On Wed, 29 Oct 2014, Steffen Trumtrar wrote: > On Wed, Oct 29, 2014 at 10:16:32AM +0000, Mark Brown wrote: > > On Wed, Oct 29, 2014 at 08:57:01AM +0100, Steffen Trumtrar wrote: > > > > > So, that shouldn't be a problem though, as I already cooked up a driver for > > > the L3 with all the ranges specified. The only thing I need to figure out > > > before I will post it, is how to nicely handle the WO remap register. > > > I think regmap might be able to handle this itself, but am not sure yet. > > > > It's supposed to be able to, not sure if anyone really tests that or not > > though so it's possible bugs crept in. Most write only registers can > > physically be read so actually come out as volatile rather than write > > only even if functionally there is no reason to read. > > Ah, I think you might be actually right there. IIRC it IS possible to read > from that register, but you only get 0s. Yes, you can read and it will be all 0s. So read-modify-write is not something you would want to do for instance. Alan > So, I shot myself in the knee with specifying that register as write-only > in my driver. > > Thanks, > Steffen > > -- > 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 | > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
