> -----Original Message----- > From: Ulf Hansson [mailto:ulf.hansson@xxxxxxxxxx] > Sent: Thursday, October 25, 2018 7:31 PM [...] > + Jon > > [...] > > >> > >> In regards to model the HW correctly. I don't believe your HW > >> topology have each PWM block, GPIO block, etc, in their own gate-able > power domain, right? > >> Or is it so? > >> > > > > First of all, thanks for your and Rob's good suggestions. > > I spent a lot more time to do research to try to make it better > > according to your suggestions. Some of your ideas absolutely helped me > > a lot and gave me some inspirations. > > > > Some new findings are that some of our power domains are organized in > > a tree was because the kernel does not support multi-power domains for one > device. > > but from HW point of view, they're identical. > > You can more serious situation from local tree at here: [...] > > > > I just found your following patch perfectly addressed our issue as we > > do have many Devices requires to handle multi power domains. > > 3c095f32a92b PM / Domains: Add support for multi PM domains per device > > to genpd e.g. For LVDS devices, it need both LVDS and DC(Display controller) > PD to work. > > Thanks for letting me know about further use cases about multiple PM domain > per device. Very interesting. > > > > > Now i was trying to understand all of our current user case with the > > team, If all of them do not need a tree to address dependency issue, I may > remove them all from device tree. > > Then it would be much more clearer than before and be something like what > Tegra does. > > include/dt-bindings/power/tegra186-powergate.h > > drivers/soc/tegra/powergate-bpmp.c > > Yes! > > > > > For example, 1 #power-domain-cells will be enough. The first cell can > > be a global SCU power domain and the 2nd cell the device ID. > > Hopefully this can be what you and Rob want. > > > > If any good suggestions please let me know. > > It makes perfect sense! > > In regards to deploy support for multiple PM domains per device, you may > have a look at the recent work done Jon Hunter for the Tegra xHCI genpd > support [1]. > Thanks for sharing this info. Will investigate it. Regards Dong Aisheng > [...] > > Kind regards > Uffe
