Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753365AbaFCLSS (ORCPT ); Tue, 3 Jun 2014 07:18:18 -0400 Received: from mail-ob0-f182.google.com ([209.85.214.182]:64250 "EHLO mail-ob0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752013AbaFCLSQ (ORCPT ); Tue, 3 Jun 2014 07:18:16 -0400 MIME-Version: 1.0 In-Reply-To: <538C8A59.2070907@gmx.de> References: <1401452797-29521-1-git-send-email-lee.jones@linaro.org> <1401452797-29521-2-git-send-email-lee.jones@linaro.org> <20140530123656.GC2742@katana> <20140530133405.GB29731@lee--X1> <20140530174800.GA4917@katana> <20140530192516.GA4319@lee--X1> <20140531134805.GA3287@katana> <538C8A59.2070907@gmx.de> Date: Tue, 3 Jun 2014 13:18:15 +0200 Message-ID: Subject: Re: [PATCH] i2c: Make I2C ID tables non-mandatory for DT'ed and/or ACPI'ed devices From: Linus Walleij To: Michael Lawnick Cc: Wolfram Sang , Grant Likely , Lee Jones , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-i2c@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 2, 2014 at 4:29 PM, Michael Lawnick wrote: > Am 02.06.2014 14:16, schrieb Linus Walleij: >> Is this really so useful on embedded systems? >> >> I was under the impression that this method was something used >> on say PC desktops with temperature monitors and EEPROMs >> on some I2C link on the PCB, usage entirely optional and fun >> for userspace hacks. >> > We use it for dynamic instantiating whole subsystems with multiplexers, > sensors, controllers in an embedded system. The device list is taken from an > I2C eeprom which gets read on hotplug. Does this mean that you have stored the names (strings) that are used by the Linux kernel for identifying the devices into your EEPROM? That means that you have made the kernel-internal device driver names an ABI which is unfortunate :-/ This is one of the reasons to why we insist on device tree: OS neutral hardware description. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/