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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 62627CA1009 for ; Wed, 3 Sep 2025 11:17:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=T31GhvMgDcDqa/8wxluLN+dNwm4mTxHX2BFlOQeV59E=; b=tQYCxokgcLFTARO5lV/yQJzJME HRUrgOTKctgJQ4jgoXk/i1N8nhoTAPmWvvjPrxer+W3GV5U0c2z6jnkiaDie72RghL+Z8vbSZxSrC 3KkEggJ1wbUXYsjUtDBBBpxYkYvjP7nbdQEgjHDvCvGZXeilzxfq/V0f91CcJq4cWV7E85n4AnhBE SWiRujkXV5SIFck2hGYqIfLorUVvaF3+IlTAAU3qkcCPmUbVmMXs8+Ir9mFlJA2DQ1TZ6bXRAQMIF gnn9md2dgaXS/Fh7E9So/OmqWCAGOUWMldkEsk9NAJzcRH427AE/GPeBlkeiSu4XDfG97AnryMqCx VbGby8Rg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1utlUs-00000006D8d-3xzW; Wed, 03 Sep 2025 11:17:50 +0000 Received: from mgamail.intel.com ([192.198.163.15]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1utkdf-000000065Ng-44HY; Wed, 03 Sep 2025 10:22:53 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1756894972; x=1788430972; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=hEddkyRBq0eYhs86EpYDI0PR1kM06ibMXa7C70wF0A8=; b=HggVaUDs6B5f0jjwnfhFSe8/Ze/5LEgjauNQ/5TUJY30DB18cimKRVkT +aNsLVgdW55iJaeiH7gtEgadiG+IjSN3n6xz20M2CsssdMiQ0/aLUtxlc vCgaGi1TB7AbGvlg6SgwfpuANKZ9vf3lKfLI1k8V6BsWuiC+kv095E8sM OZE3t4WV4l13e4hwEWIuf4Q+dVawdt66nXtB5qSekXcp5xPM5iX+QLm96 2DjXdKqLpo/pKvvgwFGszxCfBbhoaMEKEfjafZYOW9AEgzkvYZwBDfXy5 h97+mgrGnUqBdI38YP63yiC4Fl8T1uGjmG1zPyi6o60nqR/5is3wICIE3 g==; X-CSE-ConnectionGUID: Odia2/aFTpuG0+Qricx9Bg== X-CSE-MsgGUID: l2xcyZZeS6GpueNME6T+OQ== X-IronPort-AV: E=McAfee;i="6800,10657,11541"; a="59318114" X-IronPort-AV: E=Sophos;i="6.18,233,1751266800"; d="scan'208";a="59318114" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2025 03:22:50 -0700 X-CSE-ConnectionGUID: YTo0WasPQBSP1GD2jJB+Ig== X-CSE-MsgGUID: 5tCXY7/9Tha1Hp4Y6DZptQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,233,1751266800"; d="scan'208";a="195180921" Received: from smile.fi.intel.com ([10.237.72.52]) by fmviesa002.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2025 03:22:40 -0700 Received: from andy by smile.fi.intel.com with local (Exim 4.98.2) (envelope-from ) id 1utkdQ-0000000AxFa-1l46; Wed, 03 Sep 2025 13:22:36 +0300 Date: Wed, 3 Sep 2025 13:22:36 +0300 From: Andy Shevchenko To: Bartosz Golaszewski Cc: Andy Shevchenko , Linus Walleij , Bjorn Andersson , Konrad Dybcio , Alexey Klimov , Lorenzo Bianconi , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Paul Cercueil , Kees Cook , Andy Shevchenko , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Dong Aisheng , Fabio Estevam , Shawn Guo , Jacky Bai , Pengutronix Kernel Team , NXP S32 Linux Team , Sascha Hauer , Tony Lindgren , Haojian Zhuang , Geert Uytterhoeven , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Neil Armstrong , Mark Brown , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, imx@lists.linux.dev, linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Bartosz Golaszewski , Konrad Dybcio Subject: Re: [PATCH v7 16/16] pinctrl: qcom: make the pinmuxing strict Message-ID: References: <20250902-pinctrl-gpio-pinfuncs-v7-0-bb091daedc52@linaro.org> <20250902-pinctrl-gpio-pinfuncs-v7-16-bb091daedc52@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250903_032252_019514_BA31E234 X-CRM114-Status: GOOD ( 21.11 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Wed, Sep 03, 2025 at 09:33:34AM +0200, Bartosz Golaszewski wrote: > On Tue, Sep 2, 2025 at 10:46 PM Andy Shevchenko > wrote: > > On Tue, Sep 2, 2025 at 8:42 PM Bartosz Golaszewski wrote: > > > On Tue, Sep 2, 2025 at 4:38 PM Andy Shevchenko > > > wrote: > > > > On Tue, Sep 02, 2025 at 01:59:25PM +0200, Bartosz Golaszewski wrote: ... > > > > > The strict flag in struct pinmux_ops disallows the usage of the same pin > > > > > as a GPIO and for another function. Without it, a rouge user-space > > > > > process with enough privileges (or even a buggy driver) can request a > > > > > used pin as GPIO and drive it, potentially confusing devices or even > > > > > crashing the system. Set it globally for all pinctrl-msm users. > > > > > > > > How does this keep (or allow) I²C generic recovery mechanism to work? > > Anyway, what is your point? I don't think it has any impact on this. If we have a group of pins that are marked as I²C, and we want to use recovery via GPIOs, would it be still possible to request as GPIO when controller driver is in the strict mode? -- With Best Regards, Andy Shevchenko