On 02/10/2019 15:00:18+0200, Marco Felsch wrote: > Hi, > > all of you using a edt,* touchscreen and currently the driver marks > the touchscreen as wakeup source. To keep backward compatibility I added > a workaround binding (see below) but Dmitry prefer to use the normal > "wakeup-source" binding and change the affected device-tree's > (discussion below). Can you give me your ack/nack for Dmitry's solution? > Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> > Regards, > Marco > > On 19-09-30 18:11, Rob Herring wrote: > > On Tue, Sep 17, 2019 at 10:26:58AM -0700, Dmitry Torokhov wrote: > > > On Tue, Sep 17, 2019 at 07:18:14PM +0200, Marco Felsch wrote: > > > > Hi Dmitry, > > > > > > > > On 19-09-17 10:07, Dmitry Torokhov wrote: > > > > > On Tue, Sep 17, 2019 at 05:58:04PM +0200, Marco Felsch wrote: > > > > > > The default driver behaviour is to enable the wakeup-source everytime. > > > > > > There are hardware designs which have a dedicated gpio to act as wakeup > > > > > > device. So it must be allowed to disable the wakeup-source capability. > > > > > > > > > > > > This patch adds the binding documentation to disable the wakeup-source > > > > > > capability. > > > > > > > > > > > > Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx> > > > > > > --- > > > > > > .../devicetree/bindings/input/touchscreen/edt-ft5x06.txt | 4 ++++ > > > > > > 1 file changed, 4 insertions(+) > > > > > > > > > > > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt > > > > > > index 870b8c5cce9b..4d6524fe3cf4 100644 > > > > > > --- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt > > > > > > +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt > > > > > > @@ -35,6 +35,10 @@ Optional properties: > > > > > > - pinctrl-0: a phandle pointing to the pin settings for the > > > > > > control gpios > > > > > > > > > > > > + - edt,disable-wakeup-source: If left the device will act as wakeup-source > > > > > > + (for legacy compatibility). Add the property > > > > > > + so the device won't act as wakeup-source. > > > > > > > > > > I think this is too ugly and I consider it being a bug in the driver > > > > > that it enables wakeup unconditionally. > > > > > > > > That's right. > > > > > > > > > Let's just update DTS in tree for devices that actually want it (I am > > > > > curious how many that do not declare "wakeup-source" have it working and > > > > > actually want it) and key the dirver behavior off the standard property. > > > > > > > > There are a few DTS using this driver and the current driver behaviour. > > > > We need to keep the backward compatibility since the DTB is part of the > > > > firmware and firmware isn't always included during a system-update. I > > > > know its ugly but IMHO that's the right way to go to keep the backward > > > > compatibility. Let us see what the DT-folk says. > > > > > > > > > Until we start seeing this controller in devices that actually have DTS > > > > > in hardware device tree I think it is better to use standard property. > > > > > > > > Sorry, I didn't get you here.. > > > > > > What I was trying to say is that I have not actually seen DTB that is > > > part of hardware or separately upgradable frimware (not talking about > > > ppc or sparc boxes, but ones that might be using this driver). It is > > > always built into the kernel in my experience, so backward compatibility > > > is simply a tool that is being used to prevent us from being too wild > > > with hacking on bindings, but rarely a practical concern. > > > > Well, that's self fulfilling... > > > > > In cases like this I think it is worthwhile to simply update in-tree > > > DTS and arrive at a sane binding. > > > > Get the maintainers of the affected platforms to agree to the changes. > > > > Rob > > > > -- > Pengutronix e.K. | | > Industrial Linux Solutions | http://www.pengutronix.de/ | > Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
