[PATCH v9 0/8] imx25 adc and touchscreen driver

[PATCH v9 0/8] imx25 adc and touchscreen driver

[Markus Pargmann]

Hi,

another larger restructuring of the touchscreen driver and some smaller
changes in other parts. The changes are noted below each patch description.

Best Regards,

Markus


Denis Carikli (2):
  ARM: dts: imx25: Add TSC and ADC support
  ARM: imx_v4_v5_defconfig: Add I.MX25 Touchscreen controller and ADC
    support.

Markus Pargmann (6):
  ARM: dt: Binding documentation for imx25 ADC/TSC
  ARM: dt: Binding documentation for imx25 GCQ
  ARM: dt: Binding documentation for imx25 touchscreen controller
  mfd: fsl imx25 Touchscreen ADC driver
  iio: adc: fsl,imx25-gcq driver
  input: touchscreen: imx25 tcq driver

 .../devicetree/bindings/iio/adc/fsl,imx25-gcq.txt  |  58 ++
 .../bindings/input/touchscreen/fsl-mx25-tcq.txt    |  35 ++
 .../devicetree/bindings/mfd/fsl-imx25-tsadc.txt    |  47 ++
 arch/arm/boot/dts/imx25.dtsi                       |  29 +-
 arch/arm/configs/imx_v4_v5_defconfig               |   4 +
 drivers/iio/adc/Kconfig                            |   7 +
 drivers/iio/adc/Makefile                           |   1 +
 drivers/iio/adc/fsl-imx25-gcq.c                    | 415 ++++++++++++++
 drivers/input/touchscreen/Kconfig                  |   9 +
 drivers/input/touchscreen/Makefile                 |   1 +
 drivers/input/touchscreen/fsl-imx25-tcq.c          | 596 +++++++++++++++++++++
 drivers/mfd/Kconfig                                |   9 +
 drivers/mfd/Makefile                               |   2 +
 drivers/mfd/fsl-imx25-tsadc.c                      | 203 +++++++
 include/dt-bindings/iio/adc/fsl-imx25-gcq.h        |  18 +
 include/linux/mfd/imx25-tsadc.h                    | 140 +++++
 16 files changed, 1571 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
 create mode 100644 Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt
 create mode 100644 drivers/iio/adc/fsl-imx25-gcq.c
 create mode 100644 drivers/input/touchscreen/fsl-imx25-tcq.c
 create mode 100644 drivers/mfd/fsl-imx25-tsadc.c
 create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h
 create mode 100644 include/linux/mfd/imx25-tsadc.h

-- 
2.6.2

[PATCH v9 1/8] ARM: dt: Binding documentation for imx25 ADC/TSC

[Markus Pargmann]

This documentation describes the devicetree bindings for the
ADC/Touchscreen unit of the i.MX25 SoC.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
---

Notes:
    Changes in v9:
     - Fixed some style things.
    
    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    | 47 ++++++++++++++++++++++
 1 file changed, 47 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..b03505286997
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/fsl-imx25-tsadc.txt
@@ -0,0 +1,47 @@
+Freescale MX25 ADC/TSC MultiFunction Device (MFD)
+
+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:				Start address and size of the memory area of
+ 					the device
+ - interrupts:			Interrupt for this device
+					(See: ../interrupt-controller/interrupts.txt)
+ - clocks:			An 'ipg' clock (See: ../clock/clock-bindings.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>'.
+
+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>;
+			...
+		};
+	};
-- 
2.6.2

[PATCH v9 2/8] ARM: dt: Binding documentation for imx25 GCQ

[Markus Pargmann]

The documentation describes the bindings for the imx25 GCQ unit which is
essentially a generic conversion queue using the imx25 ADC.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---

Notes:
    Changes in v9:
     - Added the dt-bindings header to this patch instead of the driver
    
    Changes in v6:
     - Changed bindings to use adc-refp and adc-refn. Also a bit of cleanup in the
       setup routine.
    
    Changes in v5:
     - Fixed locking
     - Removed module owner

 .../devicetree/bindings/iio/adc/fsl,imx25-gcq.txt  | 58 ++++++++++++++++++++++
 include/dt-bindings/iio/adc/fsl-imx25-gcq.h        | 18 +++++++
 2 files changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
 create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h

diff --git a/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
new file mode 100644
index 000000000000..b0866d36a307
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
@@ -0,0 +1,58 @@
+Freescale i.MX25 ADC GCQ device
+
+This is a generic conversion queue device that can convert any of the
+analog inputs using the ADC unit of the i.MX25.
+
+Required properties:
+ - compatible: Should be "fsl,imx25-gcq".
+ - reg: Should be the register range of the module.
+ - interrupts: Should be the interrupt number of the module.
+   Typically this is <1>.
+ - interrupt-parent: phandle to the tsadc module of the i.MX25.
+ - #address-cells: Should be <1> (setting for the subnodes)
+ - #size-cells: Should be <0> (setting for the subnodes)
+
+Optional properties:
+ - vref-ext-supply: The regulator supplying the ADC reference voltage.
+   Required when at least one subnode uses the this reference.
+ - vref-xp-supply: The regulator supplying the ADC reference voltage on pin XP.
+   Required when at least one subnode uses this reference.
+ - vref-yp-supply: The regulator supplying the ADC reference voltage on pin YP.
+   Required when at least one subnode uses this reference.
+
+Sub-nodes:
+Optionally you can define subnodes which define the reference voltage
+for the analog inputs.
+
+Required properties for subnodes:
+ - reg: Should be the number of the analog input.
+     0: xp
+     1: yp
+     2: xn
+     3: yn
+     4: wiper
+     5: inaux0
+     6: inaux1
+     7: inaux2
+Optional properties for subnodes:
+ - fsl,adc-refp: specifies the positive reference input as defined in
+     <dt-bindings/iio/adc/fsl-imx25-gcq.h>
+ - fsl,adc-refn: specifies the negative reference input as defined in
+     <dt-bindings/iio/adc/fsl-imx25-gcq.h>
+
+Example:
+
+	adc: adc@50030800 {
+		compatible = "fsl,imx25-gcq";
+		reg = <0x50030800 0x60>;
+		interrupt-parent = <&tscadc>;
+		interrupts = <1>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		inaux@5 {
+			reg = <5>;
+			fsl,adc-refp = <MX25_ADC_REFP_INT>;
+			fsl,adc-refn = <MX25_ADC_REFN_NGND>;
+		};
+	};
diff --git a/include/dt-bindings/iio/adc/fsl-imx25-gcq.h b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
new file mode 100644
index 000000000000..87abdd4a7674
--- /dev/null
+++ b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
@@ -0,0 +1,18 @@
+/*
+ * This header provides constants for configuring the I.MX25 ADC
+ */
+
+#ifndef _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
+#define _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
+
+#define MX25_ADC_REFP_YP	0 /* YP voltage reference */
+#define MX25_ADC_REFP_XP	1 /* XP voltage reference */
+#define MX25_ADC_REFP_EXT	2 /* External voltage reference */
+#define MX25_ADC_REFP_INT	3 /* Internal voltage reference */
+
+#define MX25_ADC_REFN_XN	0 /* XN ground reference */
+#define MX25_ADC_REFN_YN	1 /* YN ground reference */
+#define MX25_ADC_REFN_NGND	2 /* Internal ground reference */
+#define MX25_ADC_REFN_NGND2	3 /* External ground reference */
+
+#endif
-- 
2.6.2

Re: [PATCH v9 2/8] ARM: dt: Binding documentation for imx25 GCQ

[Rob Herring]

On Sun, Dec 06, 2015 at 08:52:15PM +0100, Markus Pargmann wrote:
> The documentation describes the bindings for the imx25 GCQ unit which is
> essentially a generic conversion queue using the imx25 ADC.
> 
> Signed-off-by: Markus Pargmann <mpa@pengutronix.de>

