On Mon, Nov 4, 2019 at 8:11 PM Rob Herring <robh+dt@xxxxxxxxxx> wrote: > [Peter] > > The device needs the RST line to be high, otherwise it is not > > accessible. If it does not have reset control how can we make sure that > > the GPIO line is in correct state? > > Just like the reset code, drivers register their use of the reset and > the core tracks users and prevents resetting when not safe. Maybe the > reset subsystem needs to learn about GPIO resets. (...) I agree. Certainly the reset subsystem can do what the regulator subsystem is already doing: request the GPIO line nonexclusive and handle any reference counting and/or quirks that are needed in a hypothetical drivers/reset/reset-gpio.c driver. There is no such driver today, just a "reset" driver in drivers/power/reset that resets the whole system. But I see no problem in creating a proper reset driver in drivers/reset to handle a few peripherals with a shared GPIO reset line. Yours, Linus Walleij
