From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: Use of pinctrl-single for external device over I2C Date: Wed, 24 Jun 2015 21:38:39 -0700 Message-ID: <20150625043838.GK4156@atomide.com> References: <55893B2C.1070800@linaro.org> <558A9CC7.6070409@linaro.org> <20150624133349.GI4156@atomide.com> <558AE478.2080802@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from muru.com ([72.249.23.125]:59601 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750953AbbFYEin (ORCPT ); Thu, 25 Jun 2015 00:38:43 -0400 Content-Disposition: inline In-Reply-To: <558AE478.2080802@linaro.org> Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: Vaibhav Hiremath 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 * 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. Regards, Tony From mboxrd@z Thu Jan 1 00:00:00 1970 From: tony@atomide.com (Tony Lindgren) Date: Wed, 24 Jun 2015 21:38:39 -0700 Subject: Use of pinctrl-single for external device over I2C In-Reply-To: <558AE478.2080802@linaro.org> References: <55893B2C.1070800@linaro.org> <558A9CC7.6070409@linaro.org> <20150624133349.GI4156@atomide.com> <558AE478.2080802@linaro.org> Message-ID: <20150625043838.GK4156@atomide.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * 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. Regards, Tony