From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 0E252346E7A; Fri, 2 Oct 2026 10:18:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790936340; cv=none; b=ak7hLehDaGS3AzcO5QO3QuojdqNmO7T4E24FGvJF84XIUX+XRiYsFza8ZkkiN3QC7RLaVIlWSb9vUfo+sqp+wKi/gQ/xOzLNtAVdF4vK1NHhsLfOYJ6BuHSDKojKqNyrc8O/EdVK0QA6fcz3AWrPh8RrR5+HiydDaxa269FQwzk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790936340; c=relaxed/simple; bh=TsMJ+4gNkWVqVswmgJ7yPSiNWVRV87vymlqaYEMCvlg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=L7DLBSpNLPCzWMw2WoPieuk0Tm/6aCxwze1wl49fkPCm6g0OiHJNz5i8zbnlqQUUDZIWtN91uKOW3z6/iZMXHUA2P4Q87bAtQwNWZynQZn8vnMKwEn/n2vRHW7wJ3jIJp9grMnUH6Y1KNDNw2x74pKfAMuBTHES3CmaUyqQFAlI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=n/+yI66M; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="n/+yI66M" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1790936339; x=1822472339; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=TsMJ+4gNkWVqVswmgJ7yPSiNWVRV87vymlqaYEMCvlg=; b=n/+yI66MM2aYcg6AZoYPUjgP+uZXsT70JXLMj/EhVJd4WsBeRGkLpvIg brppwZ78rGoPDfvupcY8BQN2hxaEfD8nqO6TNZSSXcie462rxPoak//eS CzoCUHxblw0XPBRB4cJJ5E+eabN9/61u636r82r0BHclWGVHn4I2+S/02 UhFToO3L8hSj+yECKmwvhFtvmFUeOFQDv/L3kGHytj6JvaB8V9GPy3RLb O3pQGHs5muwvc7gQBsboBdQ/F8tYtXOE60Mw0yDq1u3ICTyhSo3JHcm7j VBtiNewNKI9F1KMub/k2zrDvugGTQYyCWh40CwuIOx/cnrNH1oqryYRZM w==; X-CSE-ConnectionGUID: 6NwfLTv/TA2i30LiNmf/iQ== X-CSE-MsgGUID: 4WcfP5WRQN2F5X31LYjzLg== X-IronPort-AV: E=McAfee;i="6800,10657,11922"; a="109187567" X-IronPort-AV: E=Sophos;i="6.27,136,1787036400"; d="scan'208";a="109187567" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Oct 2026 03:18:58 -0700 X-CSE-ConnectionGUID: DWliCEhUSN6XooXqwkALjw== X-CSE-MsgGUID: SND71xBDTUiQxFGjurcIhw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,136,1787036400"; d="scan'208";a="275757817" Received: from conormcd-mobl2.ger.corp.intel.com (HELO localhost) ([10.245.244.188]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Oct 2026 03:18:56 -0700 Date: Fri, 2 Oct 2026 13:18:54 +0300 From: Andy Shevchenko To: Linus Walleij Cc: jiale yao <19888972804@163.com>, Mark Brown , linux-spi@vger.kernel.org, Biju Das , "linux-gpio@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: RE: Re:RE: [PATCH] pinctrl: mcp23s08: reject devices without match data Message-ID: References: <20260925133804.2231004-1-yaojiale02@163.com> <34472b57.1961.1a0dd3dff12.Coremail.19888972804@163.com> <1186ef64.63b1.1a0e6e70a59.Coremail.19888972804@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 On Fri, Oct 02, 2026 at 11:52:41AM +0200, Linus Walleij wrote: > On Fri, Oct 2, 2026 at 8:59 AM Andy Shevchenko > wrote: > > > I believe this is the whole design of driver_override like this... > > There is an attempt to allow drivers to forbid that feature. > > I guess I don't have the right background to understand > the driver_override feature, it feels someone should explain > its virtues to me because I feel I am getting really angry > at it and it may not deserve that. > > The entire name of the thing feels like debugfs-footgun > territory for example. Yeah, I can't find neither a thing on LWN.net nor in the in-tree documentation. The only useful piece of information is (in kernel-doc of struct bus_type): driver_override Set to true if this bus supports the driver_override mechanism, which allows userspace to force a specific driver to bind to a device via a sysfs attribute. -- With Best Regards, Andy Shevchenko