Acked-by: Rob Herring <robh@kernel.org>

> ---
> 
> Notes:
>     Changes in v9:
>      - Added the dt-bindings header to this patch instead of the driver
>     
>     Changes in v6:
>      - Changed bindings to use adc-refp and adc-refn. Also a bit of cleanup in the
>        setup routine.
>     
>     Changes in v5:
>      - Fixed locking
>      - Removed module owner
> 
>  .../devicetree/bindings/iio/adc/fsl,imx25-gcq.txt  | 58 ++++++++++++++++++++++
>  include/dt-bindings/iio/adc/fsl-imx25-gcq.h        | 18 +++++++
>  2 files changed, 76 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
>  create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
> new file mode 100644
> index 000000000000..b0866d36a307
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
> @@ -0,0 +1,58 @@
> +Freescale i.MX25 ADC GCQ device
> +
> +This is a generic conversion queue device that can convert any of the
> +analog inputs using the ADC unit of the i.MX25.
> +
> +Required properties:
> + - compatible: Should be "fsl,imx25-gcq".
> + - reg: Should be the register range of the module.
> + - interrupts: Should be the interrupt number of the module.
> +   Typically this is <1>.
> + - interrupt-parent: phandle to the tsadc module of the i.MX25.
> + - #address-cells: Should be <1> (setting for the subnodes)
> + - #size-cells: Should be <0> (setting for the subnodes)
> +
> +Optional properties:
> + - vref-ext-supply: The regulator supplying the ADC reference voltage.
> +   Required when at least one subnode uses the this reference.
> + - vref-xp-supply: The regulator supplying the ADC reference voltage on pin XP.
> +   Required when at least one subnode uses this reference.
> + - vref-yp-supply: The regulator supplying the ADC reference voltage on pin YP.
> +   Required when at least one subnode uses this reference.
> +
> +Sub-nodes:
> +Optionally you can define subnodes which define the reference voltage
> +for the analog inputs.
> +
> +Required properties for subnodes:
> + - reg: Should be the number of the analog input.
> +     0: xp
> +     1: yp
> +     2: xn
> +     3: yn
> +     4: wiper
> +     5: inaux0
> +     6: inaux1
> +     7: inaux2
> +Optional properties for subnodes:
> + - fsl,adc-refp: specifies the positive reference input as defined in
> +     <dt-bindings/iio/adc/fsl-imx25-gcq.h>
> + - fsl,adc-refn: specifies the negative reference input as defined in
> +     <dt-bindings/iio/adc/fsl-imx25-gcq.h>
> +
> +Example:
> +
> +	adc: adc@50030800 {
> +		compatible = "fsl,imx25-gcq";
> +		reg = <0x50030800 0x60>;
> +		interrupt-parent = <&tscadc>;
> +		interrupts = <1>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		inaux@5 {
> +			reg = <5>;
> +			fsl,adc-refp = <MX25_ADC_REFP_INT>;
> +			fsl,adc-refn = <MX25_ADC_REFN_NGND>;
> +		};
> +	};
> diff --git a/include/dt-bindings/iio/adc/fsl-imx25-gcq.h b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
> new file mode 100644
> index 000000000000..87abdd4a7674
> --- /dev/null
> +++ b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
> @@ -0,0 +1,18 @@
> +/*
> + * This header provides constants for configuring the I.MX25 ADC
> + */
> +
> +#ifndef _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
> +#define _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
> +
> +#define MX25_ADC_REFP_YP	0 /* YP voltage reference */
> +#define MX25_ADC_REFP_XP	1 /* XP voltage reference */
> +#define MX25_ADC_REFP_EXT	2 /* External voltage reference */
> +#define MX25_ADC_REFP_INT	3 /* Internal voltage reference */
> +
> +#define MX25_ADC_REFN_XN	0 /* XN ground reference */
> +#define MX25_ADC_REFN_YN	1 /* YN ground reference */
> +#define MX25_ADC_REFN_NGND	2 /* Internal ground reference */
> +#define MX25_ADC_REFN_NGND2	3 /* External ground reference */
> +
> +#endif
> -- 
> 2.6.2
> 
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Re: [PATCH v9 2/8] ARM: dt: Binding documentation for imx25 GCQ

[Jonathan Cameron]

On 07/12/15 17:39, Rob Herring wrote:
> On Sun, Dec 06, 2015 at 08:52:15PM +0100, Markus Pargmann wrote:
>> The documentation describes the bindings for the imx25 GCQ unit which is
>> essentially a generic conversion queue using the imx25 ADC.
>>
>> Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> 
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Acked-by: Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> 
>> ---
>>
>> Notes:
>>     Changes in v9:
>>      - Added the dt-bindings header to this patch instead of the driver
>>     
>>     Changes in v6:
>>      - Changed bindings to use adc-refp and adc-refn. Also a bit of cleanup in the
>>        setup routine.
>>     
>>     Changes in v5:
>>      - Fixed locking
>>      - Removed module owner
>>
>>  .../devicetree/bindings/iio/adc/fsl,imx25-gcq.txt  | 58 ++++++++++++++++++++++
>>  include/dt-bindings/iio/adc/fsl-imx25-gcq.h        | 18 +++++++
>>  2 files changed, 76 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
>>  create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h
>>
>> diff --git a/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
>> new file mode 100644
>> index 000000000000..b0866d36a307
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
>> @@ -0,0 +1,58 @@
>> +Freescale i.MX25 ADC GCQ device
>> +
>> +This is a generic conversion queue device that can convert any of the
>> +analog inputs using the ADC unit of the i.MX25.
>> +
>> +Required properties:
>> + - compatible: Should be "fsl,imx25-gcq".
>> + - reg: Should be the register range of the module.
>> + - interrupts: Should be the interrupt number of the module.
>> +   Typically this is <1>.
>> + - interrupt-parent: phandle to the tsadc module of the i.MX25.
>> + - #address-cells: Should be <1> (setting for the subnodes)
>> + - #size-cells: Should be <0> (setting for the subnodes)
>> +
>> +Optional properties:
>> + - vref-ext-supply: The regulator supplying the ADC reference voltage.
>> +   Required when at least one subnode uses the this reference.
>> + - vref-xp-supply: The regulator supplying the ADC reference voltage on pin XP.
>> +   Required when at least one subnode uses this reference.
>> + - vref-yp-supply: The regulator supplying the ADC reference voltage on pin YP.
>> +   Required when at least one subnode uses this reference.
>> +
>> +Sub-nodes:
>> +Optionally you can define subnodes which define the reference voltage
>> +for the analog inputs.
>> +
>> +Required properties for subnodes:
>> + - reg: Should be the number of the analog input.
>> +     0: xp
>> +     1: yp
>> +     2: xn
>> +     3: yn
>> +     4: wiper
>> +     5: inaux0
>> +     6: inaux1
>> +     7: inaux2
>> +Optional properties for subnodes:
>> + - fsl,adc-refp: specifies the positive reference input as defined in
>> +     <dt-bindings/iio/adc/fsl-imx25-gcq.h>
>> + - fsl,adc-refn: specifies the negative reference input as defined in
>> +     <dt-bindings/iio/adc/fsl-imx25-gcq.h>
>> +
>> +Example:
>> +
>> +	adc: adc@50030800 {
>> +		compatible = "fsl,imx25-gcq";
>> +		reg = <0x50030800 0x60>;
>> +		interrupt-parent = <&tscadc>;
>> +		interrupts = <1>;
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +
>> +		inaux@5 {
>> +			reg = <5>;
>> +			fsl,adc-refp = <MX25_ADC_REFP_INT>;
>> +			fsl,adc-refn = <MX25_ADC_REFN_NGND>;
>> +		};
>> +	};
>> diff --git a/include/dt-bindings/iio/adc/fsl-imx25-gcq.h b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
>> new file mode 100644
>> index 000000000000..87abdd4a7674
>> --- /dev/null
>> +++ b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
>> @@ -0,0 +1,18 @@
>> +/*
>> + * This header provides constants for configuring the I.MX25 ADC
>> + */
>> +
>> +#ifndef _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
>> +#define _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
>> +
>> +#define MX25_ADC_REFP_YP	0 /* YP voltage reference */
>> +#define MX25_ADC_REFP_XP	1 /* XP voltage reference */
>> +#define MX25_ADC_REFP_EXT	2 /* External voltage reference */
>> +#define MX25_ADC_REFP_INT	3 /* Internal voltage reference */
>> +
>> +#define MX25_ADC_REFN_XN	0 /* XN ground reference */
>> +#define MX25_ADC_REFN_YN	1 /* YN ground reference */
>> +#define MX25_ADC_REFN_NGND	2 /* Internal ground reference */
>> +#define MX25_ADC_REFN_NGND2	3 /* External ground reference */
>> +
>> +#endif
>> -- 
>> 2.6.2
>>
>> --
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> 

[PATCH v9 3/8] ARM: dt: Binding documentation for imx25 touchscreen controller

[Markus Pargmann]

This is the touchscreen conversion queue binding documentation. It uses
the shared imx25 ADC.

Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---

Notes:
    Changes in v9:
     - Updated binding descriptions
    
    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    | 35 ++++++++++++++++++++++
 1 file changed, 35 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..d45e50872114
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
@@ -0,0 +1,35 @@
+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. This is a value
+   between 1 and 4096. It is the ratio between the internal reference voltage
+   and the measured voltage after the plate was precharged. Resistence between
+   plates and therefore the voltage decreases with pressure so that a smaller
+   value is equivalent to a higher pressure.
+ - fsl,settling-time: Settling time in nanoseconds. The settling time is before
+   the actual touch detection to wait for an even charge distribution in the
+   plate.
+
+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>;
+	};
-- 
2.6.2

Re: [PATCH v9 3/8] ARM: dt: Binding documentation for imx25 touchscreen controller

[Rob Herring]

On Sun, Dec 06, 2015 at 08:52:16PM +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 v9:
>      - Updated binding descriptions
>     
>     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    | 35 ++++++++++++++++++++++
>  1 file changed, 35 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..d45e50872114
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
> @@ -0,0 +1,35 @@
> +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.

This and ...

> + - fsl,pen-threshold: Pen-down threshold for the touchscreen. This is a value
> +   between 1 and 4096. It is the ratio between the internal reference voltage
> +   and the measured voltage after the plate was precharged. Resistence between
> +   plates and therefore the voltage decreases with pressure so that a smaller
> +   value is equivalent to a higher pressure.
> + - fsl,settling-time: Settling time in nanoseconds. The settling time is before
> +   the actual touch detection to wait for an even charge distribution in the
> +   plate.

... this still need units (-ns) appended to the property name.

> +
> +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>;
> +	};
> -- 
> 2.6.2
> 
> --
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> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v9 3/8] ARM: dt: Binding documentation for imx25 touchscreen controller

[Markus Pargmann]

[-- Attachment #1: Type: text/plain, Size: 3027 bytes --]

Hi,

On Monday 07 December 2015 14:45:46 Rob Herring wrote:
> On Sun, Dec 06, 2015 at 08:52:16PM +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 v9:
> >      - Updated binding descriptions
> >     
> >     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    | 35 ++++++++++++++++++++++
> >  1 file changed, 35 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..d45e50872114
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
> > @@ -0,0 +1,35 @@
> > +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.
> 
> This and ...
> 
> > + - fsl,pen-threshold: Pen-down threshold for the touchscreen. This is a value
> > +   between 1 and 4096. It is the ratio between the internal reference voltage
> > +   and the measured voltage after the plate was precharged. Resistence between
> > +   plates and therefore the voltage decreases with pressure so that a smaller
> > +   value is equivalent to a higher pressure.
> > + - fsl,settling-time: Settling time in nanoseconds. The settling time is before
> > +   the actual touch detection to wait for an even charge distribution in the
> > +   plate.
> 
> ... this still need units (-ns) appended to the property name.

