From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: Re: [PATCH] ARM: dts: sun7i: Add Goodix GT911 nodes for Wexler TAB7200 Date: Mon, 13 Apr 2015 18:09:51 +0200 Message-ID: <20150413160951.GJ29832@lukather> References: <1427789897-4085-1-git-send-email-mamlinav@gmail.com> <20150331144338.GG23664@lukather> <20150331221420.3b65d2540c7dbe1d12611e12@gmail.com> <20150402092259.GK23664@lukather> <20150411191816.cdc5ec802b01028eb2913906@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="x+WOirvrtTKur1pg" Return-path: Content-Disposition: inline In-Reply-To: <20150411191816.cdc5ec802b01028eb2913906-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Aleksei Mamlin Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org --x+WOirvrtTKur1pg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Apr 11, 2015 at 07:18:16PM +0300, Aleksei Mamlin wrote: > On Thu, 2 Apr 2015 11:22:59 +0200 > Maxime Ripard wrote: >=20 > > 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: > > >=20 > > > > Hi, > > > >=20 > > > > 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. > > > >=20 > > > > 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.=20 > > > The address(0x5d or 0x14) can be configured using a reset sequence, > > > which has not yet been implemented in the driver. > >=20 > > Which address is set up by the bootloader then? > > I assume that bootloader(u-boot) didn't sets up any address, but touchscr= een > controller usually uses 0x5d. Sometimes, after hard reset, it uses 0x14. > For this we need nodes on both adresses. I'm confused, who changes that address then? The controller itself? Maxime --=20 Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com --x+WOirvrtTKur1pg Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJVK+pOAAoJEBx+YmzsjxAgxS4P/jC5ztpUmNEx/cyoxng9JyE7 S/GCTj9EDhK6klWfkgZPgJjjDf6yLHIPsAmnVXU9/U5WDtpx3m2KlhkdxVTJiQEG 9NImXja8uAbi3SnTXTumXKqPV2cpTSTSRM2T+uToElCRLb7ObXzFwfvJL0mYoV2Z 9NN0KIBJqP78sHsRczAb5j5hidIOzcG4v/TGRMH7rbQLieUgSECTzEiKlvdeypEv wxN2kUawbTKnU7+EyDoB/m7n0CyV2A+/PtCM2CkUA7TiI9TYKeZcA0+eazEcyxba mv5p3H71ZtoUstOk5JfKzVeQKCSGT9CDHQJy2XJPFOdq0lWlWQZLSS/IyyQ9n+GO g4RPpmasTcxlY/Hwvu018hy1UlZFupm45B64P9yUG1KWdPK15U1rTz3kNrKBErKq /l+vI75TO65vG0GVDAdRTu9/chs+HFsXLQnUWVGUY+jpN9ShtlOQk/Npj2Lafq9t 7w50sQ6BCDZuDYoKoBRAAZaVGJVrYKV6h/58ZCw0ztViuuCdr+hr8uB3HiTcx8Zd fVlJxe7wQUDMoHQ6yHFXgEEhzW7TcV/huhw9SC8RNWAIgGq3W5zU1U3SGLdM4y7I /AfLUgKZzkfu5g2UHNnJU/bPIbt4ThMrrBFZdMjtFZN8ETClCgREvj+bU/oKZD+a QvWvaTgfbJqolIcwNqjV =gcpf -----END PGP SIGNATURE----- --x+WOirvrtTKur1pg-- -- 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