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 [1] in downstream kernels. > > [1] https://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1391597.html > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> applied for 5.2 Thanks Heiko _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
