From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Sender: rtc-linux@googlegroups.com Received: from mail-lf0-x243.google.com (mail-lf0-x243.google.com. [2a00:1450:4010:c07::243]) by gmr-mx.google.com with ESMTPS id f7si583712lbf.0.2016.04.10.08.23.04 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Apr 2016 08:23:04 -0700 (PDT) Received: by mail-lf0-x243.google.com with SMTP id p64so5301894lfg.0 for ; Sun, 10 Apr 2016 08:23:04 -0700 (PDT) Message-ID: <1460301781.17404.171.camel@gmail.com> Subject: [rtc-linux] Re: [PATCH 0/4] support control with using GPIO lines From: Sergei Ianovich To: Alexandre Belloni , Akinobu Mita Cc: rtc-linux@googlegroups.com, devicetree@vger.kernel.org, Alessandro Zummo Date: Sun, 10 Apr 2016 18:23:01 +0300 In-Reply-To: <20160410151237.GD5377@piout.net> References: <1460300366-25248-1-git-send-email-akinobu.mita@gmail.com> <20160410151237.GD5377@piout.net> Content-Type: text/plain; charset=UTF-8 Mime-Version: 1.0 Reply-To: rtc-linux@googlegroups.com List-ID: List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , On Sun, 2016-04-10 at 17:12 +0200, Alexandre Belloni wrote: > Hi, >=20 > On 10/04/2016 at 23:59:22 +0900, Akinobu Mita wrote : > >=20 > > This series adds support access to DS1302 with GPIO lines. > >=20 > > Recently rtc-ds1302 is rewritten using SPI 3wire mode.=C2=A0=C2=A0This = adds > > another platform driver using GPIO while supporting both modes. > >=20 > > Thie series first fixes two problems I found while tesing, secondly > > introduces the abstraction layer for the register access which > > enables > > to share the most code between spi and platform driver, and adds > > the platform driver using GPIO. > >=20 > Well, isn't spi-gpio fitting for that use case? I'd like to avoid > open > coding gpio bitbanging in the driver. No, unfortunately. I've investigated this possibility for my platform. spi-gpio doesn't support LSB-first and 3-wire options. Adding support there is a very big change. The best way to add GPIO support is to create spi-gpio-3wire with LSB-first support. --=20 --=20 You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. ---=20 You received this message because you are subscribed to the Google Groups "= rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to rtc-linux+unsubscribe@googlegroups.com. For more options, visit https://groups.google.com/d/optout. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Ianovich Subject: Re: [PATCH 0/4] support control with using GPIO lines Date: Sun, 10 Apr 2016 18:23:01 +0300 Message-ID: <1460301781.17404.171.camel@gmail.com> References: <1460300366-25248-1-git-send-email-akinobu.mita@gmail.com> <20160410151237.GD5377@piout.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20160410151237.GD5377-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Alexandre Belloni , Akinobu Mita Cc: rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Alessandro Zummo List-Id: devicetree@vger.kernel.org On Sun, 2016-04-10 at 17:12 +0200, Alexandre Belloni wrote: > Hi, >=20 > On 10/04/2016 at 23:59:22 +0900, Akinobu Mita wrote : > >=20 > > This series adds support access to DS1302 with GPIO lines. > >=20 > > Recently rtc-ds1302 is rewritten using SPI 3wire mode.=C2=A0=C2=A0T= his adds > > another platform driver using GPIO while supporting both modes. > >=20 > > Thie series first fixes two problems I found while tesing, secondly > > introduces the abstraction layer for the register access which > > enables > > to share the most code between spi and platform driver, and adds > > the platform driver using GPIO. > >=20 > Well, isn't spi-gpio fitting for that use case? I'd like to avoid > open > coding gpio bitbanging in the driver. No, unfortunately. I've investigated this possibility for my platform. spi-gpio doesn't support LSB-first and 3-wire options. Adding support there is a very big change. The best way to add GPIO support is to create spi-gpio-3wire with LSB-first support. -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html