Hi Wenyou, On Mon, Sep 18, 2017 at 05:26:16PM +0800, Yang, Wenyou wrote: > Hi Sakari, > > > On 2017/9/18 15:35, Sakari Ailus wrote: > > Hi Wenyou, > > > > Thanks for the update. > > > > The driver exposes controls that are accessible through the sub-device node > > even if the device hasn't been powered on. > > > > Many ISP and bridge drivers will also power the sensor down once the last > > user of the user space device nodes disappears. You could keep the device > > powered at all times or change the behaviour so that controls can be > > accessed when the power is off. > > > > The best option would be to convert the driver to use runtime PM. > Yes, I agree with you. > I also noticed there are a lot of things needed to improve except for it, > such as the platform data via device tree. > I would like do it in another patch set. I will continue to work on it. Adding runtime PM support later on sound good to me. > > An example of this can be found in drivers/media/i2c/ov13858.c . > A good example, thank you for your providing. -- Sakari Ailus e-mail: sakari.ailus@xxxxxx
