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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CD25C433F5 for ; Tue, 2 Nov 2021 18:37:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 045E761269 for ; Tue, 2 Nov 2021 18:37:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235150AbhKBSka (ORCPT ); Tue, 2 Nov 2021 14:40:30 -0400 Received: from fllv0016.ext.ti.com ([198.47.19.142]:37948 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235253AbhKBSkV (ORCPT ); Tue, 2 Nov 2021 14:40:21 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 1A2IbM7M087989; Tue, 2 Nov 2021 13:37:22 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1635878242; bh=kahu1RrAQ8a3NUn7pdiksp8ndZsSm/fSJHPMdl9Wqn4=; h=Subject:To:CC:References:From:Date:In-Reply-To; b=U0eNHkxK5PVYpVxJhoYzaZ8E/+nV0czPYsP+4M8rDZiUrcwYa5Fv8ylDS9zM58uzC x8q/CW5tMwpFUlR8ljCO3jr3evn63vETUj2c7o9qjwQ9goIXXQtsvcOAjIeM3LQeoJ f0ED8UomDgld6YMaDf+JzuzGCtSFW4lBix+GWviI= Received: from DFLE113.ent.ti.com (dfle113.ent.ti.com [10.64.6.34]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 1A2IbMMp050537 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 2 Nov 2021 13:37:22 -0500 Received: from DFLE101.ent.ti.com (10.64.6.22) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Tue, 2 Nov 2021 13:37:22 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Tue, 2 Nov 2021 13:37:21 -0500 Received: from [10.250.100.73] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 1A2IbJDf130527; Tue, 2 Nov 2021 13:37:20 -0500 Subject: Re: [RFC PATCH] net: phy/mdio: enable mmd indirect access through phy_mii_ioctl() To: "Russell King (Oracle)" CC: Andrew Lunn , "David S. Miller" , , Jakub Kicinski , Heiner Kallweit , Florian Fainelli , , Vignesh Raghavendra References: <20211101182859.24073-1-grygorii.strashko@ti.com> From: Grygorii Strashko Message-ID: Date: Tue, 2 Nov 2021 20:37:08 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Russell, Andrew, Thanks a lot for you comments. On 02/11/2021 19:41, Russell King (Oracle) wrote: > On Tue, Nov 02, 2021 at 07:19:46PM +0200, Grygorii Strashko wrote: >> It would require MDIO bus lock, which is not a solution, >> or some sort of batch processing, like for mmd: >> w reg1 val1 >> w reg2 val2 >> w reg1 val3 >> r reg2 >> >> What Kernel interface do you have in mind? > > That is roughly what I was thinking, but Andrew has basically said no > to it. > >> Sry, but I have to note that demand for this become terribly high, min two pings in months > > Feel free to continue demanding it, but it seems that at least two of > the phylib maintainers are in agreement that providing generic > emulation of C45 accesses in kernel space is just not going to happen. > not ready to give up. One more idea how about mdiobus_get_phy(), so we can search for PHY and if present try to use proper API phy_read/phy_write_mmd? -- Best regards, grygorii