On Thu, 2015-05-28 at 13:51 +0000, Tirdea, Irina wrote: > > > -----Original Message----- > > From: Mark Rutland [mailto:mark.rutland@xxxxxxx] > > Sent: 28 May, 2015 16:22 > > To: Tirdea, Irina > > Cc: Dmitry Torokhov; Bastien Nocera; linux-input@xxxxxxxxxxxxxxx; > > devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > > Purdila, Octavian > > Subject: Re: [PATCH 6/9] input: goodix: write configuration data to > > device > > > > On Thu, May 28, 2015 at 01:47:42PM +0100, Irina Tirdea wrote: > > > Goodix devices can be configured by writing this information > > > to the device at init. The configuration data can > > > be provided through the ACPI/device tree property > > > "device-config". If "device-config" is not set, the default > > > device configuration will be used. > > > > > > Signed-off-by: Octavian Purdila <octavian.purdila@xxxxxxxxx> > > > Signed-off-by: Irina Tirdea <irina.tirdea@xxxxxxxxx> > > > --- > > > .../bindings/input/touchscreen/goodix.txt | 5 + > > > drivers/input/touchscreen/goodix.c | 143 > > > +++++++++++++++++++++ > > > 2 files changed, 148 insertions(+) > > > > > > diff --git > > > a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > > index 7137881..9e4ff69 100644 > > > --- > > > a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > > +++ > > > b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt > > > @@ -15,6 +15,11 @@ Required properties: > > > - irq-gpio : GPIO pin used for IRQ > > > - reset-gpio : GPIO pin used for reset > > > > > > +Optional properties: > > > + > > > + - device-config : device configuration information > > > (specified as byte > > > + array). Maximum size is 240 bytes. > > > > Generally we frown on passing opaque data. > > > > What exactly is encoded in device-config? The description is very > > vague. > > > > Does this correspond to anything in a data sheet or manual? > > Yes, it is configuration data described in chapter 6.2. b of the > datasheet: > https://drive.google.com/folderview?id=0BxCVOQS3ZymGfmJyY2RKbE5XbVlKN > lktVTlwV0lxNEdxd2dzeWZER094cmJPVnMxN1F0Yzg&usp=sharing. > This includes things like x/y resolution, maximum touch numbers > supported, > interrupt flags, various sensitivity factors. > > I should have included a link to the datasheet in the commit message > - will do that in v2 for all patches. > > I did consider writing this as firmware, but it seems that some > Goodix touchscreens have a > real firmware they need to write in addition to this configuration > data. > If there is a better way to do this, please let me know and I will > change it. I would at least expect an excerpt from an ACPI DSDT that would make use of that feature. -- 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
