From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A2C4E2DA77F; Fri, 13 Jun 2025 08:47:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749804427; cv=none; b=eTSOo4ahG8m9q4P8e93jQdcc7qvwkDx9p/s+WTYuwT762oYGvojeFlE2Gk0hyAmCJsyDAlpkMDNKrKG+VKOJKsbEIhuTS7RtKi/AVcG/2WhX8g9PMwoilluvsIE8LKjy/+V5dSYfXJsBwKokrUCLK7Qr6XI5uXMSUdseRxP3WG4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749804427; c=relaxed/simple; bh=TVfUz3TKxC1BulEkZPvwIfSVjGBZCx6+Ief0xmyFK5E=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=sgHjGtGd+wmhZIn3orvN6FQS8gK9bMzd7MADbBoVn9SQKALc4O0/M74hbJKLCEAw9p8RmGLUzu4rwFocQdRkaK15HgxStLqV8j6GUc/MNMDTDF6HWGdVI4DeYUOnQK4BlVASvt8iP+LJT1/e5hMasvq2iuqR7stsufrx4Fr2aos= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i9HSB70U; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="i9HSB70U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1BF8C4CEE3; Fri, 13 Jun 2025 08:47:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749804427; bh=TVfUz3TKxC1BulEkZPvwIfSVjGBZCx6+Ief0xmyFK5E=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=i9HSB70U4KbfMCeMnJShysgjVY5llfhYZcqFMTPNS77p9z8cfcWNGWjQ/WYuHj3M4 phPqq8RGk7Tbo+VQ3W//Lz25/mwP7Z1BZeLGwcF4GHOjCsWToCdjZvMdU2YtR6VJze QkWgdyBlb3NkcogbZWI6ALnCwofbcXAC8t3Xzkb9RIxVCY8eDWSpGOYJZI18tzNQ4/ 1KTt5AZxywmGOgcMYuMPKK0Q4RXf2oYo5BuOuaJ0s2u1Y8DRni2arpIVAwHMvXCO9n Q1RMcZ1t9vvwkGxEEQwOcnAw5tLyLCVn1RaToD5p5Flo1O5fdytJpHPHIvI1t5GKmA Tjep0DgaWVDkQ== Message-ID: Date: Fri, 13 Jun 2025 10:47:03 +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] dt-bindings: usb: microchip,usb5744: Add support for configurable board reset delays To: Radhey Shyam Pandey , gregkh@linuxfoundation.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, michal.simek@amd.com Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, git@amd.com References: <1749148171-1729610-1-git-send-email-radhey.shyam.pandey@amd.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 05/06/2025 20:29, Radhey Shyam Pandey wrote: > Introduce 'reset-delay-us' and 'power-on-delay-us' properties. Default > delays in datasheet are not good enough for Xilinx Kria KR260 Robotics > Starter Kit (and others) so there is a need to program board specific > reset and power on delay via DT. > > Signed-off-by: Radhey Shyam Pandey > --- > Taken reference from mdio.yaml[1] > [1]: Documentation/devicetree/bindings/net/mdio.yaml > --- > .../devicetree/bindings/usb/microchip,usb5744.yaml | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml b/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml > index c68c04da3399..94a2bebd32da 100644 > --- a/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml > +++ b/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml > @@ -52,6 +52,16 @@ properties: > description: > phandle of an usb hub connected via i2c bus. > > + reset-delay-us: > + description: > + RESET pulse width in microseconds. I don't understand - there is no user for this in USB. Why do we need an ABI if no one ever uses it (and commit msg should clearly explain that)? > + > + power-on-delay-us: No user here, either. Plus I just wonder if you are mixing here RC delays or regulator ramp delays, because datasheet does not mention any delay. Can you point me to datasheet page explaining these delays? Best regards, Krzysztof