On Thu, 2015-05-28 at 14:26 +0000, Tirdea, Irina wrote: > > > -----Original Message----- > > From: linux-input-owner@xxxxxxxxxxxxxxx [mailto: > > linux-input-owner@xxxxxxxxxxxxxxx] On Behalf Of Mark Rutland > > Sent: 28 May, 2015 16:24 > > To: Tirdea, Irina > > Cc: Dmitry Torokhov; Bastien Nocera; linux-input@xxxxxxxxxxxxxxx; > > devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > > Subject: Re: [PATCH 8/9] input: goodix: add support for ESD > > > > On Thu, May 28, 2015 at 01:47:44PM +0100, Irina Tirdea wrote: > > > Add ESD (Electrostatic Discharge) protection mechanism. > > > > > > The driver enables ESD protection in HW and checks a register > > > to determine if ESD occurred. If ESD is signalled by the HW, > > > the driver will reset the device. > > > > > > The ESD poll time (in ms) can be set through > > > esd-recovery-timeout-ms ACPI/DT property. If it is set to 0, > > > ESD protection is disabled. > > > > > > Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx> > > > --- > > > .../bindings/input/touchscreen/goodix.txt | 4 + > > > drivers/input/touchscreen/goodix.c | 106 > > > ++++++++++++++++++++- > > > 2 files changed, 106 insertions(+), 4 deletions(-) > > > > > > diff --git > > > a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > > index 9e4ff69..9132ee0 100644 > > > --- > > > a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > > +++ > > > b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > > @@ -19,6 +19,10 @@ Optional properties: > > > > > > - device-config : device configuration information > > > (specified as byte > > > array). Maximum size is 240 bytes. > > > + - esd-recovery-timeout-ms : ESD poll time (in milli seconds) > > > for the driver to > > > + check if ESD occurred and in that > > > case reset the > > > + device. ESD is disabled if this > > > property is not set > > > + or is set to 0. > > > > This sounds like software configuration rather than HW description. > > Is > > there any reason this needs to be a DT property? > > > > Although this enables a software feature, it depends on the platform > if electrostatic discharge > protection should be enabled or not. Some platform designs handle ESD > better and do not need > the SW mechanism, so the property can be used to disable it. > > I also saw an example in > Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt > and I though this is the standard way to use it. As for the configuration data, is this useful/used on ACPI? > > Can we not just choose a sensible default and allow this to be > > overridden dynamically? > > I could separate the enabling part from the actual poll timeout by > using a DT property to enable/disable > ESD and a sysfs property to set the timeout. I can also move this > over to sysfs entirely if you prefer. If this needs to be in the DT for some devices, and isn't available from ACPI, maybe we should have a list of DMI matches for ACPI instead, with a module option to override it? -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
