From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vaibhav Hiremath Subject: Re: Use of pinctrl-single for external device over I2C Date: Thu, 25 Jun 2015 11:16:50 +0530 Message-ID: <558B95CA.9070105@linaro.org> References: <55893B2C.1070800@linaro.org> <558A9CC7.6070409@linaro.org> <20150624133349.GI4156@atomide.com> <558AE478.2080802@linaro.org> <20150625043838.GK4156@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pd0-f175.google.com ([209.85.192.175]:35793 "EHLO mail-pd0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750966AbbFYFq5 (ORCPT ); Thu, 25 Jun 2015 01:46:57 -0400 Received: by pdbci14 with SMTP id ci14so45909576pdb.2 for ; Wed, 24 Jun 2015 22:46:57 -0700 (PDT) In-Reply-To: <20150625043838.GK4156@atomide.com> Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: Tony Lindgren Cc: Linus Walleij , lee.jones@linaro.org, sameo@linux.intel.com, linux-gpio@vger.kernel.org, "linux-arm-kernel@lists.infradead.org" , linux-kernel@vger.kernel.org On Thursday 25 June 2015 10:08 AM, Tony Lindgren wrote: > * Vaibhav Hiremath [150624 10:12]: >> >> I do not like this, as this is not HW feature, so DT may not be right >> approach. >> >> So I will dig more from either runtime or Compile time option to use >> regmap_ Vs raw read/writes. > > Can't you just check if the pinctrl node has compatible = "syscon" > property? > > A compile time option won't work for sure. I don't know what you > would check at runtime as you do not know what the bus is behind > syscon. > Although, I haven't gone through syscon, but not sure whether syscon would be useful. As you rightly stated, we need to know the bus behind regmap. Thanks, Vaibhav