Thanks. I wasn't aware that the property names itself should include the units.
Will fix that.

Best Regards,

Markus

-- 
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 |

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

[PATCH v9 4/8] mfd: fsl imx25 Touchscreen ADC driver

[Markus Pargmann]

This is the core driver for imx25 touchscreen/adc driver. The module
has one shared ADC and two different conversion queues which use the
ADC. The two queues are identical. Both can be used for general purpose
ADC but one is meant to be used for touchscreens.

This driver is the core which manages the central components and
registers of the TSC/ADC unit. It manages the IRQs and forwards them to
the correct components.

Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Signed-off-by: Denis Carikli <denis-fO0SIAKYzcbQT0dZR+AlfA@public.gmane.org>

[ensure correct ADC clock depending on the IPG clock]
Signed-off-by: Juergen Borleis <jbe-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Acked-by: Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---

Notes:
    Changes in v7:
     - Cleanup bit defines in header files to be more readable
     - Fix irq check to return with an error for irq <= 0
     - Add COMPILE_TEST in Kconfig file
    
    Changes in v5:
     - Remove ifdef CONFIG_OF as this driver is only for DT usage
     - Remove module owner
     - Add Kconfig dependencies ARCH_MX25 and OF

 drivers/mfd/Kconfig             |   9 ++
 drivers/mfd/Makefile            |   2 +
 drivers/mfd/fsl-imx25-tsadc.c   | 203 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/imx25-tsadc.h | 140 +++++++++++++++++++++++++++
 4 files changed, 354 insertions(+)
 create mode 100644 drivers/mfd/fsl-imx25-tsadc.c
 create mode 100644 include/linux/mfd/imx25-tsadc.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 4d92df6ef9fe..4222e202ad2b 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -271,6 +271,15 @@ config MFD_MC13XXX_I2C
 	help
 	  Select this if your MC13xxx is connected via an I2C bus.
 
+config MFD_MX25_TSADC
+	tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
+	select REGMAP_MMIO
+	depends on (SOC_IMX25 && OF) || COMPILE_TEST
+	help
+	  Enable support for the integrated Touchscreen and ADC unit of the
+	  i.MX25 processors. They consist of a conversion queue for general
+	  purpose ADC and a queue for Touchscreens.
+
 config MFD_HI6421_PMIC
 	tristate "HiSilicon Hi6421 PMU/Codec IC"
 	depends on OF
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index a8b76b81b467..5741be88c173 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -81,6 +81,8 @@ obj-$(CONFIG_TWL4030_POWER)    += twl4030-power.o
 obj-$(CONFIG_MFD_TWL4030_AUDIO)	+= twl4030-audio.o
 obj-$(CONFIG_TWL6040_CORE)	+= twl6040.o
 
