Return-Path: Date: Mon, 22 Aug 2016 22:39:48 +0200 From: Sebastian Reichel To: "H. Nikolaus Schaller" Cc: One Thousand Gnomes , Oleksij Rempel , Rob Herring , Greg Kroah-Hartman , Marcel Holtmann , Jiri Slaby , Pavel Machek , Peter Hurley , NeilBrown , Arnd Bergmann , Linus Walleij , "open list:BLUETOOTH DRIVERS" , "linux-serial@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [RFC PATCH 0/3] UART slave device bus Message-ID: <20160822203947.ksxwnvzhc3tpnnx7@earth> References: <20160818011445.22726-1-robh@kernel.org> <20160818202900.hyvm4hfxedifuefn@earth> <20160819052125.ze5zilppwoe3f2lx@earth> <53A846F1-33E5-48C3-B3A6-DB251661CDD5@goldelico.com> <20160820143405.04303834@lxorguk.ukuu.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="l4y4f46z7f6kbxuw" In-Reply-To: List-ID: --l4y4f46z7f6kbxuw Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, On Sun, Aug 21, 2016 at 09:50:57AM +0200, H. Nikolaus Schaller wrote: > > Am 20.08.2016 um 15:34 schrieb One Thousand Gnomes : > >> What it is not about are UART/RS232 converters connected through USB o= r virtual > >> serial ports created for WWAN modems (e.g. /dev/ttyACM, /dev/ttyHSO). = Or BT devices > >> connected through USB (even if they also run HCI protocol). > >=20 > > It actually has to be about both because you will find the exact same > > device wired via USB SSIC/HSIC to a USB UART or via a classic UART. Not= is > > it just about embedded boards.=20 >=20 > Not necessarily. >=20 > We often have two interface options for exactly the sam sensor chips. The= y can be connected > either through SPI or I2C. Which means that there is a core driver for th= e chip and two different > transport glue components (see e.g. iio/accel/bmc150). >=20 > This does not require I2C to be able to handle SPI or vice versa or provi= de a common API. I don't understand this comparison. I2C and SPI are different protocols, while native UART and USB-connected UART are both UART. > And most Bluetooth devices I know have either UART or a direct > USB interface. So in the USB case there is no need to connect > it through some USB-UART bridge and treat it as an UART at all. I think having support for USB-UART dongles is useful for driver development and testing on non-embedded HW. -- Sebastian --l4y4f46z7f6kbxuw Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJXu2MQAAoJENju1/PIO/qavakQAJlyQ58qfM4NAUPbFv+Z5sTn n4ZarIrAdManP74WBeEtTLa2yD+k4+xSi9aPS9WGSk4PSt9nLcy+PLxUD58dsbAD YQers5Ffgxwm2F/CcoyM00XsR4+9qOq7F+gq7iuDmbo5Jb8D6kyP0qVvgUL963bI TjU/FW041++cFTFVZmwIfhGGBW/6+YblE0G9Pzt5maFghNaY4yu2Kg7FUd8G5YWM Ap5nVwZvOFkogPpsaJHvBezDb+f0kLT5nAbqQbMD4r5U14GS0c1th6MFZroWcUkP IQMCVpnIvT5TllbeEc1nzgKFrOG+KjkLcwaheAF7Jg57ZwXigaG73v1rB8or035B Kgqz/8aUWEXDe7t5rCTmqzwp9atqwdKaov7gYdXiM6lqVy7VZExMFW1kajyFvirJ D7qBY2ThwRl1O4uWgVEGCNepDo9zLh1Fvh3BESlOp0MUWjKN18Cv8HxE/7BYAeI2 Z+J/2TqHcB/ZP5PPpa7oZmRixPQGirvmjWg2Rx0XUvE2RC3tzLGc9QHVhp7WO1Lh F+A5k5qdlqatI4EQwSV6zAS9JpvmfkLB/YUHFOyztAzjdsgZ1HZZwPNhiunSE1gO +gNuIr/aUl/EciHow98RB/KClBu9Pw3aWRmNP0tBiE3ncCrtKP4jSe+ExLL7eqc6 Zhu/OKO128+DkqoOVS4y =DYam -----END PGP SIGNATURE----- --l4y4f46z7f6kbxuw--