From: Johan Hovold <johan@kernel.org>
To: Andreas Kemnade <andreas@kemnade.info>
Cc: "Johan Hovold" <johan@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
devicetree@vger.kernel.org,
"Discussions about the Letux Kernel"
<letux-kernel@openphoenux.org>,
"Jonathan Cameron" <jic23@kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Tony Lindgren" <tony@atomide.com>,
"H. Nikolaus Schaller" <hns@goldelico.com>,
kernel@pyra-handheld.com, "Russell King" <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org,
"Thierry Reding" <treding@nvidia.com>,
"Rob Herring" <robh+dt@kernel.org>,
"Kevin Hilman" <khilman@baylibre.com>,
"Benoît Cousson" <bcousson@baylibre.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
linux-omap@vger.kernel.org, "Andreas Färber" <afaerber@suse.de>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [Letux-kernel] [PATCH v5 3/5] misc serdev: Add w2sg0004 (gps receiver) power control driver
Date: Fri, 12 Jan 2018 15:46:47 +0100 [thread overview]
Message-ID: <20180112144647.GA5992@localhost> (raw)
In-Reply-To: <20180109184347.28ba0a6e@aktux>
On Tue, Jan 09, 2018 at 06:43:47PM +0100, Andreas Kemnade wrote:
> On Fri, 22 Dec 2017 13:44:27 +0100
> Johan Hovold <johan@kernel.org> wrote:
>
> [...]
> > I'd suggest reiterating the problem you're trying to solve and
> > enumerating the previously discussed potential solutions in order to
> > find a proper abstraction level for this (before getting lost in
> > implementation details).
> >
> The main point here is in short words: Having a device powered on or off
> when the uart it is attached to, is used or not used anymore,
> so the already available userspace applications do not need to be changed.
So we'd end up with something in-between a kernel driver and a
user-space solution. What about devices that need to be (partially)
powered also when the port isn't open? A pure user-space solution would
be able to handle all variants.
> I digged out a bit around:
> alternative aproaches were:
> adding hooks to the uart/tty layer:
> https://marc.info/?l=linux-kernel&m=143333222014616&w=2
> https://marc.info/?l=devicetree&m=143130955414580&w=2
Thanks for the pointers, I remember those threads...
> I do not find it right now in my archive:
> adding a virtual gpio for dtr to the omap_serial driver.
> The driver behind the virtual io would then handle pm. One reason it was
> rejected was that the devicetree should only contain real hardware and
> not virtual stuff.
Oh, yeah, I think something like that made it in briefly before getting
reverted again.
I'll respond to Nikolaus mail as well.
Johan
next prev parent reply other threads:[~2018-01-12 14:46 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 7:49 [PATCH v5 0/5] misc serdev: new serdev based driver for Wi2Wi w2sg00x4 GPS module H. Nikolaus Schaller
2017-12-01 7:49 ` [PATCH v5 1/5] dt-bindings: define vendor prefix for Wi2Wi, Inc H. Nikolaus Schaller
2017-12-01 14:44 ` Andreas Färber
2017-12-01 7:49 ` [PATCH v5 2/5] dt-bindings: gps: add w2sg00x4 bindings documentation (GPS module with UART)) H. Nikolaus Schaller
2017-12-01 7:49 ` [PATCH v5 3/5] misc serdev: Add w2sg0004 (gps receiver) power control driver H. Nikolaus Schaller
2017-12-22 12:44 ` Johan Hovold
2017-12-22 14:40 ` H. Nikolaus Schaller
2018-01-09 11:55 ` [Letux-kernel] " H. Nikolaus Schaller
2018-01-12 15:39 ` Johan Hovold
2018-01-12 17:59 ` H. Nikolaus Schaller
2018-01-18 6:13 ` Johan Hovold
2018-01-18 13:43 ` H. Nikolaus Schaller
2018-03-07 15:53 ` H. Nikolaus Schaller
2018-03-19 14:05 ` Johan Hovold
2018-02-12 15:26 ` [Letux-kernel] " Pavel Machek
2018-02-27 7:04 ` Johan Hovold
2018-02-27 7:32 ` H. Nikolaus Schaller
2018-03-19 13:54 ` Johan Hovold
2018-03-20 14:49 ` H. Nikolaus Schaller
2018-03-26 13:59 ` Pavel Machek
2018-02-27 18:38 ` Pavel Machek
2018-02-12 15:25 ` Pavel Machek
2018-01-09 17:43 ` Andreas Kemnade
2018-01-12 14:46 ` Johan Hovold [this message]
2018-01-12 18:40 ` Andreas Kemnade
2018-01-18 6:47 ` Johan Hovold
2018-03-08 6:16 ` Andreas Kemnade
2018-03-19 14:02 ` Johan Hovold
2017-12-01 7:49 ` [PATCH v5 4/5] DTS: gta04: add uart2 child node for w2sg00x4 H. Nikolaus Schaller
2017-12-21 14:53 ` Tony Lindgren
2017-12-01 7:49 ` [PATCH v5 5/5] misc serdev: w2sg0004: add debugging code and Kconfig H. Nikolaus Schaller
2017-12-22 12:51 ` Johan Hovold
2017-12-22 14:41 ` H. Nikolaus Schaller
2017-12-22 14:58 ` Greg Kroah-Hartman
2017-12-18 8:52 ` [PATCH v5 0/5] misc serdev: new serdev based driver for Wi2Wi w2sg00x4 GPS module H. Nikolaus Schaller
2017-12-18 14:48 ` Greg Kroah-Hartman
2017-12-18 14:52 ` H. Nikolaus Schaller
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