From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aleksei Mamlin Subject: Re: [PATCH] ARM: dts: sun7i: Add Goodix GT911 nodes for Wexler TAB7200 Date: Sat, 11 Apr 2015 19:18:16 +0300 Message-ID: <20150411191816.cdc5ec802b01028eb2913906@gmail.com> References: <1427789897-4085-1-git-send-email-mamlinav@gmail.com> <20150331144338.GG23664@lukather> <20150331221420.3b65d2540c7dbe1d12611e12@gmail.com> <20150402092259.GK23664@lukather> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150402092259.GK23664@lukather> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Maxime Ripard Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org On Thu, 2 Apr 2015 11:22:59 +0200 Maxime Ripard wrote: > On Tue, Mar 31, 2015 at 10:14:20PM +0300, Aleksei Mamlin wrote: > > On Tue, 31 Mar 2015 07:43:38 -0700 > > Maxime Ripard wrote: > > > > > Hi, > > > > > > On Tue, Mar 31, 2015 at 11:18:17AM +0300, Aleksei Mamlin wrote: > > > > This patch adds nodes for the Goodix GT911 touchscreen controller found > > > > on the Wexler TAB7200 tablet. Controller uses one of following I2C > > > > addresses: 0x5d or 0x14, so just add two nodes. > > > > > > In which case are these different addresses encountered? Different > > > revisions of the same board? > > > > According to the datasheet it is a feature of the controller. > > The address(0x5d or 0x14) can be configured using a reset sequence, > > which has not yet been implemented in the driver. > > Which address is set up by the bootloader then? > I assume that bootloader(u-boot) didn't sets up any address, but touchscreen controller usually uses 0x5d. Sometimes, after hard reset, it uses 0x14. For this we need nodes on both adresses. > > Maxime > > -- > Maxime Ripard, Free Electrons > Embedded Linux, Kernel and Android engineering > http://free-electrons.com -- Thanks and regards, Aleksei Mamlin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html