09, 2026 at 02:22:36PM +0530, Krishna Kurapati wrote: >>>>>> Add property "qcom,has-eusb2-phy" to indicate whether the SoC has eUSB2 phy >>>>>> or not. This is used to modify dp/dm interrupts during host mode suspend. >>>>>> >>>>>> Signed-off-by: Krishna Kurapati >>>>>> --- >>>>>> Documentation/devicetree/bindings/usb/qcom,snps-dwc3.yaml | 7 +++++++ >>>>>> 1 file changed, 7 insertions(+) >>>>>> >>>>>> diff --git a/Documentation/devicetree/bindings/usb/qcom,snps-dwc3.yaml b/Documentation/devicetree/bindings/usb/qcom,snps-dwc3.yaml >>>>>> index 8201656b41ed..0c6a839be82f 100644 >>>>>> --- a/Documentation/devicetree/bindings/usb/qcom,snps-dwc3.yaml >>>>>> +++ b/Documentation/devicetree/bindings/usb/qcom,snps-dwc3.yaml >>>>>> @@ -152,6 +152,13 @@ properties: >>>>>> HS/FS/LS modes are supported. >>>>>> type: boolean >>>>>> >>>>>> + qcom,has-eusb2-phy: >>>>>> + description: >>>>>> + If present, it indicates that the controller is working with eUSB2 >>>>>> + phy. This property is used to modify dp/dm interrupt configurations >>>>>> + while entering suspend. >>>>>> + type: boolean >>>>> >>>>> I still have exactly the same concern. This information is already >>>>> present in the DT. >>>>> >>>> >>>> Could you clarify what you mean by "this information is already present >>>> in the DT"? Are you suggesting we use the dwc3 node's compatible string >>>> to infer the phy type? >>>> >>>> The dwc3 glue compatible describes the controller, not the phy. They are >>>> separate IP blocks. A board variant could reuse the same dwc3 compatible >>>> with a different phy attached, making that inference silently wrong. >>>> >>>> The phy type is described somewhere else in the DT (in the phy node >>>> itself), referenced via the phy's phandle on the dwc3 core child node. >>>> We could walk that phandle and check whether the phy node's compatible >>>> contains "eusb2". However, that relies on a naming convention that isn't >>>> enforced anywhere. All current eusb2 phy compatibles happen to follow it >>>> (qcom,sm8550-snps-eusb2-phy, qcom,sm8750-m31-eusb2-phy, >>>> samsung,exynos2200-eusb2-phy, etc.), but a future phy driver could break >>> >>> You have a fixed/finite list of phys which needs something special, so >>> that information as Dmitry said is in DT already. > > Are you referring to a fixed list of eusb2 phy compatibles, or a fixed > list of dwc3 node compatibles? The phys. > > Either way, the list is not fixed. New eusb2 SoC variants are added > regularly, and there are already 12 eusb2 phy compatible strings in the It is fixed. You have 12 compatible strings, so it is strictly defined. > DT bindings but only 3 in the PHY driver of_match tables, they don't > land at the same time. As for what information is already in DT, I've > addressed this above and in my earlier response. > >>> >>> Anyway, the commit msg and property field have insufficient description >>> of actual hardware problem being represented by this property, so it >>> looks way too much as SW policy. > > That's fair feedback to raise with Krishna. > >> >> >> And Dmitry already said this at v3. > > And I've already responded to his comment in v3: > https://lore.kernel.org/linux-usb/ahjYwJtiMsm0BcCh@vbox/ It does not change the fact that type of phy is implied by compatible, thus you do not get a new property. Best regards, Krzysztof