| Message ID | 1425369498-25541-2-git-send-email-mpa@pengutronix.de (mailing list archive) |
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On Tuesday 03 March 2015 08:58:11 Markus Pargmann wrote: > +Example: > + tscadc: tscadc@50030000 { > + compatible = "fsl,imx25-tsadc"; > + reg = <0x50030000 0xc>; > + interrupts = <46>; > + clocks = <&clks 119>; > + clock-names = "ipg"; > + interrupt-controller; > + #interrupt-cells = <1>; > + #address-cells = <1>; > + #size-cells = <1>; > + ranges; > + > + tsc: tcq@50030400 { > + compatible = "fsl,imx25-tcq"; > + reg = <0x50030400 0x60>; > + ... > + }; > + > + adc: gcq@50030800 { > + compatible = "fsl,imx25-gcq"; > + reg = <0x50030800 0x60>; > + ... > + }; > + }; > I wonder if we should just treat this MFD as a single IIO device that also registers to the input layer. Are there any other registers in the 0x50030000-0x50031000 range, or could the fsl,imx25-tcq and fsl,imx25-gcq devices be reused outside of a fsl,imx25-tsadc device? Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi, On Tue, Mar 03, 2015 at 10:02:12AM +0100, Arnd Bergmann wrote: > On Tuesday 03 March 2015 08:58:11 Markus Pargmann wrote: > > +Example: > > + tscadc: tscadc@50030000 { > > + compatible = "fsl,imx25-tsadc"; > > + reg = <0x50030000 0xc>; > > + interrupts = <46>; > > + clocks = <&clks 119>; > > + clock-names = "ipg"; > > + interrupt-controller; > > + #interrupt-cells = <1>; > > + #address-cells = <1>; > > + #size-cells = <1>; > > + ranges; > > + > > + tsc: tcq@50030400 { > > + compatible = "fsl,imx25-tcq"; > > + reg = <0x50030400 0x60>; > > + ... > > + }; > > + > > + adc: gcq@50030800 { > > + compatible = "fsl,imx25-gcq"; > > + reg = <0x50030800 0x60>; > > + ... > > + }; > > + }; > > > > I wonder if we should just treat this MFD as a single IIO device > that also registers to the input layer. > > Are there any other registers in the 0x50030000-0x50031000 > range, or could the fsl,imx25-tcq and fsl,imx25-gcq devices > be reused outside of a fsl,imx25-tsadc device? There are no other registers in this range. The tcq and gcq devices can not be used outside of the tsadc. gcq and tcq are identical units so it may work to use both of them as gcq for example but nothing else. It may work to have this as single IIO device. However this would be a major rework of this series. There are a lot less users of imx25 than imx6 for example. And of these users barely anyone uses this unit at all. I really would like to get these drivers mainline so others can use it. But after 1 year and 7 versions of this series I don't want to put a lot of work into these drivers. I think there are other components in the kernel where the time is better used. Best Regards, Markus
On Thu, Mar 5, 2015 at 4:12 AM, Markus Pargmann <mpa@pengutronix.de> wrote: > There are no other registers in this range. The tcq and gcq devices can > not be used outside of the tsadc. gcq and tcq are identical units so it > may work to use both of them as gcq for example but nothing else. > > It may work to have this as single IIO device. However this would be a > major rework of this series. There are a lot less users of imx25 than > imx6 for example. And of these users barely anyone uses this unit at > all. I really would like to get these drivers mainline so others can use > it. But after 1 year and 7 versions of this series I don't want to put > a lot of work into these drivers. I think there are other components in > the kernel where the time is better used. I agree with Markus here. It would be really nice to have touchscreen support running in mainline kernel on mx25. -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 03/03/15 07:58, Markus Pargmann wrote: > This documentation describes the devicetree bindings for the > ADC/Touchscreen unit of the i.MX25 SoC. > > Signed-off-by: Markus Pargmann <mpa@pengutronix.de> Straight forward and sensible. Acked-by: Jonathan Cameron <jic23@kernel.org> > --- > > Notes: > Changes in v6: > - Removed adc-ref property and replaced it with refp and refn for positive and > negative references. The properties are optional now as the default > behaviour is a positive internal reference voltage and ADC GND as negative > reference. > > .../devicetree/bindings/mfd/fsl-imx25-tsadc.txt | 46 ++++++++++++++++++++++ > 1 file changed, 46 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt > > diff --git a/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt b/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt > new file mode 100644 > index 000000000000..a857af0eb68c > --- /dev/null > +++ b/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt > @@ -0,0 +1,46 @@ > +Freescale mx25 ADC/TSC multifunction device > + > +This device combines two general purpose conversion queues one used for general > +ADC and the other used for touchscreens. > + > +Required properties: > + - compatible: Should be "fsl,imx25-tsadc". > + - reg: Memory range of the device. > + - interrupts: Interrupt for this device as described in > + interrupts/interrupts.txt > + - clocks: An 'ipg' clock defined as described in clocks/clock.txt > + - interrupt-controller: