linux-kernel - Re: [PATCH v10 1/1] serial: core: Start managing serial controllers to enable runtime PM

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Date:   Mon, 8 May 2023 16:35:03 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v10 1/1] serial: core: Start managing serial controllers
 to enable runtime PM

* Andy Shevchenko <andriy.shevchenko@...el.com> [230508 12:11]:
> On Mon, May 08, 2023 at 02:03:35PM +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 do this, 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.
> 
> Sorry, I'm on vacation. But just brief comments below.
> In general looks good to me.

OK have a nice vacation :)

> > -obj-$(CONFIG_SERIAL_CORE) += serial_core.o
> > +obj-$(CONFIG_SERIAL_CORE) += serial_base.o
> > +serial_base-objs := serial_core.o serial_base_bus.o serial_ctrl.o serial_port.o
> 
> 'objs' is for user space tools, kernel should use 'y'

Oh OK.

> > +static DEFINE_RUNTIME_DEV_PM_OPS(serial_port_pm, NULL,
> > +				 serial_port_runtime_resume, NULL);
> 
> Maybe
> 
> static DEFINE_RUNTIME_DEV_PM_OPS(serial_port_pm,
> 				 NULL, serial_port_runtime_resume, NULL);
> 
> for better logical split?

Sure.

Thanks,

Tony