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 93CA61D3634; Tue, 8 Oct 2024 12:10:15 +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=1728389415; cv=none; b=sG/2uR6LQYG0rR1IGbePHAZoT7NHx4Y1l6xyudBi1lNJwP7kVdJ1kO5hKCYpN2oGL8ytfbQu7pVLciWpRIJSbcVzroEQVK9S3WSgSqNxdGSotFlm6yaQFy9CMF8TTG0509oQ+H0Scb1h4t3kop4w1tHzQvCt0Z0l8FxRuUBpKhM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728389415; c=relaxed/simple; bh=mo127ua1cWhz/w9BxafIyoNPyY7spY1wZpdZB5iAqjU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WIMZGCvF1fBy6Mi+qIpz6IUHMxj1yrJtYGbeMR0lw+ckvHtjs1hi+y3l7sCldn0Q4g5oJUt9HMdyST5BdcN871spRWBOpM7BeazSJohRqYa3vWQa681+Vc/tJaIMDXZ4PFqH057r4/PMHDP8AgL4bY5ipvpdaqCALccRzDHUMOU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jZEHm+Ca; 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="jZEHm+Ca" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58C91C4CEC7; Tue, 8 Oct 2024 12:10:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728389415; bh=mo127ua1cWhz/w9BxafIyoNPyY7spY1wZpdZB5iAqjU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=jZEHm+Ca/C0XNISp++O+GnWrj2DzE8tXVP56xeGmAy6R+LomA2QJXXxqRho2aXD4u r5qEbufH9czvbEV+w0bBwQ/bA55L4uOk4ODSjA8elXNxXTEIm4SubB6FiZh7PPLUy9 +OlW0b4XmoEcCIxwU1xE4FxvBJOFVdZ++fXBLucZPIvvpjM8LNtOoJ25UyTFtdY67z QnkhQrzqIMqoolc57OUO6NUisJVc6G0bZhPtn41RtFywPWD4xRDmTJie7ot0F2kav9 U5Es7FGNQ59Iy3tn7CHevvE/MkE3OjO/edplp/eYEqorbZJR6+Ec17BdMPRqX5q18o NHdW19J0M2sjQ== Message-ID: <502d7a1f-0bac-496f-8fbe-b8924cd0ce31@kernel.org> Date: Tue, 8 Oct 2024 14:10:08 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: usb: dwc3: Add binding for USB Gen2 de-emphasis To: Joy Chakraborty Cc: Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thinh Nguyen , Felipe Balbi , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20241007135508.3143756-1-joychakr@google.com> <20241007135508.3143756-2-joychakr@google.com> <1bc2c476-9d7b-4c87-924b-ecaed0f721de@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 08/10/2024 13:59, Joy Chakraborty wrote: >>> >>>> >>>>> + description: When set core will set Tx de-emphasis for USB Gen2 >>>> >>>> And why it cannot be implied by compatible? >>> >>> As per my understanding these are tuning coefficients for de-emphasis >>> particular to a platform and not the dwc3 controller, hence should not >>> be a controller compatible. >> >> Platforms must have specific compatible, so this should be implied by >> compatible. > > Maybe I am using the word "platform" incorrectly here, what I > understand is that the same controller(in a chip) when used on 2 > different physical form factors might need different deemphasis You mean boards? This is board-level property? > coefficient values to be passed to its Phy. Someone could correct me > from the USB link stand point if I am mistaken here. > Then please point me to the upstream DTS boards using these properties. Lore link is enough, if board or DTS change is being upstreamed. Best regards, Krzysztof