+obj-$(CONFIG_MFD_MX25_TSADC)	+= fsl-imx25-tsadc.o
+
 obj-$(CONFIG_MFD_MC13XXX)	+= mc13xxx-core.o
 obj-$(CONFIG_MFD_MC13XXX_SPI)	+= mc13xxx-spi.o
 obj-$(CONFIG_MFD_MC13XXX_I2C)	+= mc13xxx-i2c.o
diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c
new file mode 100644
index 000000000000..77b2675cf8f5
--- /dev/null
+++ b/drivers/mfd/fsl-imx25-tsadc.c
@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdesc.h>
+#include <linux/irqdomain.h>
+#include <linux/irq.h>
+#include <linux/mfd/imx25-tsadc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static struct regmap_config mx25_tsadc_regmap_config = {
+	.fast_io = true,
+	.max_register = 8,
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static void mx25_tsadc_irq_handler(struct irq_desc *desc)
+{
+	struct mx25_tsadc *tsadc = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	u32 status;
+
+	chained_irq_enter(chip, desc);
+
+	regmap_read(tsadc->regs, MX25_TSC_TGSR, &status);
+
+	if (status & MX25_TGSR_GCQ_INT)
+		generic_handle_irq(irq_find_mapping(tsadc->domain, 1));
+
+	if (status & MX25_TGSR_TCQ_INT)
+		generic_handle_irq(irq_find_mapping(tsadc->domain, 0));
+
+	chained_irq_exit(chip, desc);
+}
+
+static int mx25_tsadc_domain_map(struct irq_domain *d, unsigned int irq,
+				 irq_hw_number_t hwirq)
+{
+	struct mx25_tsadc *tsadc = d->host_data;
+
+	irq_set_chip_data(irq, tsadc);
+	irq_set_chip_and_handler(irq, &dummy_irq_chip,
+				 handle_level_irq);
+	irq_modify_status(irq, IRQ_NOREQUEST, IRQ_NOPROBE);
+
+	return 0;
+}
+
+static struct irq_domain_ops mx25_tsadc_domain_ops = {
+	.map = mx25_tsadc_domain_map,
+	.xlate = irq_domain_xlate_onecell,
+};
+
+static int mx25_tsadc_setup_irq(struct platform_device *pdev,
+				struct mx25_tsadc *tsadc)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	int irq;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(dev, "Failed to get irq\n");
+		return irq;
+	}
+
+	tsadc->domain = irq_domain_add_simple(np, 2, 0, &mx25_tsadc_domain_ops,
+					      tsadc);
+	if (!tsadc->domain) {
+		dev_err(dev, "Failed to add irq domain\n");
+		return -ENOMEM;
+	}
+
+	irq_set_chained_handler(irq, mx25_tsadc_irq_handler);
+	irq_set_handler_data(irq, tsadc);
+
+	return 0;
+}
+
+static void mx25_tsadc_setup_clk(struct platform_device *pdev,
+				 struct mx25_tsadc *tsadc)
+{
+	unsigned clk_div;
+
+	/*
+	 * According to the datasheet the ADC clock should never
+	 * exceed 1,75 MHz. Base clock is the IPG and the ADC unit uses
+	 * a funny clock divider. To keep the ADC conversion time constant
+	 * adapt the ADC internal clock divider to the IPG clock rate.
+	 */
+
+	dev_dbg(&pdev->dev, "Found master clock at %lu Hz\n",
+		clk_get_rate(tsadc->clk));
+
+	clk_div = DIV_ROUND_UP(clk_get_rate(tsadc->clk), 1750000);
+	dev_dbg(&pdev->dev, "Setting up ADC clock divider to %u\n", clk_div);
+
+	/* adc clock = IPG clock / (2 * div + 2) */
+	clk_div -= 2;
+	clk_div /= 2;
+
+	/*
+	 * the ADC clock divider changes its behaviour when values below 4
+	 * are used: it is fixed to "/ 10" in this case
+	 */
+	clk_div = max_t(unsigned, 4, clk_div);
+
+	dev_dbg(&pdev->dev, "Resulting ADC conversion clock at %lu Hz\n",
+		clk_get_rate(tsadc->clk) / (2 * clk_div + 2));
+
+	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR,
+			   MX25_TGCR_ADCCLKCFG(0x1f),
+			   MX25_TGCR_ADCCLKCFG(clk_div));
+}
+
+static int mx25_tsadc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct mx25_tsadc *tsadc;
+	struct resource *res;
+	int ret;
+	void __iomem *iomem;
+
+	tsadc = devm_kzalloc(dev, sizeof(*tsadc), GFP_KERNEL);
+	if (!tsadc)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iomem = devm_ioremap_resource(dev, res);
+	if (IS_ERR(iomem))
+		return PTR_ERR(iomem);
+
+	tsadc->regs = devm_regmap_init_mmio(dev, iomem,
+					    &mx25_tsadc_regmap_config);
+	if (IS_ERR(tsadc->regs)) {
+		dev_err(dev, "Failed to initialize regmap\n");
+		return PTR_ERR(tsadc->regs);
+	}
+
+	tsadc->clk = devm_clk_get(dev, "ipg");
+	if (IS_ERR(tsadc->clk)) {
+		dev_err(dev, "Failed to get ipg clock\n");
+		return PTR_ERR(tsadc->clk);
+	}
+
+	/* setup clock according to the datasheet */
+	mx25_tsadc_setup_clk(pdev, tsadc);
+
+	/* Enable clock and reset the component */
+	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_CLK_EN,
+			   MX25_TGCR_CLK_EN);
+	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_TSC_RST,
+			   MX25_TGCR_TSC_RST);
+
+	/* Setup powersaving mode, but enable internal reference voltage */
+	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_POWERMODE_MASK,
+			   MX25_TGCR_POWERMODE_SAVE);
+	regmap_update_bits(tsadc->regs, MX25_TSC_TGCR, MX25_TGCR_INTREFEN,
+			   MX25_TGCR_INTREFEN);
+
+	ret = mx25_tsadc_setup_irq(pdev, tsadc);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, tsadc);
+
+	of_platform_populate(np, NULL, NULL, dev);
+
+	return 0;
+}
+
+static const struct of_device_id mx25_tsadc_ids[] = {
+	{ .compatible = "fsl,imx25-tsadc" },
+	{ /* Sentinel */ }
+};
+
+static struct platform_driver mx25_tsadc_driver = {
+	.driver = {
+		.name = "mx25-tsadc",
+		.of_match_table = of_match_ptr(mx25_tsadc_ids),
+	},
+	.probe = mx25_tsadc_probe,
+};
+module_platform_driver(mx25_tsadc_driver);
+
+MODULE_DESCRIPTION("MFD for ADC/TSC for Freescale mx25");
+MODULE_AUTHOR("Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:mx25-tsadc");
diff --git a/include/linux/mfd/imx25-tsadc.h b/include/linux/mfd/imx25-tsadc.h
new file mode 100644
index 000000000000..7fe4b8c3baac
--- /dev/null
+++ b/include/linux/mfd/imx25-tsadc.h
@@ -0,0 +1,140 @@
+#ifndef _LINUX_INCLUDE_MFD_IMX25_TSADC_H_
+#define _LINUX_INCLUDE_MFD_IMX25_TSADC_H_
+
+struct regmap;
+struct clk;
+
+struct mx25_tsadc {
+	struct regmap *regs;
+	struct irq_domain *domain;
+	struct clk *clk;
+};
+
+#define MX25_TSC_TGCR			0x00
+#define MX25_TSC_TGSR			0x04
+#define MX25_TSC_TICR			0x08
+
+/* The same register layout for TC and GC queue */
+#define MX25_ADCQ_FIFO			0x00
+#define MX25_ADCQ_CR			0x04
+#define MX25_ADCQ_SR			0x08
+#define MX25_ADCQ_MR			0x0c
+#define MX25_ADCQ_ITEM_7_0		0x20
+#define MX25_ADCQ_ITEM_15_8		0x24
+#define MX25_ADCQ_CFG(n)		(0x40 + ((n) * 0x4))
+
+#define MX25_ADCQ_MR_MASK		0xffffffff
+
+/* TGCR */
+#define MX25_TGCR_PDBTIME(x)		((x) << 25)
+#define MX25_TGCR_PDBTIME_MASK		GENMASK(31, 25)
+#define MX25_TGCR_PDBEN			BIT(24)
+#define MX25_TGCR_PDEN			BIT(23)
+#define MX25_TGCR_ADCCLKCFG(x)		((x) << 16)
+#define MX25_TGCR_GET_ADCCLK(x)		(((x) >> 16) & 0x1f)
+#define MX25_TGCR_INTREFEN		BIT(10)
+#define MX25_TGCR_POWERMODE_MASK	GENMASK(9, 8)
+#define MX25_TGCR_POWERMODE_SAVE	(1 << 8)
+#define MX25_TGCR_POWERMODE_ON		(2 << 8)
+#define MX25_TGCR_STLC			BIT(5)
+#define MX25_TGCR_SLPC			BIT(4)
+#define MX25_TGCR_FUNC_RST		BIT(2)
+#define MX25_TGCR_TSC_RST		BIT(1)
+#define MX25_TGCR_CLK_EN		BIT(0)
+
+/* TGSR */
+#define MX25_TGSR_SLP_INT		BIT(2)
+#define MX25_TGSR_GCQ_INT		BIT(1)
+#define MX25_TGSR_TCQ_INT		BIT(0)
+
+/* ADCQ_ITEM_* */
+#define _MX25_ADCQ_ITEM(item, x)	((x) << ((item) * 4))
+#define MX25_ADCQ_ITEM(item, x)		((item) >= 8 ? \
+		_MX25_ADCQ_ITEM((item) - 8, (x)) : _MX25_ADCQ_ITEM((item), (x)))
+
+/* ADCQ_FIFO (TCQFIFO and GCQFIFO) */
+#define MX25_ADCQ_FIFO_DATA(x)		(((x) >> 4) & 0xfff)
+#define MX25_ADCQ_FIFO_ID(x)		((x) & 0xf)
+
+/* ADCQ_CR (TCQR and GCQR) */
+#define MX25_ADCQ_CR_PDCFG_LEVEL	BIT(19)
+#define MX25_ADCQ_CR_PDMSK		BIT(18)
+#define MX25_ADCQ_CR_FRST		BIT(17)
+#define MX25_ADCQ_CR_QRST		BIT(16)
+#define MX25_ADCQ_CR_RWAIT_MASK		GENMASK(15, 12)
+#define MX25_ADCQ_CR_RWAIT(x)		((x) << 12)
+#define MX25_ADCQ_CR_WMRK_MASK		GENMASK(11, 8)
+#define MX25_ADCQ_CR_WMRK(x)		((x) << 8)
+#define MX25_ADCQ_CR_LITEMID_MASK	(0xf << 4)
+#define MX25_ADCQ_CR_LITEMID(x)		((x) << 4)
+#define MX25_ADCQ_CR_RPT		BIT(3)
+#define MX25_ADCQ_CR_FQS		BIT(2)
+#define MX25_ADCQ_CR_QSM_MASK		GENMASK(1, 0)
+#define MX25_ADCQ_CR_QSM_PD		0x1
+#define MX25_ADCQ_CR_QSM_FQS		0x2
+#define MX25_ADCQ_CR_QSM_FQS_PD		0x3
+
+/* ADCQ_SR (TCQSR and GCQSR) */
+#define MX25_ADCQ_SR_FDRY		BIT(15)
+#define MX25_ADCQ_SR_FULL		BIT(14)
+#define MX25_ADCQ_SR_EMPT		BIT(13)
+#define MX25_ADCQ_SR_FDN(x)		(((x) >> 8) & 0x1f)
+#define MX25_ADCQ_SR_FRR		BIT(6)
+#define MX25_ADCQ_SR_FUR		BIT(5)
+#define MX25_ADCQ_SR_FOR		BIT(4)
+#define MX25_ADCQ_SR_EOQ		BIT(1)
+#define MX25_ADCQ_SR_PD			BIT(0)
+
+/* ADCQ_MR (TCQMR and GCQMR) */
+#define MX25_ADCQ_MR_FDRY_DMA		BIT(31)
+#define MX25_ADCQ_MR_FER_DMA		BIT(22)
+#define MX25_ADCQ_MR_FUR_DMA		BIT(21)
+#define MX25_ADCQ_MR_FOR_DMA		BIT(20)
+#define MX25_ADCQ_MR_EOQ_DMA		BIT(17)
+#define MX25_ADCQ_MR_PD_DMA		BIT(16)
+#define MX25_ADCQ_MR_FDRY_IRQ		BIT(15)
+#define MX25_ADCQ_MR_FER_IRQ		BIT(6)
+#define MX25_ADCQ_MR_FUR_IRQ		BIT(5)
+#define MX25_ADCQ_MR_FOR_IRQ		BIT(4)
+#define MX25_ADCQ_MR_EOQ_IRQ		BIT(1)
+#define MX25_ADCQ_MR_PD_IRQ		BIT(0)
+
+/* ADCQ_CFG (TICR, TCC0-7,GCC0-7) */
+#define MX25_ADCQ_CFG_SETTLING_TIME(x)	((x) << 24)
+#define MX25_ADCQ_CFG_IGS		(1 << 20)
+#define MX25_ADCQ_CFG_NOS_MASK		GENMASK(19, 16)
+#define MX25_ADCQ_CFG_NOS(x)		(((x) - 1) << 16)
+#define MX25_ADCQ_CFG_WIPER		(1 << 15)
+#define MX25_ADCQ_CFG_YNLR		(1 << 14)
+#define MX25_ADCQ_CFG_YPLL_HIGH		(0 << 12)
+#define MX25_ADCQ_CFG_YPLL_OFF		(1 << 12)
+#define MX25_ADCQ_CFG_YPLL_LOW		(3 << 12)
+#define MX25_ADCQ_CFG_XNUR_HIGH		(0 << 10)
+#define MX25_ADCQ_CFG_XNUR_OFF		(1 << 10)
+#define MX25_ADCQ_CFG_XNUR_LOW		(3 << 10)
+#define MX25_ADCQ_CFG_XPUL_HIGH		(0 << 9)
+#define MX25_ADCQ_CFG_XPUL_OFF		(1 << 9)
+#define MX25_ADCQ_CFG_REFP(sel)		((sel) << 7)
+#define MX25_ADCQ_CFG_REFP_YP		MX25_ADCQ_CFG_REFP(0)
+#define MX25_ADCQ_CFG_REFP_XP		MX25_ADCQ_CFG_REFP(1)
+#define MX25_ADCQ_CFG_REFP_EXT		MX25_ADCQ_CFG_REFP(2)
+#define MX25_ADCQ_CFG_REFP_INT		MX25_ADCQ_CFG_REFP(3)
+#define MX25_ADCQ_CFG_REFP_MASK		GENMASK(8, 7)
+#define MX25_ADCQ_CFG_IN(sel)		((sel) << 4)
+#define MX25_ADCQ_CFG_IN_XP		MX25_ADCQ_CFG_IN(0)
+#define MX25_ADCQ_CFG_IN_YP		MX25_ADCQ_CFG_IN(1)
+#define MX25_ADCQ_CFG_IN_XN		MX25_ADCQ_CFG_IN(2)
+#define MX25_ADCQ_CFG_IN_YN		MX25_ADCQ_CFG_IN(3)
+#define MX25_ADCQ_CFG_IN_WIPER		MX25_ADCQ_CFG_IN(4)
+#define MX25_ADCQ_CFG_IN_AUX0		MX25_ADCQ_CFG_IN(5)
+#define MX25_ADCQ_CFG_IN_AUX1		MX25_ADCQ_CFG_IN(6)
+#define MX25_ADCQ_CFG_IN_AUX2		MX25_ADCQ_CFG_IN(7)
+#define MX25_ADCQ_CFG_REFN(sel)		((sel) << 2)
+#define MX25_ADCQ_CFG_REFN_XN		MX25_ADCQ_CFG_REFN(0)
+#define MX25_ADCQ_CFG_REFN_YN		MX25_ADCQ_CFG_REFN(1)
+#define MX25_ADCQ_CFG_REFN_NGND		MX25_ADCQ_CFG_REFN(2)
+#define MX25_ADCQ_CFG_REFN_NGND2	MX25_ADCQ_CFG_REFN(3)
+#define MX25_ADCQ_CFG_REFN_MASK		GENMASK(3, 2)
+#define MX25_ADCQ_CFG_PENIACK		(1 << 1)
+
+#endif  /* _LINUX_INCLUDE_MFD_IMX25_TSADC_H_ */
-- 
2.6.2

[PATCH v9 6/8] input: touchscreen: imx25 tcq driver

[Markus Pargmann]

This is a driver for the imx25 ADC/TSC module. It controls the
touchscreen conversion queue and creates a touchscreen input device.
The driver currently only supports 4 wire touchscreens. The driver uses
a simple conversion queue of precharge, touch detection, X measurement,
Y measurement, precharge and another touch detection.

