| Message ID | 1447675269-8831-4-git-send-email-mpa@pengutronix.de |
|---|---|
| State | Changes Requested, archived |
| Headers | show |
On Mon, Nov 16, 2015 at 01:01:04PM +0100, Markus Pargmann wrote: > This is the touchscreen conversion queue binding documentation. It uses > the shared imx25 ADC. > > Signed-off-by: Markus Pargmann <mpa@pengutronix.de> > --- > > Notes: > Changes in v5: > - Fix signed/unsigned comparison > - Fix unused variable settling_time by putting it in the correct argument list > - Use continous conversion queue with the repeat feature and a proper > repeat-wait. Previously the touchscreen caused massive number of interrupts. > > .../bindings/input/touchscreen/fsl-mx25-tcq.txt | 29 ++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > new file mode 100644 > index 000000000000..89ab47a3acc1 > --- /dev/null > +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > @@ -0,0 +1,29 @@ > +Freescale mx25 TS conversion queue module > + > +mx25 touchscreen conversion queue module which controls the ADC unit of the > +mx25 for attached touchscreens. > + > +Required properties: > + - compatible: Should be "fsl,imx25-tcq". > + - reg: Memory range of the device. > + - interrupts: Should be the interrupt number associated with this module within > + the tscadc unit (<0>). > + - interrupt-parent: Should be a phandle to the tscadc unit. > + - fsl,wires: Should be '<4>' or '<5>' > + > +Optional properties: > + - fsl,pen-debounce: Pen debounce time in nanoseconds. > + - fsl,pen-threshold: Pen-down threshold for the touchscreen. > + - fsl,settling-time: Settling time in nanoseconds. Don't we have standard properties for these? If not, these should have units. I don't understand the difference between debounce and settling times. Please make that clear in the doc. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi, On Monday 16 November 2015 08:16:09 Rob Herring wrote: > On Mon, Nov 16, 2015 at 01:01:04PM +0100, Markus Pargmann wrote: > > This is the touchscreen conversion queue binding documentation. It uses > > the shared imx25 ADC. > > > > Signed-off-by: Markus Pargmann <mpa@pengutronix.de> > > --- > > > > Notes: > > Changes in v5: > > - Fix signed/unsigned comparison > > - Fix unused variable settling_time by putting it in the correct argument list > > - Use continous conversion queue with the repeat feature and a proper > > repeat-wait. Previously the touchscreen caused massive number of interrupts. > > > > .../bindings/input/touchscreen/fsl-mx25-tcq.txt | 29 ++++++++++++++++++++++ > > 1 file changed, 29 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > new file mode 100644 > > index 000000000000..89ab47a3acc1 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > @@ -0,0 +1,29 @@ > > +Freescale mx25 TS conversion queue module > > + > > +mx25 touchscreen conversion queue module which controls the ADC unit of the > > +mx25 for attached touchscreens. > > + > > +Required properties: > > + - compatible: Should be "fsl,imx25-tcq". > > + - reg: Memory range of the device. > > + - interrupts: Should be the interrupt number associated with this module within > > + the tscadc unit (<0>). > > + - interrupt-parent: Should be a phandle to the tscadc unit. > > + - fsl,wires: Should be '<4>' or '<5>' > > + > > +Optional properties: > > + - fsl,pen-debounce: Pen debounce time in nanoseconds. > > + - fsl,pen-threshold: Pen-down threshold for the touchscreen. > > + - fsl,settling-time: Settling time in nanoseconds. > > Don't we have standard properties for these? If not, these should have > units. I just found properties like 'debounce_timeout' without a vendor prefix but they don't seem to be standard properties: Documentation/devicetree/bindings/input/touchscreen/brcm,iproc-touchscreen.txt For fsl,pen-threshold there is no real unit. It is the ratio between the internal voltage reference and the measured voltage after one of the touchscreen plates was precharged. However there are limits, I will add a better description. > > I don't understand the difference between debounce and settling times. > Please make that clear in the doc. The settling time is the time waited after charging the touchscreen plates. The pen-debounce time is a delay after a pen down has been detected. Best Regards, Markus > > Rob > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
On Mon, Nov 16, 2015 at 08:16:09AM -0600, Rob Herring wrote: > On Mon, Nov 16, 2015 at 01:01:04PM +0100, Markus Pargmann wrote: > > This is the touchscreen conversion queue binding documentation. It uses > > the shared imx25 ADC. > > > > Signed-off-by: Markus Pargmann <mpa@pengutronix.de> > > --- > > > > Notes: > > Changes in v5: > > - Fix signed/unsigned comparison > > - Fix unused variable settling_time by putting it in the correct argument list > > - Use continous conversion queue with the repeat feature and a proper > > repeat-wait. Previously the touchscreen caused massive number of interrupts. > > > > .../bindings/input/touchscreen/fsl-mx25-tcq.txt | 29 ++++++++++++++++++++++ > > 1 file changed, 29 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > new file mode 100644 > > index 000000000000..89ab47a3acc1 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt > > @@ -0,0 +1,29 @@ > > +Freescale mx25 TS conversion queue module > > + > > +mx25 touchscreen conversion queue module which controls the ADC unit of the > > +mx25 for attached touchscreens. > > + > > +Required properties: > > + - compatible: Should be "fsl,imx25-tcq". > > + - reg: Memory range of the device. > > + - interrupts: Should be the interrupt number associated with this module within > > + the tscadc unit (<0>). > > + - interrupt-parent: Should be a phandle to the tscadc unit. > > + - fsl,wires: Should be '<4>' or '<5>' > > + > > +Optional properties: > > + - fsl,pen-debounce: Pen debounce time in nanoseconds. > > + - fsl,pen-threshold: Pen-down threshold for the touchscreen. > > + - fsl,settling-time: Settling time in nanoseconds. > > Don't we have standard properties for these? These are usually controller-specific so no. Thanks.
diff --git a/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt new file mode 100644 index 000000000000..89ab47a3acc1 --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt @@ -0,0 +1,29 @@ +Freescale mx25 TS conversion queue module + +mx25 touchscreen conversion queue module which controls the ADC unit of the +mx25 for attached touchscreens. + +Required properties: + - compatible: Should be "fsl,imx25-tcq". + - reg: Memory range of the device. + - interrupts: Should be the interrupt number associated with this module within + the tscadc unit (<0>). + - interrupt-parent: Should be a phandle to the tscadc unit. + - fsl,wires: Should be '<4>' or '<5>' + +Optional properties: + - fsl,pen-debounce: Pen debounce time in nanoseconds. + - fsl,pen-threshold: Pen-down threshold for the touchscreen. + - fsl,settling-time: Settling time in nanoseconds. + +This device includes two conversion queues which can be added as subnodes. +The first queue is for the touchscreen, the second for general purpose ADC. + +Example: + tsc: tcq@50030400 { + compatible = "fsl,imx25-tcq"; + reg = <0x50030400 0x60>; + interrupt-parent = <&tscadc>; + interrupts = <0>; + fsl,wires = <4>; + };
This is the touchscreen conversion queue binding documentation. It uses the shared imx25 ADC. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> --- Notes: Changes in v5: - Fix signed/unsigned comparison - Fix unused variable settling_time by putting it in the correct argument list - Use continous conversion queue with the repeat feature and a proper repeat-wait. Previously the touchscreen caused massive number of interrupts. .../bindings/input/touchscreen/fsl-mx25-tcq.txt | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt