On 9/9/19 9:23 AM, Sascha Hauer wrote: > On Fri, Sep 06, 2019 at 04:01:27PM +0200, Ahmad Fatoum wrote: >> The SN74273 is an octal D-Type Flip-Flop. When used as an output expander, >> N existing output signals can be turned into (N-8)*8 outputs using >> N-8 chips. Add driver to facilitate this. > > The reason I haven't mainlined this driver when writing it was that > Linux also has a driver for the 74273, but in a completely different > setup. In the Linux driver the 74273 is assumed to have its inputs on > the data bus together with a separate address decoder. > The chip in this driver here instead is connected via GPIO pins. For > Using flipflops as GPIO expanders there a myriads of different ways to > implement, so I have my doubts how useful it is to even try to put them > in a generic driver. FTR: I talked this over with Sascha. As I understood, the main issue is with reserving a fairly generic "ti,74273-gpio" compatible with what is a very special way of using these flip flops. We could however get it in with a different proprietary compatible. I might revisit this in future along with a kernel driver, but please dismiss for now. > > Sascha > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