This driver uses the regmap from the parent to setup some touch specific
settings in the core driver and setup a idle configuration with touch
detection.

Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Signed-off-by: Denis Carikli <denis-fO0SIAKYzcbQT0dZR+AlfA@public.gmane.org>

[fix clock's period calculation]
[fix calculation of the 'settling' value]
Signed-off-by: Juergen Borleis <jbe-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---

Notes:
    Changes in v9:
     - Added module description to Kconfig item
     - Fixed devm_ioremap_resource() return value check to use IS_ERR()
     - Removed return value of mx25_tcq_create_event_for_4wire()
     - Renamed most 'ret' variables through 'error'
     - Removed IRQF_ONESHOT
     - Rearranged threaded handler to not mix up samples from multiple measurements
    
    Changes in v7:
     - Moved clk_prepare_enable() and mx25_tcq_init() into mx25_tcq_open(). This
       was done to be able to use devm_request_threaded_irq().
     - Cleanup of the probe function through above change
     - Removed mx25_tcq_remove(), not necessary now

 drivers/input/touchscreen/Kconfig         |   9 +
 drivers/input/touchscreen/Makefile        |   1 +
 drivers/input/touchscreen/fsl-imx25-tcq.c | 596 ++++++++++++++++++++++++++++++
 3 files changed, 606 insertions(+)
 create mode 100644 drivers/input/touchscreen/fsl-imx25-tcq.c

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index ae33da7ab51f..873bf3697e35 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -811,6 +811,15 @@ config TOUCHSCREEN_USB_COMPOSITE
 	  To compile this driver as a module, choose M here: the
 	  module will be called usbtouchscreen.
 
