Re: [PATCH v12 1/1] serial: core: Start managing serial controllers to enable runtime PM

From: Greg Kroah-Hartman
Date: Tue May 30 2023 - 10:43:37 EST

On Thu, May 25, 2023 at 02:30:30PM +0300, Tony Lindgren wrote:
> We want to enable runtime PM for serial port device drivers in a generic
> way. To do this, we want to have the serial core layer manage the
> registered physical serial controller devices.
> To manage serial controllers, let's set up a struct bus and struct device
> for the serial core controller as suggested by Greg and Jiri. The serial
> core controller devices are children of the physical serial port device.
> The serial core controller device is needed to support multiple different
> kind of ports connected to single physical serial port device.
> Let's also set up a struct device for the serial core port. The serial
> core port instances are children of the serial core controller device.
> With the serial core port device we can now flush pending TX on the
> runtime PM resume as suggested by Johan.
> Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Suggested-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
> Suggested-by: Johan Hovold <johan@xxxxxxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---

Thanks for sticking with this, looks good now so I've queued it up in my

greg k-h