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From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Tomasz Figa <tfiga@chromium.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
	Wolfram Sang <wsa@the-dreams.de>,
	Luca Ceresoli <luca@lucaceresoli.net>,
	linux-i2c <linux-i2c@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Mani, Rajmohan" <rajmohan.mani@intel.com>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Bingbu Cao <bingbu.cao@intel.com>,
	Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>,
	Hyungwoo Yang <hyungwoo.yang@intel.com>,
	Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: [PATCH v8 0/6] Support running driver's probe for a device powered off
Date: Mon, 28 Sep 2020 23:49:06 +0300
Message-ID: <20200928204905.GD26842@paasikivi.fi.intel.com> (raw)
In-Reply-To: <CAAFQd5CP7bg+UQEp5uzuQY5a_xHLAB4ct81pkO0naAou=-QyKw@mail.gmail.com>

Hi Tomasz,

On Mon, Sep 28, 2020 at 06:49:22PM +0200, Tomasz Figa wrote:
> On Mon, Sep 28, 2020 at 4:18 PM Rafael J. Wysocki <rafael@kernel.org> wrote:
> >
> > On Sun, Sep 27, 2020 at 9:44 PM Tomasz Figa <tfiga@chromium.org> wrote:
> > >
> > > On Sun, Sep 27, 2020 at 9:39 PM Wolfram Sang <wsa@the-dreams.de> wrote:
> > > >
> > > >
> > > > > I think we might be overly complicating things. IMHO the series as is
> > > > > with the "i2c_" prefix removed from the flags introduced would be
> > > > > reusable as is for any other subsystem that needs it. Of course, for
> > > > > now, the handling of the flag would remain implemented only in the I2C
> > > > > subsystem.
> > > >
> > > > Just to be clear: you are suggesting to remove "i2c" from the DSD
> > > > binding "i2c-allow-low-power-probe". And you are not talking about
> > > > moving I2C_DRV_FL_ALLOW_LOW_POWER_PROBE to struct device_driver? I
> > > > recall the latter has been NACKed by gkh so far.
> > > >
> > >
> > > I'd also drop "I2C_" from "I2C_DRV_FL_ALLOW_LOW_POWER_PROBE", but all
> > > the implementation would remain where it is in the code. IOW, I'm just
> > > suggesting a naming change to avoid proliferating duplicate flags of
> > > the same meaning across subsystems.
> >
> > But that would indicate that the property was recognized by other
> > subsystems which wouldn't be the case, so it would be confusing.
> >
> > That's why it cannot be documented as a general property ATM too.
> 
> I guess that's true. Well, this is kAPI in the end, so if we have more
> subsystems, it could be always renamed. So feel free to ignore my
> previous comment.

I wouldn't expect this flag to be needed outside I²C since the other
potential use case (I3C) appears to be entirely free of power management,
so it's up to the drivers on ACPI, too.

The property itself, though, might be.

-- 
Regards,

Sakari Ailus

  reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-03  8:15 Sakari Ailus
2020-09-03  8:15 ` [PATCH v8 1/6] i2c: Allow an ACPI driver to manage the device's power state during probe Sakari Ailus
2020-09-03  8:15 ` [PATCH v8 2/6] Documentation: ACPI: Document i2c-allow-low-power-probe _DSD property Sakari Ailus
2020-09-03  8:15 ` [PATCH v8 3/6] ACPI: Add a convenience function to tell a device is in low power state Sakari Ailus
     [not found]   ` <0c2d4728-6e32-ef93-8961-381fe36cfdaa@linux.intel.com>
2020-09-11 13:01     ` Sakari Ailus
2020-09-03  8:15 ` [PATCH v8 4/6] ov5670: Support probe whilst the device is in a " Sakari Ailus
2020-09-03  8:15 ` [PATCH v8 5/6] media: i2c: imx319: Support probe while the device is off Sakari Ailus
2020-09-03  8:15 ` [PATCH v8 6/6] at24: Support probing while off Sakari Ailus
2020-09-09  9:35   ` Bartosz Golaszewski
2020-09-09 11:11     ` Wolfram Sang
2020-09-09 11:56       ` Bartosz Golaszewski
2020-09-09 12:16         ` Sakari Ailus
2020-09-11 12:11         ` Sakari Ailus
2020-10-06 11:20   ` Tomasz Figa
2020-10-06 11:23     ` Tomasz Figa
2020-09-11 12:49 ` [PATCH v8 0/6] Support running driver's probe for a device powered off Luca Ceresoli
2020-09-11 13:01   ` Sakari Ailus
2020-09-14  7:58     ` Luca Ceresoli
     [not found]       ` <20200914094727.GM26842@paasikivi.fi.intel.com>
2020-09-14 16:49         ` Luca Ceresoli
2020-09-23 11:08           ` Sakari Ailus
2020-09-23 15:37             ` Luca Ceresoli
2020-09-26 12:38         ` Tomasz Figa
2020-09-27 19:39           ` Wolfram Sang
2020-09-27 19:44             ` Tomasz Figa
2020-09-28 14:17               ` Rafael J. Wysocki
2020-09-28 16:49                 ` Tomasz Figa
2020-09-28 20:49                   ` Sakari Ailus [this message]
2020-09-26 12:46 ` Tomasz Figa

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