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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 17DECC432C3 for ; Mon, 18 Nov 2019 15:55:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E211B21939 for ; Mon, 18 Nov 2019 15:55:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727433AbfKRPzr (ORCPT ); Mon, 18 Nov 2019 10:55:47 -0500 Received: from muru.com ([72.249.23.125]:42722 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727109AbfKRPzq (ORCPT ); Mon, 18 Nov 2019 10:55:46 -0500 Received: from atomide.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTPS id AC87E80BF; Mon, 18 Nov 2019 15:56:19 +0000 (UTC) Date: Mon, 18 Nov 2019 07:55:39 -0800 From: Tony Lindgren To: Geert Uytterhoeven Cc: Andreas =?utf-8?Q?F=C3=A4rber?= , Neil Armstrong , Greg Kroah-Hartman , Geert Uytterhoeven , linux-realtek-soc@lists.infradead.org, Linus Walleij , Bjorn Andersson , Thierry Reding , Lee Jones , Rob Herring , Kevin Hilman , "Rafael J. Wysocki" , Michal Simek , Jonathan Hunter , NXP Linux Team , Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= , boot-architecture@lists.linaro.org, Sascha Hauer , Fabio Estevam , "linux-tegra@vger.kernel.org" , "open list:ARM/Amlogic Meson..." , "open list:TI ETHERNET SWITCH DRIVER (CPSW)" , Alexander Sverdlin , Linux ARM , Linux Kernel Mailing List , Hartley Sweeten , Pengutronix Kernel Team , Shawn Guo Subject: Re: Sense of soc bus? (was: [PATCH] base: soc: Export soc_device_to_device() helper) Message-ID: <20191118155539.GB35479@atomide.com> References: <586fa37c-6292-aca4-fa7c-73064858afaf@suse.de> <20191111064040.GA3502217@kroah.com> <20191112052347.GA1197504@kroah.com> <20191112072926.isjxfa4ci6akhx56@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Geert Uytterhoeven [191115 15:51]: > On Fri, Nov 15, 2019 at 1:01 PM Andreas Färber wrote: > > Am 15.11.19 um 09:58 schrieb Geert Uytterhoeven: > > > We do our best to use it solely for detecting quirks in early SoC revisions. > > > > Got a pointer? I fail to immediately understand how sysfs would help > > drivers (as opposed to userspace) detect quirks: Parsing strings back > > doesn't sound efficient, and I don't see you exporting any custom APIs > > in drivers/soc/renesas/renesas-soc.c? > > We use soc_device_match(), inside kernel drivers. > Exposure through sysfs is a side-effect of using soc_device_register(), > and welcomed, as it allows the user to find out quickly which SoC and > revision is being used. For the omap variants too, we've so far gotten away with early SoC detection for platform code, and then use soc_device_match() in few cases for drivers at probe time if needed. Regards, Tony