From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from vps0.lunn.ch (vps0.lunn.ch [156.67.10.101]) (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 9D27B2D9EE2; Wed, 15 Oct 2025 16:37:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=156.67.10.101 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760546266; cv=none; b=fHR8IwDoILo406ag7ymWl1QRGESHG6pS1h1ipEBtEYSpiwN4SSXf9GASpcjxH1XtL/FrWdHBW/LRThHd9+r9R4BxcBst4w/MEELHgULZJZBF377+ZJ4VAQD0WI+ts1HLD0GMRYfOOGnKe5yCFrTDnTSW9UJEUJAA8TdWKVoJIK8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760546266; c=relaxed/simple; bh=W491iOp9uGj/rptkEeZN3ds/se5A4eyizGAeBjNEYD0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Zv+2xCqv/wOvX5yE8w5rL9kcwpdTTqcVVpc8t+gFMWV9Kmf6MkUKqWDawVAm+pkrDl8Sna0RnKbYszSxcNKXCGGIBZ08m20F4tL5ePAqIm8Mi5N+SMoRpYCqPMeaQ2WrwHrZaq7/6flvYrzfBx84TsJX2mQ7vgmyfhURXFaPF84= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch; spf=pass smtp.mailfrom=lunn.ch; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b=3p/AB+nX; arc=none smtp.client-ip=156.67.10.101 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lunn.ch Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lunn.ch Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="3p/AB+nX" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Disposition:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:From:Sender:Reply-To:Subject: Date:Message-ID:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Content-Disposition:In-Reply-To:References; bh=EmNyMES08hLl/lZo50ZMyOt0uk2s5aoOzzYmrsTy+X0=; b=3p/AB+nXcfar0/n95hcIl0eb3B sdzT8OKBtQ98To+XFs5Bbtrk+fIwpTM08JgleTkl1NPK6b6w6fZnN6c79KulRIU3jX4kegbCAct57 VfTnzyW73zdlmfO1jyJbP3T1oAejXdtoubxWxQpPgm9uFOmnvr7qRN9CgJHbKnhbzwAQ=; Received: from andrew by vps0.lunn.ch with local (Exim 4.94.2) (envelope-from ) id 1v94VJ-00B3LR-0W; Wed, 15 Oct 2025 18:37:33 +0200 Date: Wed, 15 Oct 2025 18:37:32 +0200 From: Andrew Lunn To: Linus Walleij Cc: Conor Dooley , Antonio Borneo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Bartosz Golaszewski , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Christophe Roullier , Fabien Dessenne , Valentin Caron Subject: Re: [PATCH v3 02/10] dt-bindings: pincfg-node: Add properties 'skew-delay-{in,out}put' Message-ID: References: <20251014140451.1009969-1-antonio.borneo@foss.st.com> <20251014140451.1009969-3-antonio.borneo@foss.st.com> <20251014-barbecue-crewman-717fe614daa6@spud> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: > I don't recall the reason for this way of defining things, but one reason > could be that the skew-delay incurred by two inverters is very > dependent on the production node of the silicon, and can be > nanoseconds or picoseconds, these days mostly picoseconds. > Example: Documentation/devicetree/bindings/net/adi,adin.yaml I'm missing the big picture here, and i don't see an example of these properties being used. However, since you reference an old networking example, for RGMII delays.... adi,rx-internal-delay-ps should be deprecated, we now have the generic rx-internal-delay-ps. The point about using -ps is however still valid. However, i would not like to see pinctl DT properties used in place of rx-internal-delay-ps. How the Ethernet MAC driver implements rx-internal-delay-ps is left open, so calling a pinctl API to set the skew is fine by me. And if the real use case has nothing to do with networking, then i don't care. Andrew