On Tue, Oct 25, 2016 at 4:55 PM, Sebastian Reichel <sre@xxxxxxxxxx> wrote: > Hi, > > On Wed, Aug 24, 2016 at 06:24:30PM -0500, Rob Herring wrote: >> This is a new approach to supporting UART slave devices using the >> existing serio bus. After Arnd's proding, I took another look at serio >> and decided extending it does make sense. Using serio primarily requires >> adding DT based device matching and supporting buffer based write and >> receive. >> >> Currently, I'm using the existing serio serport ldisc for testing. This >> requires using inputattach to open the tty and set the ldisc which in >> turn registers a serio port with the serio core: >> >> inputattach -bare /dev/ttyAMA1 >> >> Once a tty_port based serio port driver is in place, this step will not >> be needed. Supporting cases like a USB UART will also work if the USB >> UART is described in DT. If not described in DT, I'm not sure if the >> existing serio manual binding is sufficient (Need to figure out how that >> works). Slave drivers also need other ways to specify additional data >> using module params perhaps. Getting DT overlays to work for >> non-discoverable devices behind discoverable buses (i.e. detached from >> a base DT) is another option, but that's not yet supported in general. >> >> I've done all the serio changes in place, but ultimately I think at >> least the core of serio should be moved out of drivers/input/. I don't >> think it belongs under drivers/tty/ or drivers/tty/serial/, so >> drivers/serio/? >> >> BT is working under QEMU to the point a slave driver can bind to a >> serio port device via DT, register as a BT device, start sending out >> initial packets and receive data (typed at a terminal). Now I need to >> find a real device. > > I had a more detailed look at the series during the last two weeks. > For me the approach looks ok and it should work for the nokia bluetooth > use case. Actually my work on that driver is more or less stalled until > this is solved, so it would be nice to get this forward. Whose feedback > is this waiting from? I guess I think it is mainly waiting for me to spend more time on it and get the tty port part done. I could use help especially for converting the BT part properly. > * Alan & Greg for the serial parts > * Marcel for the bluetooth parts > * Dmitry for the serio parts > > Maybe you can try to find some minutes at the Kernel Summit to talk > about this? Still waiting for my invite... But I will be at Plumbers if folks want to discuss this. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