+config TOUCHSCREEN_MX25
+	tristate "Freescale i.MX25 touchscreen input driver"
+	depends on MFD_MX25_TSADC
+	help
+	  Enable support for touchscreen connected to your i.MX25.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called fsl-imx25-tcq.
+
 config TOUCHSCREEN_MC13783
 	tristate "Freescale MC13783 touchscreen input driver"
 	depends on MFD_MC13XXX
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index cbaa6abb08da..77a2ac54101a 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_TOUCHSCREEN_INTEL_MID)	+= intel-mid-touch.o
 obj-$(CONFIG_TOUCHSCREEN_IPROC)		+= bcm_iproc_tsc.o
 obj-$(CONFIG_TOUCHSCREEN_LPC32XX)	+= lpc32xx_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MAX11801)	+= max11801_ts.o
+obj-$(CONFIG_TOUCHSCREEN_MX25)		+= fsl-imx25-tcq.o
 obj-$(CONFIG_TOUCHSCREEN_MC13783)	+= mc13783_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MCS5000)	+= mcs5000_ts.o
 obj-$(CONFIG_TOUCHSCREEN_MIGOR)		+= migor_ts.o
diff --git a/drivers/input/touchscreen/fsl-imx25-tcq.c b/drivers/input/touchscreen/fsl-imx25-tcq.c
new file mode 100644
index 000000000000..d1f3d7860ea5
--- /dev/null
+++ b/drivers/input/touchscreen/fsl-imx25-tcq.c
@@ -0,0 +1,596 @@
+/*
+ * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ *
+ * Based on driver from 2011:
+ *   Juergen Beisert, Pengutronix <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
+ *
+ * This is the driver for the imx25 TCQ (Touchscreen Conversion Queue)
+ * connected to the imx25 ADC.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/imx25-tsadc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static const char mx25_tcq_name[] = "mx25-tcq";
+
+enum mx25_tcq_mode {
+	MX25_TS_4WIRE,
+};
+
+struct mx25_tcq_priv {
+	struct regmap *regs;
+	struct regmap *core_regs;
+	struct input_dev *idev;
+	enum mx25_tcq_mode mode;
+	unsigned int pen_threshold;
+	unsigned int sample_count;
+	unsigned int expected_samples;
+	unsigned int pen_debounce;
+	unsigned int settling_time;
+	struct clk *clk;
+	int irq;
+	struct device *dev;
+};
+
+static struct regmap_config mx25_tcq_regconfig = {
+	.fast_io = true,
+	.max_register = 0x5c,
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static const struct of_device_id mx25_tcq_ids[] = {
+	{ .compatible = "fsl,imx25-tcq", },
+	{ /* Sentinel */ }
+};
+
+#define TSC_4WIRE_PRE_INDEX 0
+#define TSC_4WIRE_X_INDEX 1
+#define TSC_4WIRE_Y_INDEX 2
+#define TSC_4WIRE_POST_INDEX 3
+#define TSC_4WIRE_LEAVE 4
+
+#define MX25_TSC_DEF_THRESHOLD 80
+#define TSC_MAX_SAMPLES 16
+
+#define MX25_TSC_REPEAT_WAIT 14
+
+enum mx25_adc_configurations {
+	MX25_CFG_PRECHARGE = 0,
+	MX25_CFG_TOUCH_DETECT,
+	MX25_CFG_X_MEASUREMENT,
+	MX25_CFG_Y_MEASUREMENT,
+};
+
+#define MX25_PRECHARGE_VALUE (\
+			MX25_ADCQ_CFG_YPLL_OFF | \
+			MX25_ADCQ_CFG_XNUR_OFF | \
+			MX25_ADCQ_CFG_XPUL_HIGH | \
+			MX25_ADCQ_CFG_REFP_INT | \
+			MX25_ADCQ_CFG_IN_XP | \
+			MX25_ADCQ_CFG_REFN_NGND2 | \
+			MX25_ADCQ_CFG_IGS)
+
+#define MX25_TOUCH_DETECT_VALUE (\
+			MX25_ADCQ_CFG_YNLR | \
+			MX25_ADCQ_CFG_YPLL_OFF | \
+			MX25_ADCQ_CFG_XNUR_OFF | \
+			MX25_ADCQ_CFG_XPUL_OFF | \
+			MX25_ADCQ_CFG_REFP_INT | \
+			MX25_ADCQ_CFG_IN_XP | \
+			MX25_ADCQ_CFG_REFN_NGND2 | \
+			MX25_ADCQ_CFG_PENIACK)
+
+static void imx25_setup_queue_cfgs(struct mx25_tcq_priv *priv,
+				   unsigned int settling_cnt)
+{
+	u32 precharge_cfg =
+			MX25_PRECHARGE_VALUE |
+			MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt);
+	u32 touch_detect_cfg =
+			MX25_TOUCH_DETECT_VALUE |
+			MX25_ADCQ_CFG_NOS(1) |
+			MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt);
+
+	regmap_write(priv->core_regs, MX25_TSC_TICR, precharge_cfg);
+
+	/* PRECHARGE */
+	regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_PRECHARGE),
+		     precharge_cfg);
+
+	/* TOUCH_DETECT */
+	regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_TOUCH_DETECT),
+		     touch_detect_cfg);
+
+	/* X Measurement */
+	regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_X_MEASUREMENT),
+		     MX25_ADCQ_CFG_YPLL_OFF |
+		     MX25_ADCQ_CFG_XNUR_LOW |
+		     MX25_ADCQ_CFG_XPUL_HIGH |
+		     MX25_ADCQ_CFG_REFP_XP |
+		     MX25_ADCQ_CFG_IN_YP |
+		     MX25_ADCQ_CFG_REFN_XN |
+		     MX25_ADCQ_CFG_NOS(priv->sample_count) |
+		     MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt));
+
+	/* Y Measurement */
+	regmap_write(priv->regs, MX25_ADCQ_CFG(MX25_CFG_Y_MEASUREMENT),
+		     MX25_ADCQ_CFG_YNLR |
+		     MX25_ADCQ_CFG_YPLL_HIGH |
+		     MX25_ADCQ_CFG_XNUR_OFF |
+		     MX25_ADCQ_CFG_XPUL_OFF |
+		     MX25_ADCQ_CFG_REFP_YP |
+		     MX25_ADCQ_CFG_IN_XP |
+		     MX25_ADCQ_CFG_REFN_YN |
+		     MX25_ADCQ_CFG_NOS(priv->sample_count) |
+		     MX25_ADCQ_CFG_SETTLING_TIME(settling_cnt));
+
+	/* Enable the touch detection right now */
+	regmap_write(priv->core_regs, MX25_TSC_TICR, touch_detect_cfg |
+		     MX25_ADCQ_CFG_IGS);
+}
+
+static int imx25_setup_queue_4wire(struct mx25_tcq_priv *priv,
+				   unsigned settling_cnt, int *items)
+{
+	imx25_setup_queue_cfgs(priv, settling_cnt);
+
+	/* Setup the conversion queue */
+	regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,
+		     MX25_ADCQ_ITEM(0, MX25_CFG_PRECHARGE) |
+		     MX25_ADCQ_ITEM(1, MX25_CFG_TOUCH_DETECT) |
+		     MX25_ADCQ_ITEM(2, MX25_CFG_X_MEASUREMENT) |
+		     MX25_ADCQ_ITEM(3, MX25_CFG_Y_MEASUREMENT) |
+		     MX25_ADCQ_ITEM(4, MX25_CFG_PRECHARGE) |
+		     MX25_ADCQ_ITEM(5, MX25_CFG_TOUCH_DETECT));
+
+	/*
+	 * We measure X/Y with 'sample_count' number of samples and execute a
+	 * touch detection twice, with 1 sample each
+	 */
+	priv->expected_samples = priv->sample_count * 2 + 2;
+	*items = 6;
+
+	return 0;
+}
+
+static void mx25_tcq_disable_touch_irq(struct mx25_tcq_priv *priv)
+{
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_PDMSK,
+			   MX25_ADCQ_CR_PDMSK);
+}
+
+static void mx25_tcq_enable_touch_irq(struct mx25_tcq_priv *priv)
+{
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_PDMSK, 0);
+}
+
+static void mx25_tcq_disable_fifo_irq(struct mx25_tcq_priv *priv)
+{
+	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_FDRY_IRQ,
+			   MX25_ADCQ_MR_FDRY_IRQ);
+}
+
+static void mx25_tcq_enable_fifo_irq(struct mx25_tcq_priv *priv)
+{
+	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_FDRY_IRQ, 0);
+}
+
+static void mx25_tcq_force_queue_start(struct mx25_tcq_priv *priv)
+{
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
+			   MX25_ADCQ_CR_FQS,
+			   MX25_ADCQ_CR_FQS);
+}
+
+static void mx25_tcq_force_queue_stop(struct mx25_tcq_priv *priv)
+{
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
+			   MX25_ADCQ_CR_FQS, 0);
+}
+
+static void mx25_tcq_fifo_reset(struct mx25_tcq_priv *priv)
+{
+	u32 tcqcr;
+
+	regmap_read(priv->regs, MX25_ADCQ_CR, &tcqcr);
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FRST,
+			   MX25_ADCQ_CR_FRST);
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FRST, 0);
+	regmap_write(priv->regs, MX25_ADCQ_CR, tcqcr);
+}
+
+static void mx25_tcq_re_enable_touch_detection(struct mx25_tcq_priv *priv)
+{
+	/* stop the queue from looping */
+	mx25_tcq_force_queue_stop(priv);
+
+	/* for a clean touch detection, preload the X plane */
+	regmap_write(priv->core_regs, MX25_TSC_TICR, MX25_PRECHARGE_VALUE);
+
+	/* waste some time now to pre-load the X plate to high voltage */
+	mx25_tcq_fifo_reset(priv);
+
+	/* re-enable the detection right now */
+	regmap_write(priv->core_regs, MX25_TSC_TICR,
+		     MX25_TOUCH_DETECT_VALUE | MX25_ADCQ_CFG_IGS);
+
+	regmap_update_bits(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_PD,
+			   MX25_ADCQ_SR_PD);
+
+	/* enable the pen down event to be a source for the interrupt */
+	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_PD_IRQ, 0);
+
+	/* lets fire the next IRQ if someone touches the touchscreen */
+	mx25_tcq_enable_touch_irq(priv);
+}
+
+static void mx25_tcq_create_event_for_4wire(struct mx25_tcq_priv *priv,
+					    u32 *sample_buf,
+					    unsigned int samples)
+{
+	unsigned int x_pos = 0;
+	unsigned int y_pos = 0;
+	unsigned int touch_pre = 0;
+	unsigned int touch_post = 0;
+	unsigned int i;
+
+	for (i = 0; i < samples; i++) {
+		unsigned int index = MX25_ADCQ_FIFO_ID(sample_buf[i]);
+		unsigned int val = MX25_ADCQ_FIFO_DATA(sample_buf[i]);
+
+		switch (index) {
+		case 1:
+			touch_pre = val;
+			break;
+		case 2:
+			x_pos = val;
+			break;
+		case 3:
+			y_pos = val;
+			break;
+		case 5:
+			touch_post = val;
+			break;
+		default:
+			dev_dbg(priv->dev, "Dropped samples because of invalid index %d\n",
+				index);
+			return;
+		}
+	}
+
+	if (samples != 0) {
+		/*
+		 * only if both touch measures are below a threshold,
+		 * the position is valid
+		 */
+		if (touch_pre < priv->pen_threshold &&
+		    touch_post < priv->pen_threshold) {
+			/* valid samples, generate a report */
+			x_pos /= priv->sample_count;
+			y_pos /= priv->sample_count;
+			input_report_abs(priv->idev, ABS_X, x_pos);
+			input_report_abs(priv->idev, ABS_Y, y_pos);
+			input_report_key(priv->idev, BTN_TOUCH, 1);
+			input_sync(priv->idev);
+
+			/* get next sample */
+			mx25_tcq_enable_fifo_irq(priv);
+		} else if (touch_pre >= priv->pen_threshold &&
+			   touch_post >= priv->pen_threshold) {
+			/*
+			 * if both samples are invalid,
+			 * generate a release report
+			 */
+			input_report_key(priv->idev, BTN_TOUCH, 0);
+			input_sync(priv->idev);
+			mx25_tcq_re_enable_touch_detection(priv);
+		} else {
+			/*
+			 * if only one of both touch measurements are
+			 * below the threshold, still some bouncing
+			 * happens. Take additional samples in this
+			 * case to be sure
+			 */
+			mx25_tcq_enable_fifo_irq(priv);
+		}
+	}
+}
+
+static irqreturn_t mx25_tcq_irq_thread(int irq, void *dev_id)
+{
+	struct mx25_tcq_priv *priv = dev_id;
+	u32 sample_buf[TSC_MAX_SAMPLES];
+	unsigned int samples;
+	u32 stats;
+	unsigned int i;
+
+	/*
+	 * Check how many samples are available. We always have to read exactly
+	 * sample_count samples from the fifo, or a multiple of sample_count.
+	 * Otherwise we mixup samples into different touch events.
+	 */
+	regmap_read(priv->regs, MX25_ADCQ_SR, &stats);
+	samples = MX25_ADCQ_SR_FDN(stats);
+	samples -= samples % priv->sample_count;
+
+	if (!samples)
+		return IRQ_HANDLED;
+
+	for (i = 0; i != samples; ++i)
+		regmap_read(priv->regs, MX25_ADCQ_FIFO, &sample_buf[i]);
+
+	mx25_tcq_create_event_for_4wire(priv, sample_buf, samples);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mx25_tcq_irq(int irq, void *dev_id)
+{
+	struct mx25_tcq_priv *priv = dev_id;
+	u32 stat;
+	int ret = IRQ_HANDLED;
+
+	regmap_read(priv->regs, MX25_ADCQ_SR, &stat);
+
+	if (stat & (MX25_ADCQ_SR_FRR | MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR))
+		mx25_tcq_re_enable_touch_detection(priv);
+
+	if (stat & MX25_ADCQ_SR_PD) {
+		mx25_tcq_disable_touch_irq(priv);
+		mx25_tcq_force_queue_start(priv);
+		mx25_tcq_enable_fifo_irq(priv);
+	}
+
+	if (stat & MX25_ADCQ_SR_FDRY) {
+		mx25_tcq_disable_fifo_irq(priv);
+		ret = IRQ_WAKE_THREAD;
+	}
+
+	regmap_update_bits(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |
+			   MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR |
+			   MX25_ADCQ_SR_PD,
+			   MX25_ADCQ_SR_FRR | MX25_ADCQ_SR_FUR |
+			   MX25_ADCQ_SR_FOR | MX25_ADCQ_SR_PD);
+
+	return ret;
+}
+
+/* configure the state machine for a 4-wire touchscreen */
+static int mx25_tcq_init(struct mx25_tcq_priv *priv)
+{
+	u32 tgcr;
+	unsigned int ipg_div;
+	unsigned int adc_period;
+	unsigned int debounce_cnt;
+	unsigned int settling_cnt;
+	int itemct;
+	int error;
+
+	regmap_read(priv->core_regs, MX25_TSC_TGCR, &tgcr);
+	ipg_div = max_t(unsigned int, 4, MX25_TGCR_GET_ADCCLK(tgcr));
+	adc_period = USEC_PER_SEC * ipg_div * 2 + 2;
+	adc_period /= clk_get_rate(priv->clk) / 1000 + 1;
+	debounce_cnt = DIV_ROUND_UP(priv->pen_debounce, adc_period * 8) - 1;
+	settling_cnt = DIV_ROUND_UP(priv->settling_time, adc_period * 8) - 1;
+
+	/* Reset */
+	regmap_write(priv->regs, MX25_ADCQ_CR,
+		     MX25_ADCQ_CR_QRST | MX25_ADCQ_CR_FRST);
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
+			   MX25_ADCQ_CR_QRST | MX25_ADCQ_CR_FRST, 0);
+
+	/* up to 128 * 8 ADC clocks are possible */
+	if (debounce_cnt > 127)
+		debounce_cnt = 127;
+
+	/* up to 255 * 8 ADC clocks are possible */
+	if (settling_cnt > 255)
+		settling_cnt = 255;
+
+	error = imx25_setup_queue_4wire(priv, settling_cnt, &itemct);
+	if (error)
+		return error;
+
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
+			   MX25_ADCQ_CR_LITEMID_MASK | MX25_ADCQ_CR_WMRK_MASK,
+			   MX25_ADCQ_CR_LITEMID(itemct - 1) |
+			   MX25_ADCQ_CR_WMRK(priv->expected_samples - 1));
+
+	/* setup debounce count */
+	regmap_update_bits(priv->core_regs, MX25_TSC_TGCR,
+			   MX25_TGCR_PDBTIME_MASK,
+			   MX25_TGCR_PDBTIME(debounce_cnt));
+
+	/* enable debounce */
+	regmap_update_bits(priv->core_regs, MX25_TSC_TGCR, MX25_TGCR_PDBEN,
+			   MX25_TGCR_PDBEN);
+	regmap_update_bits(priv->core_regs, MX25_TSC_TGCR, MX25_TGCR_PDEN,
+			   MX25_TGCR_PDEN);
+
+	/* enable the engine on demand */
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_QSM_MASK,
+			   MX25_ADCQ_CR_QSM_FQS);
+
+	/* Enable repeat and repeat wait */
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
+			   MX25_ADCQ_CR_RPT | MX25_ADCQ_CR_RWAIT_MASK,
+			   MX25_ADCQ_CR_RPT |
+			   MX25_ADCQ_CR_RWAIT(MX25_TSC_REPEAT_WAIT));
+
+	return 0;
+}
+
+static int mx25_tcq_parse_dt(struct platform_device *pdev,
+			     struct mx25_tcq_priv *priv)
+{
+	struct device_node *np = pdev->dev.of_node;
+	u32 wires;
+	int error;
+
+	/* Setup defaults */
+	priv->pen_threshold = 500;
+	priv->sample_count = 3;
+	priv->pen_debounce = 1000000;
+	priv->settling_time = 250000;
+
+	error = of_property_read_u32(np, "fsl,wires", &wires);
+	if (error) {
+		dev_err(&pdev->dev, "Failed to find fsl,wires properties\n");
+		return error;
+	}
+
+	if (wires == 4) {
+		priv->mode = MX25_TS_4WIRE;
+	} else {
+		dev_err(&pdev->dev, "%u-wire mode not supported\n", wires);
+		return -EINVAL;
+	}
+
+	/* These are optional, we don't care about the return values */
+	of_property_read_u32(np, "fsl,pen-threshold", &priv->pen_threshold);
+	of_property_read_u32(np, "fsl,settling-time", &priv->settling_time);
+	of_property_read_u32(np, "fsl,pen-debounce", &priv->pen_debounce);
+
+	return 0;
+}
+
+static int mx25_tcq_open(struct input_dev *idev)
+{
+	struct device *dev = &idev->dev;
+	struct mx25_tcq_priv *priv = dev_get_drvdata(dev);
+	int error;
+
+	error = clk_prepare_enable(priv->clk);
+	if (error) {
+		dev_err(dev, "Failed to enable ipg clock\n");
+		return error;
+	}
+
+	error = mx25_tcq_init(priv);
+	if (error) {
+		dev_err(dev, "Failed to init tcq\n");
+		clk_disable_unprepare(priv->clk);
+		return error;
+	}
+
+	mx25_tcq_re_enable_touch_detection(priv);
+
+	return 0;
+}
+
+static void mx25_tcq_close(struct input_dev *idev)
+{
+	struct mx25_tcq_priv *priv = input_get_drvdata(idev);
+
+	mx25_tcq_force_queue_stop(priv);
+	mx25_tcq_disable_touch_irq(priv);
+	mx25_tcq_disable_fifo_irq(priv);
+	clk_disable_unprepare(priv->clk);
+}
+
+static int mx25_tcq_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct input_dev *idev;
+	struct mx25_tcq_priv *priv;
+	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);
+	struct resource *res;
+	void __iomem *mem;
+	int error;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	priv->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
+
+	error = mx25_tcq_parse_dt(pdev, priv);
+	if (error)
+		return error;
+
+	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_tcq_regconfig);
+	if (IS_ERR(priv->regs)) {
+		dev_err(dev, "Failed to initialize regmap\n");
+		return PTR_ERR(priv->regs);
+	}
+
+	priv->irq = platform_get_irq(pdev, 0);
+	if (priv->irq <= 0) {
+		dev_err(dev, "Failed to get IRQ\n");
+		return priv->irq;
+	}
+
+	idev = devm_input_allocate_device(dev);
+	if (!idev) {
+		dev_err(dev, "Failed to allocate input device\n");
+		return -ENOMEM;
+	}
+
+	idev->name = mx25_tcq_name;
+	input_set_capability(idev, EV_KEY, BTN_TOUCH);
+	input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0);
+	input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0);
+
+	idev->id.bustype = BUS_HOST;
+	idev->open = mx25_tcq_open;
+	idev->close = mx25_tcq_close;
+
+	priv->idev = idev;
+	input_set_drvdata(idev, priv);
+
+	priv->core_regs = tsadc->regs;
+	if (!priv->core_regs)
+		return -EINVAL;
+
+	priv->clk = tsadc->clk;
+	if (!priv->clk)
+		return -EINVAL;
+
+	platform_set_drvdata(pdev, priv);
+
+	error = devm_request_threaded_irq(dev, priv->irq, mx25_tcq_irq,
+					  mx25_tcq_irq_thread, 0, pdev->name,
+					  priv);
+	if (error) {
+		dev_err(dev, "Failed requesting IRQ\n");
+		return error;
+	}
+
+	error = input_register_device(idev);
+	if (error) {
+		dev_err(dev, "Failed to register input device\n");
+		return error;
+	}
+
+	return 0;
+}
+
+static struct platform_driver mx25_tcq_driver = {
+	.driver		= {
+		.name	= "mx25-tcq",
+		.of_match_table = mx25_tcq_ids,
+	},
+	.probe		= mx25_tcq_probe,
+};
+module_platform_driver(mx25_tcq_driver);
+
+MODULE_DESCRIPTION("TS input driver for Freescale mx25");
+MODULE_AUTHOR("Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>");
+MODULE_LICENSE("GPL v2");
-- 
2.6.2

