Hi, On Mon, Jan 9, 2017 at 5:27 PM, Xing Zheng <zhengxing at rock-chips.com> wrote: > +Optional Properties: > + > +- rockchip,grf: phandle to the syscon managing the "general register files" > + If missing pll rates are not changable, due to the missing pll lock status. On rk3399 the GRF isn't used for pll lock status. It's used for PLL muxes. ...so technically if you don't include it then the PLL muxes won't be changeable. Hopefully the code handles this if the property is listed as "Optional". ...and unless Heiko says otherwise, you probably need to list it as "Optional" since (presumably) there might be backward compatibility issues. -Doug