This device is an interrupt controller. It controls > + the interrupts of both conversion queues. > + - #interrupt-cells: Should be '<1>'. > + - #address-cells: Should be '<1>'. > + - #size-cells: Should be '<1>'. > + - ranges > + > +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: > + tscadc: tscadc@50030000 { > + compatible = "fsl,imx25-tsadc"; > + reg = <0x50030000 0xc>; > + interrupts = <46>; > + clocks = <&clks 119>; > + clock-names = "ipg"; > + interrupt-controller; > + #interrupt-cells = <1>; > + #address-cells = <1>; > + #size-cells = <1>; > + ranges; > + > + tsc: tcq@50030400 { > + compatible = "fsl,imx25-tcq"; > + reg = <0x50030400 0x60>; > + ... > + }; > + > + adc: gcq@50030800 { > + compatible = "fsl,imx25-gcq"; > + reg = <0x50030800 0x60>; > + ... > + }; > + }; > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 05/03/15 07:12, Markus Pargmann wrote: > Hi, > > On Tue, Mar 03, 2015 at 10:02:12AM +0100, Arnd Bergmann wrote: >> On Tuesday 03 March 2015 08:58:11 Markus Pargmann wrote: >>> +Example: >>> + tscadc: tscadc@50030000 { >>> + compatible = "fsl,imx25-tsadc"; >>> + reg = <0x50030000 0xc>; >>> + interrupts = <46>; >>> + clocks = <&clks 119>; >>> + clock-names = "ipg"; >>> + interrupt-controller; >>> + #interrupt-cells = <1>; >>> + #address-cells = <1>; >>> + #size-cells = <1>; >>> + ranges; >>> + >>> + tsc: tcq@50030400 { >>> + compatible = "fsl,imx25-tcq"; >>> + reg = <0x50030400 0x60>; >>> + ... >>> + }; >>> + >>> + adc: gcq@50030800 { >>> + compatible = "fsl,imx25-gcq"; >>> + reg = <0x50030800 0x60>; >>> + ... >>> + }; >>> + }; >>> >> >> I wonder if we should just treat this MFD as a single IIO device >> that also registers to the input layer. >> >> Are there any other registers in the 0x50030000-0x50031000 >> range, or could the fsl,imx25-tcq and fsl,imx25-gcq devices >> be reused outside of a fsl,imx25-tsadc device? > > There are no other registers in this range. The tcq and gcq devices can > not be used outside of the tsadc. gcq and tcq are identical units so it > may work to use both of them as gcq for example but nothing else. > > It may work to have this as single IIO device. However this would be a > major rework of this series. There are a lot less users of imx25 than > imx6 for example. And of these users barely anyone uses this unit at > all. I really would like to get these drivers mainline so others can use > it. But after 1 year and 7 versions of this series I don't want to put > a lot of work into these drivers. I think there are other components in > the kernel where the time is better used. > > Best Regards, > > Markus > I was pretty much against the IIO driver registering with input at least where it was vaguely separable. Pushed a few drivers in this direction. Slightly more code, but often these devices are pretty separable (even if like here it's two identical hardware blocks) and we normally get a whole chunk of touch screen specific magic hardware that isn't of general use. It would be lovely to try and generalize some of this stuff and have the touchscreen driver act as a client of IIO, but the hardware is too fiddly for it to be obvious how to do it so far. Jonathan -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt b/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt new file mode 100644 index 000000000000..a857af0eb68c --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt @@ -0,0 +1,46 @@ +Freescale mx25 ADC/TSC multifunction device + +This device combines two general purpose conversion queues one used for general +ADC and the other used for touchscreens. + +Required properties: + - compatible: Should be "fsl,imx25-tsadc". + - reg: Memory range of the device. + - interrupts: Interrupt for this device as described in + interrupts/interrupts.txt + - clocks: An 'ipg' clock defined as described in clocks/clock.txt + - interrupt-controller: This device is an interrupt controller. It controls + the interrupts of both conversion queues. + - #interrupt-cells: Should be '<1>'. + - #address-cells: Should be '<1>'. + - #size-cells: Should be '<1>'. + - ranges + +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: + tscadc: tscadc@50030000 { + compatible = "fsl,imx25-tsadc"; + reg = <0x50030000 0xc>; + interrupts = <46>; + clocks = <&clks 119>; + clock-names = "ipg"; + interrupt-controller; + #interrupt-cells = <1>; + #address-cells = <1>; + #size-cells = <1>; + ranges; + + tsc: tcq@50030400 { + compatible = "fsl,imx25-tcq"; + reg = <0x50030400 0x60>; + ... + }; + + adc: gcq@50030800 { + compatible = "fsl,imx25-gcq"; + reg = <0x50030800 0x60>; + ... + }; + };
This documentation describes the devicetree bindings for the ADC/Touchscreen unit of the i.MX25 SoC. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> --- Notes: Changes in v6: - Removed adc-ref property and replaced it with refp and refn for positive and negative references. The properties are optional now as the default behaviour is a positive internal reference voltage and ADC GND as negative reference. .../devicetree/bindings/mfd/fsl-imx25-tsadc.txt | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt