On Tue, Jan 21, 2020 at 05:56:39PM +0100, Rafael J. Wysocki wrote: > On Tue, Jan 21, 2020 at 5:19 PM Sakari Ailus > <sakari.ailus@xxxxxxxxxxxxxxx> wrote: > > > > On Tue, Jan 21, 2020 at 05:09:44PM +0100, Rafael J. Wysocki wrote: > > > On Tue, Jan 21, 2020 at 2:41 PM Sakari Ailus > > > <sakari.ailus@xxxxxxxxxxxxxxx> wrote: > > > > > > > > Document the probe-low-power _DSD property and how it is used with I²C > > > > drivers. > > > > > > > > Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> > > > > --- > > > > .../acpi/dsd/probe-low-power.rst | 28 +++++++++++++++++++ > > > > Documentation/firmware-guide/acpi/index.rst | 1 + > > > > 2 files changed, 29 insertions(+) > > > > create mode 100644 Documentation/firmware-guide/acpi/dsd/probe-low-power.rst > > > > > > > > diff --git a/Documentation/firmware-guide/acpi/dsd/probe-low-power.rst b/Documentation/firmware-guide/acpi/dsd/probe-low-power.rst > > > > new file mode 100644 > > > > index 0000000000000..e0343ffefe071 > > > > --- /dev/null > > > > +++ b/Documentation/firmware-guide/acpi/dsd/probe-low-power.rst > > > > @@ -0,0 +1,28 @@ > > > > +.. SPDX-License-Identifier: GPL-2.0 > > > > + > > > > +====================================== > > > > +Probing I²C devices in low power state > > > > +====================================== > > > > + > > > > +Introduction > > > > +============ > > > > + > > > > +In some cases it may be preferred to leave certain devices powered off for > > > > +the entire system bootup if powering on these devices has adverse side > > > > +effects, beyond just powering on the said device. The _DSD property > > > > +"probe-low-power" has been defined for this purpose. > > > > > > Well, if you say "has been defined", you need to provide a pointer to > > > the definition document (a specification of some sort or similar). > > > > How about: > > > > s/has been defined/is used/ > > I would say "Linux recognizes the ... that can be used for this purpose." Ack; I'll use this in v5. -- Sakari Ailus
