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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 CDE78C433B4 for ; Mon, 19 Apr 2021 10:07:21 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id ABAAE60E0B for ; Mon, 19 Apr 2021 10:07:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ABAAE60E0B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=atmark-techno.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FP2YM17RGz3c4Q for ; Mon, 19 Apr 2021 20:07:19 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=atmark-techno.com (client-ip=13.115.124.170; helo=gw.atmark-techno.com; envelope-from=dominique.martinet@atmark-techno.com; receiver=) Received: from gw.atmark-techno.com (gw.atmark-techno.com [13.115.124.170]) by lists.ozlabs.org (Postfix) with ESMTP id 4FP1q763Tmz2y6B for ; Mon, 19 Apr 2021 19:34:11 +1000 (AEST) Received: from mail-io1-f72.google.com (mail-io1-f72.google.com [209.85.166.72]) by gw.atmark-techno.com (Postfix) with ESMTPS id 63129804C6 for ; Mon, 19 Apr 2021 18:34:09 +0900 (JST) Received: by mail-io1-f72.google.com with SMTP id p8-20020a5d9c880000b02903dc877cd48dso9226191iop.13 for ; Mon, 19 Apr 2021 02:34:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=f9v+Sm8mKFEbQyXi/sN2tJHr2LOa9v0CsJoz/H5l6cU=; b=pAXG6d8Ogyl4+zxNqDsdX9dAndhrJ4zThNQcqTxYs2wz+1d9Wg1Zvi79+g/jAizVsb QfHBre6/BPLIHIwZj+Rxb/rZIlgIehSxeOcbF/JJxm6u6KmBTh+3vIB+EnTJ5jeJ29P5 b3zNQ60MSCyZwIPqXKCR3CP2F6P1QrvMKbsD6UFwkuNnXcCOFuSUr31/1jwiEQ1tmSZ5 zz61leRHsYVtKQIWQcK3jNymIYn+w9rxsbqSTfYI+he/bYYCD9959/uvvWyT0xdmL5Xi 48yQBqz6aV6GyG/Rq6OwbzbjhCjf1/kL5xZjqWpXnruduSM30M/mFVNFfqrKIDSYwUwg 2KBA== X-Gm-Message-State: AOAM530TCaKMHv0psKpjLkw6w+IFDj3bDYHH51JtyxsBIyf8o4Amh4u4 KDraRXQzACNGeZbX+JlP/pkm5y3errWkS2tbRZFfhfKBa4LuuaK5DLxaoS41htvy1vlNofD6f6S 4eaam5KvTNuxlilCWhFMo60O2B3o4dQ== X-Received: by 2002:a63:1665:: with SMTP id 37mr11208882pgw.31.1618824837068; Mon, 19 Apr 2021 02:33:57 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw3BVfHB/Iu3InVzb+YLUkuY7/BfcYMlC0sOGsbJiks+G4SQp5aPsproxuobb7vRE8Qif9k+g== X-Received: by 2002:a63:1665:: with SMTP id 37mr11208853pgw.31.1618824836841; Mon, 19 Apr 2021 02:33:56 -0700 (PDT) Received: from pc-0115 (103.131.189.35.bc.googleusercontent.com. [35.189.131.103]) by smtp.gmail.com with ESMTPSA id x18sm10982637pjn.51.2021.04.19.02.33.56 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 19 Apr 2021 02:33:56 -0700 (PDT) Received: from martinet by pc-0115 with local (Exim 4.94) (envelope-from ) id 1lYQHy-002k7D-3h; Mon, 19 Apr 2021 18:33:54 +0900 Date: Mon, 19 Apr 2021 18:33:44 +0900 From: Dominique MARTINET To: Geert Uytterhoeven Subject: Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match Message-ID: References: <20210419042722.27554-1-alice.guo@oss.nxp.com> <20210419042722.27554-4-alice.guo@oss.nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Mailman-Approved-At: Mon, 19 Apr 2021 20:06:58 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ulf.hansson@linaro.org, aymen.sghaier@nxp.com, geert+renesas@glider.be, rafael@kernel.org, airlied@linux.ie, mturquette@baylibre.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, a.hajda@samsung.com, netdev@vger.kernel.org, linux-phy@lists.infradead.org, peter.ujfalusi@gmail.com, linux-clk@vger.kernel.org, linux-renesas-soc@vger.kernel.org, wim@linux-watchdog.org, herbert@gondor.apana.org.au, horia.geanta@nxp.com, khilman@baylibre.com, joro@8bytes.org, narmstrong@baylibre.com, linux-staging@lists.linux.dev, iommu@lists.linux-foundation.org, kishon@ti.com, tony@atomide.com, linux-omap@vger.kernel.org, stern@rowland.harvard.edu, kuba@kernel.org, linus.walleij@linaro.org, linux@roeck-us.net, linux-media@vger.kernel.org, linux-watchdog@vger.kernel.org, will@kernel.org, linux-pm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, edubezval@gmail.com, linux-gpio@vger.kernel.org, linux-mediatek@lists.infradead.org, ssantosh@kernel.org, matthias.bgg@gmail.com, linux-amlogic@lists.infradead.org, mchehab@kernel.org, linux-arm-kernel@lists.infradead.org, "Alice Guo \(OSS\)" , balbi@kernel.org, tomba@kernel.org, sboyd@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-mmc@vger.kernel.org, adrian.hunter@intel.com, robert.foss@linaro.org, leoyang.li@nxp.com, linux@prisktech.co.nz, vkoul@kernel.org, Arnd Bergmann , linux-crypto@vger.kernel.org, daniel@ffwll.ch, j-keerthy@ti.com, dmaengine@vger.kernel.org, Roy.Pledge@nxp.com, jyri.sarha@iki.fi, davem@davemloft.net Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Geert Uytterhoeven wrote on Mon, Apr 19, 2021 at 11:03:24AM +0200: > > This is going to need quite some more work to be acceptable, in my > > opinion, but I think it should be possible. > > In general, this is very hard to do, IMHO. Some drivers may be used on > multiple platforms, some of them registering an SoC device, some of > them not registering an SoC device. So there is no way to know the > difference between "SoC device not registered, intentionally", and > "SoC device not yet registered". Hm, good point, I was probably a bit too optimistic if there are devices which don't register any soc yet have drivers which want one; I don't see how to make the difference indeed... And that does mean we can't just defer all the time. > soc_device_match() should only be used as a last resort, to identify > systems that cannot be identified otherwise. Typically this is used for > quirks, which should only be enabled on a very specific subset of > systems. IMHO such systems should make sure soc_device_match() > is available early, by registering their SoC device early. I definitely agree there, my suggestion to defer was only because I know of no other way to influence the ordering of drivers loading reliably and gave up on soc being init'd early. In this particular case the problem is that since 7d981405d0fd ("soc: imx8m: change to use platform driver") the soc probe tries to use the nvmem driver for ocotp fuses for imx8m devices, which isn't ready yet. So soc loading gets pushed back to the end of the list because it gets defered and other drivers relying on soc_device_match get confused because they wrongly think a device doesn't match a quirk when it actually does. If there is a way to ensure the nvmem driver gets loaded before the soc, that would also solve the problem nicely, and avoid the need to mess with all the ~50 drivers which use it. Is there a way to control in what order drivers get loaded? Something in the dtb perhaps? Thanks, -- Dominique