[PATCH v9 5/8] iio: adc: fsl,imx25-gcq driver

[Markus Pargmann]

This is a conversion queue driver for the mx25 SoC. It uses the central
ADC which is used by two seperate independent queues. This driver
prepares different conversion configurations for each possible input.
For a conversion it creates a conversionqueue of one item with the
correct configuration for the chosen channel. It then executes the queue
once and disables the conversion queue afterwards.

The reference voltages are configurable through devicetree subnodes,
depending on the connections of the ADC inputs.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Denis Carikli <denis@eukrea.com>
---

Notes:
    Changes in v7:
     - Remove separate functions mx25_gcq_disable/enable_eoq() as they were used at
       only one position
     - Enforce an external reference regulator if one of the conversions uses it as
       reference. The devm_regulator_get() call was moved into
       mx25_gcq_setup_cfgs() to be able to acquire the reference regulator when
       necessary.
     - Store indio_dev as platform driver data instead of the private data. This
       was changed in probe() and remove().
    
    Changes in v6:
     - Added defines for a complete list of references in the dt binding macros

 drivers/iio/adc/Kconfig         |   7 +
 drivers/iio/adc/Makefile        |   1 +
 drivers/iio/adc/fsl-imx25-gcq.c | 415 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 423 insertions(+)
 create mode 100644 drivers/iio/adc/fsl-imx25-gcq.c

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 7868c744fd4b..73145c53ec2c 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -183,6 +183,13 @@ config EXYNOS_ADC
 	  To compile this driver as a module, choose M here: the module will be
 	  called exynos_adc.
 
