Re: [PATCH] soc: rockchip: Set the proper PWM for rk3288
From: Heiko Stuebner
Date: Thu Apr 11 2019 - 07:42:57 EST
Am Dienstag, 9. April 2019, 22:49:05 CEST schrieb Douglas Anderson:
> The rk3288 SoC has two PWM implementations available, the "old"
> implementation and the "new" one. You can switch between the two of
> them by flipping a bit in the grf.
> The "old" implementation is the default at chip power up but isn't the
> one that's officially supposed to be used. ...and, in fact, the
> driver that gets selected in Linux using the rk3288 device tree only
> supports the "new" implementation.
> Long ago I tried to get a switch to the right IP block landed in the
> PWM driver (search for "rk3288: Switch to use the proper PWM IP") but
> that got rejected. In the mean time the grf has grown a full-fledged
> driver that already sets other random bits like this. That means we
> can now get the fix landed.
> For those wondering how things could have possibly worked for the last
> 4.5 years, folks have mostly been relying on the bootloader to set
> this bit. ...but occasionally folks have pointed back to my old patch
> series  in downstream kernels.
>  https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1391597.html
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
applied for 5.2