From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oleksij Rempel Subject: Re: [PATCH v1 1/1] gpio: of: provide option generic property for initial line states Date: Sun, 11 Jun 2017 08:19:19 +0200 Message-ID: <20170611061919.jsbc7x67ut4segj5@pengutronix.de> References: <20170609141622.21502-1-o.rempel@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:50839 "EHLO metis.ext.4.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751671AbdFKGTZ (ORCPT ); Sun, 11 Jun 2017 02:19:25 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: Rob Herring Cc: Oleksij Rempel , "kernel@pengutronix.de" , Linus Walleij , Alexandre Courbot , Mark Rutland , "linux-gpio@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , barebox@lists.infradead.org Hi Rob, On Fri, Jun 09, 2017 at 10:41:30AM -0500, Rob Herring wrote: > On Fri, Jun 9, 2017 at 9:16 AM, Oleksij Rempel wrote: > > This property is needed for barebox or may be other bootloaders > > to set proper gpio configuration as early as possible. > > > > This example is mainly based on "lines-initial-states" property > > from this binding documentation: > > Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt > > Don't we have a binding for this already based on gpio-hogs. Markus Pargmann was working on this topic before and suddenly was not able to finish it. I found only some not finished discussions and no code or documentation in linux kernel upstream. So far, I was able to find fallowing patches and discussions: patch 23.08.2015, last comment 11.05.2017: https://patchwork.kernel.org/patch/7096721/ patch 23.02.2016, last comment 09.03.2016: https://patchwork.ozlabs.org/patch/586743/ Since there was objections about node-like design for gpio-initval, I provided an array property, which is similar to initval properties already used for different other device nodes. For example: Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt qcom,ath10k-calibration-data Documentation/devicetree/bindings/gpio/gpio-pcf857x.txt lines-initial-states Please fixme if I miss something. -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |