From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BBF91C55185 for ; Thu, 23 Apr 2020 02:39:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D3AA20747 for ; Thu, 23 Apr 2020 02:39:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726576AbgDWCjI (ORCPT ); Wed, 22 Apr 2020 22:39:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726271AbgDWCjI (ORCPT ); Wed, 22 Apr 2020 22:39:08 -0400 Received: from shards.monkeyblade.net (shards.monkeyblade.net [IPv6:2620:137:e000::1:9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 706FCC03C1AB; Wed, 22 Apr 2020 19:39:08 -0700 (PDT) Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id A1880127AD655; Wed, 22 Apr 2020 19:39:07 -0700 (PDT) Date: Wed, 22 Apr 2020 19:39:07 -0700 (PDT) Message-Id: <20200422.193907.1128604166633852958.davem@davemloft.net> To: o.rempel@pengutronix.de Cc: andrew@lunn.ch, f.fainelli@gmail.com, hkallweit1@gmail.com, david@protonic.nl, kernel@pengutronix.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, philippe.schenker@toradex.com, linux@armlinux.org.uk Subject: Re: [PATCH net-next v3] net: phy: micrel: add phy-mode support for the KSZ9031 PHY From: David Miller In-Reply-To: <20200422072137.8517-1-o.rempel@pengutronix.de> References: <20200422072137.8517-1-o.rempel@pengutronix.de> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Wed, 22 Apr 2020 19:39:08 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oleksij Rempel Date: Wed, 22 Apr 2020 09:21:37 +0200 > Add support for following phy-modes: rgmii, rgmii-id, rgmii-txid, rgmii-rxid. > > This PHY has an internal RX delay of 1.2ns and no delay for TX. > > The pad skew registers allow to set the total TX delay to max 1.38ns and > the total RX delay to max of 2.58ns (configurable 1.38ns + build in > 1.2ns) and a minimal delay of 0ns. > > According to the RGMII v1.3 specification the delay provided by PCB traces > should be between 1.5ns and 2.0ns. The RGMII v2.0 allows to provide this > delay by MAC or PHY. So, we configure this PHY to the best values we can > get by this HW: TX delay to 1.38ns (max supported value) and RX delay to > 1.80ns (best calculated delay) > > The phy-modes can still be fine tuned/overwritten by *-skew-ps > device tree properties described in: > Documentation/devicetree/bindings/net/micrel-ksz90x1.txt > > Signed-off-by: Oleksij Rempel Applied, thank you.