Hi Wolfram > > pm_runtime_get_sync() > > myfunc_A() > > pm_runtime_put() > > ... > > pm_runtime_get_sync() > > myfunc_B() > > pm_runtime_put() > > > > It should be this ? > > > > pm_runtime_get_sync() > > myfunc_A() > > myfunc_B() > > pm_runtime_put() > > This is for power-off case, right? Wouldn't it be clearer then to add a > resume function to pm_ops of the I2C driver which reinit the registers? > Doing it before every transfer might be simpler but is also a bit > implicit or subtle, I'd think. > > And for completeness: The above is only for the power-off case. In > module-standby (MSTP bits), register values are always retained. > Correct?
I'm not sure detail of pm_runtime, but it depends on power-domain support ? On SH-Mobile case, it automatically power-off:ed if all driver user was gone. This feature is not yet supported on R-Car case I think. So, both case are not problem at this point, but 1st case will be problem if power-domain was suppored. (If my memory was correct...) -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html