On Thu, Jan 23, 2014 at 11:52:03AM +0000, Russell King - ARM Linux wrote: > On Thu, Jan 23, 2014 at 08:37:14AM +0100, Lothar Waßmann wrote: > > This wouldn't buy much without a material change to of_pwm_get(). > > The function of_parse_phandle_with_args() called by of_pwm_get() > > requires the number of args in the pwms property be greater or equal to > > the #pwm-cells property in the pwm node. Thus, the interesting case of > > having #pwm-cells = <3> without changing the existing users is > > prohibited by of_parse_phandle_with_args(). > > I really don't think that's a problem we need to be concerned with at > the moment. What we need is for the kernel to be able to parse files > with #pwm-cells = <2> with the pwms property containing two arguments, > and when they're updated to #pwm-cells = <3> with the pwms property > containing three arguments. > > Yes, that means all the board dt files need to be updated at the same > time to include the additional argument, but I don't see that as a big > problem. > > What we do need to do is to adjust the PWM parsing code such that it's > possible to use either specification without causing any side effects. > > I would test this, but as u-boot is rather fscked at the moment and the > networking has broken on my cubox-i as a result... and it seems that the > u-boot developers have pissed off cubox-i u-boot hackers soo much that > they've dropped u-boot in favour of barebox... Oh, and another reason... the u-boot video settings are totally and utterly buggered to the point that it doesn't produce correct timings, and it seems that u-boot people have zero interest in fixing that, so u-boot mainline is basically refusing to fix this - another reason to stay away from it. (1024x768 @ 60Hz produces 70Hz refresh on iMX6Q here - I've seen it produce 51Hz on iMX6S, both of which are far enough out that lots of display devices will not accept it as a valid signal.) -- FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up. Estimation in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad. Estimate before purchase was "up to 13.2Mbit". -- 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