+config FSL_MX25_ADC
+	tristate "Freescale MX25 ADC driver"
+	depends on MFD_MX25_TSADC
+	help
+	  Generic Conversion Queue driver used for general purpose ADC in the
+	  MX25. This driver supports single measurements using the MX25 ADC.
+
 config HI8435
 	tristate "Holt Integrated Circuits HI-8435 threshold detector"
 	select IIO_TRIGGERED_EVENT
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 99b37a963a1e..2fe9b78e4b02 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o
 obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o
 obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
 obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
+obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
 obj-$(CONFIG_HI8435) += hi8435.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_MAX1027) += max1027.o
diff --git a/drivers/iio/adc/fsl-imx25-gcq.c b/drivers/iio/adc/fsl-imx25-gcq.c
new file mode 100644
index 000000000000..eb9570876291
--- /dev/null
+++ b/drivers/iio/adc/fsl-imx25-gcq.c
@@ -0,0 +1,415 @@
+/*
+ * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ *
+ * This is the driver for the imx25 GCQ (Generic Conversion Queue)
+ * connected to the imx25 ADC.
+ */
+
+#include <dt-bindings/iio/adc/fsl-imx25-gcq.h>
+#include <linux/clk.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/imx25-tsadc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#define MX25_GCQ_TIMEOUT (msecs_to_jiffies(2000))
+
+static const char * const driver_name = "mx25-gcq";
+
+enum mx25_gcq_cfgs {
+	MX25_CFG_XP = 0,
+	MX25_CFG_YP,
+	MX25_CFG_XN,
+	MX25_CFG_YN,
+	MX25_CFG_WIPER,
+	MX25_CFG_INAUX0,
+	MX25_CFG_INAUX1,
+	MX25_CFG_INAUX2,
+	MX25_NUM_CFGS,
+};
+
+struct mx25_gcq_priv {
+	struct regmap *regs;
+	struct completion completed;
+	struct clk *clk;
+	int irq;
+	struct regulator *vref[4];
+	u32 channel_vref_mv[MX25_NUM_CFGS];
+};
+
+#define MX25_CQG_CHAN(chan, id) {\
+	.type = IIO_VOLTAGE,\
+	.indexed = 1,\
+	.channel = chan,\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			      BIT(IIO_CHAN_INFO_SCALE),\
+	.datasheet_name = id,\
+}
+
+static const struct iio_chan_spec mx25_gcq_channels[MX25_NUM_CFGS] = {
+	MX25_CQG_CHAN(MX25_CFG_XP, "xp"),
+	MX25_CQG_CHAN(MX25_CFG_YP, "yp"),
+	MX25_CQG_CHAN(MX25_CFG_XN, "xn"),
+	MX25_CQG_CHAN(MX25_CFG_YN, "yn"),
+	MX25_CQG_CHAN(MX25_CFG_WIPER, "wiper"),
+	MX25_CQG_CHAN(MX25_CFG_INAUX0, "inaux0"),
+	MX25_CQG_CHAN(MX25_CFG_INAUX1, "inaux1"),
+	MX25_CQG_CHAN(MX25_CFG_INAUX2, "inaux2"),
+};
+
+static const char * const mx25_gcq_refp_names[] = {
+	[MX25_ADC_REFP_YP] = "yp",
+	[MX25_ADC_REFP_XP] = "xp",
+	[MX25_ADC_REFP_INT] = "int",
+	[MX25_ADC_REFP_EXT] = "ext",
+};
+
+static irqreturn_t mx25_gcq_irq(int irq, void *data)
+{
+	struct mx25_gcq_priv *priv = data;
+	u32 stats;
+
+	regmap_read(priv->regs, MX25_ADCQ_SR, &stats);
+
+	if (stats & MX25_ADCQ_SR_EOQ) {
+		regmap_update_bits(priv->regs, MX25_ADCQ_MR,
+				   MX25_ADCQ_MR_EOQ_IRQ, MX25_ADCQ_MR_EOQ_IRQ);
+		complete(&priv->completed);
+	}
+
+	/* Disable conversion queue run */
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS, 0);
+
+	/* Acknowledge all possible irqs */
+	regmap_write(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |
+		     MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR |
+		     MX25_ADCQ_SR_EOQ | MX25_ADCQ_SR_PD);
+
+	return IRQ_HANDLED;
+}
+
+static int mx25_gcq_get_raw_value(struct device *dev,
+				  struct iio_chan_spec const *chan,
+				  struct mx25_gcq_priv *priv,
+				  int *val)
+{
+	long timeout;
+	u32 data;
+
+	/* Setup the configuration we want to use */
+	regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,
+		     MX25_ADCQ_ITEM(0, chan->channel));
+
+	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_EOQ_IRQ, 0);
+
+	/* Trigger queue for one run */
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS,
+			   MX25_ADCQ_CR_FQS);
+
+	timeout = wait_for_completion_interruptible_timeout(
+		&priv->completed, MX25_GCQ_TIMEOUT);
+	if (timeout < 0) {
+		dev_err(dev, "ADC wait for measurement failed\n");
+		return timeout;
+	} else if (timeout == 0) {
+		dev_err(dev, "ADC timed out\n");
+		return -ETIMEDOUT;
+	}
+
+	regmap_read(priv->regs, MX25_ADCQ_FIFO, &data);
+
+	*val = MX25_ADCQ_FIFO_DATA(data);
+
+	return IIO_VAL_INT;
+}
+
+static int mx25_gcq_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan, int *val,
+			     int *val2, long mask)
+{
+	struct mx25_gcq_priv *priv = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&indio_dev->mlock);
+		ret = mx25_gcq_get_raw_value(&indio_dev->dev, chan, priv, val);
+		mutex_unlock(&indio_dev->mlock);
+		return ret;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = priv->channel_vref_mv[chan->channel];
+		*val2 = 12;
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_info mx25_gcq_iio_info = {
+	.read_raw = mx25_gcq_read_raw,
+};
+
+static const struct regmap_config mx25_gcq_regconfig = {
+	.max_register = 0x5c,
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static int mx25_gcq_setup_cfgs(struct platform_device *pdev,
+			       struct mx25_gcq_priv *priv)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child;
+	struct device *dev = &pdev->dev;
+	unsigned int refp_used[4] = {};
+	int ret, i;
+
+	/*
+	 * Setup all configurations registers with a default conversion
+	 * configuration for each input
+	 */
+	for (i = 0; i < MX25_NUM_CFGS; ++i)
+		regmap_write(priv->regs, MX25_ADCQ_CFG(i),
+			     MX25_ADCQ_CFG_YPLL_OFF |
+			     MX25_ADCQ_CFG_XNUR_OFF |
+			     MX25_ADCQ_CFG_XPUL_OFF |
+			     MX25_ADCQ_CFG_REFP_INT |
+			     MX25_ADCQ_CFG_IN(i) |
+			     MX25_ADCQ_CFG_REFN_NGND2);
+
+	/*
+	 * First get all regulators to store them in channel_vref_mv if
+	 * necessary. Later we use that information for proper IIO scale
+	 * information.
+	 */
+	priv->vref[MX25_ADC_REFP_INT] = NULL;
+	priv->vref[MX25_ADC_REFP_EXT] =
+		devm_regulator_get_optional(&pdev->dev, "vref-ext");
+	priv->vref[MX25_ADC_REFP_XP] =
+		devm_regulator_get_optional(&pdev->dev, "vref-xp");
+	priv->vref[MX25_ADC_REFP_YP] =
+		devm_regulator_get_optional(&pdev->dev, "vref-yp");
+
+	for_each_child_of_node(np, child) {
+		u32 reg;
+		u32 refp = MX25_ADCQ_CFG_REFP_INT;
+		u32 refn = MX25_ADCQ_CFG_REFN_NGND2;
+
+		ret = of_property_read_u32(child, "reg", &reg);
+		if (ret) {
+			dev_err(dev, "Failed to get reg property\n");
+			return ret;
+		}
+
+		if (reg >= MX25_NUM_CFGS) {
+			dev_err(dev,
+				"reg value is greater than the number of available configuration registers\n");
+			return -EINVAL;
+		}
+
+		of_property_read_u32(child, "fsl,adc-refp", &refp);
+		of_property_read_u32(child, "fsl,adc-refn", &refn);
+
+		switch (refp) {
+		case MX25_ADC_REFP_EXT:
+		case MX25_ADC_REFP_XP:
+		case MX25_ADC_REFP_YP:
+			if (IS_ERR(priv->vref[refp])) {
+				dev_err(dev, "Error, trying to use external voltage reference without a vref-%s regulator.",
+					mx25_gcq_refp_names[refp]);
+				return PTR_ERR(priv->vref[refp]);
+			}
+			priv->channel_vref_mv[reg] =
+				regulator_get_voltage(priv->vref[refp]);
+			/* Conversion from uV to mV */
+			do_div(priv->channel_vref_mv[reg], 1000);
+			break;
+		case MX25_ADC_REFP_INT:
+			priv->channel_vref_mv[reg] = 2500;
+			break;
+		default:
+			dev_err(dev, "Invalid positive reference %d\n", refp);
+			return -EINVAL;
+		}
+
+		++refp_used[refp];
+
+		/*
+		 * Shift the read values to the correct positions within the
+		 * register.
+		 */
+		refp = MX25_ADCQ_CFG_REFP(refp);
+		refn = MX25_ADCQ_CFG_REFN(refn);
+
+		if ((refp & MX25_ADCQ_CFG_REFP_MASK) != refp) {
+			dev_err(dev, "Invalid fsl,adc-refp property value\n");
+			return -EINVAL;
+		}
+		if ((refn & MX25_ADCQ_CFG_REFN_MASK) != refn) {
+			dev_err(dev, "Invalid fsl,adc-refn property value\n");
+			return -EINVAL;
+		}
+
+		regmap_update_bits(priv->regs, MX25_ADCQ_CFG(reg),
+				   MX25_ADCQ_CFG_REFP_MASK |
+				   MX25_ADCQ_CFG_REFN_MASK,
+				   refp | refn);
+	}
+	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
+			   MX25_ADCQ_CR_FRST | MX25_ADCQ_CR_QRST,
+			   MX25_ADCQ_CR_FRST | MX25_ADCQ_CR_QRST);
+
+	regmap_write(priv->regs, MX25_ADCQ_CR,
+		     MX25_ADCQ_CR_PDMSK | MX25_ADCQ_CR_QSM_FQS);
+
+	/* Remove unused regulators */
+	for (i = 0; i != 4; ++i) {
+		if (!refp_used[i]) {
+			if (!IS_ERR_OR_NULL(priv->vref[i]))
+				devm_regulator_put(priv->vref[i]);
+			priv->vref[i] = NULL;
+		}
+	}
+
+	return 0;
+}
+
+static int mx25_gcq_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev;
+	struct mx25_gcq_priv *priv;
+	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	void __iomem *mem;
+	int ret;
+	int i;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	priv = iio_priv(indio_dev);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
+
+	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);
+	if (IS_ERR(priv->regs)) {
+		dev_err(dev, "Failed to initialize regmap\n");
+		return PTR_ERR(priv->regs);
+	}
+
+	init_completion(&priv->completed);
+
+	ret = mx25_gcq_setup_cfgs(pdev, priv);
+	if (ret)
+		return ret;
+
+	for (i = 0; i != 4; ++i) {
+		if (!priv->vref[i])
+			continue;
+
+		ret = regulator_enable(priv->vref[i]);
+		if (ret)
+			goto err_regulator_disable;
+	}
+
+	priv->clk = tsadc->clk;
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock\n");
+		goto err_vref_disable;
+	}
+
+	priv->irq = platform_get_irq(pdev, 0);
+	if (priv->irq <= 0) {
+		dev_err(dev, "Failed to get IRQ\n");
+		ret = priv->irq;
+		goto err_clk_unprepare;
+	}
+
+	ret = request_irq(priv->irq, mx25_gcq_irq, 0, pdev->name, priv);
+	if (ret) {
+		dev_err(dev, "Failed requesting IRQ\n");
+		goto err_clk_unprepare;
+	}
+
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->channels = mx25_gcq_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mx25_gcq_channels);
+	indio_dev->info = &mx25_gcq_iio_info;
+	indio_dev->name = driver_name;
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(dev, "Failed to register iio device\n");
+		goto err_irq_free;
+	}
+
+	platform_set_drvdata(pdev, indio_dev);
+
+	return 0;
+
+err_irq_free:
+	free_irq(priv->irq, (void *)priv);
+err_clk_unprepare:
+	clk_disable_unprepare(priv->clk);
+err_vref_disable:
+	i = 4;
+err_regulator_disable:
+	for (; i-- > 0;) {
+		if (priv->vref[i])
+			regulator_disable(priv->vref[i]);
+	}
+	return ret;
+}
+
+static int mx25_gcq_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct mx25_gcq_priv *priv = iio_priv(indio_dev);
+	int i;
+
+	iio_device_unregister(indio_dev);
+	free_irq(priv->irq, priv);
+	clk_disable_unprepare(priv->clk);
+	for (i = 4; i-- > 0;) {
+		if (priv->vref[i])
+			regulator_disable(priv->vref[i]);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id mx25_gcq_ids[] = {
+	{ .compatible = "fsl,imx25-gcq", },
+	{ /* Sentinel */ }
+};
+
+static struct platform_driver mx25_gcq_driver = {
+	.driver		= {
+		.name	= "mx25-gcq",
+		.of_match_table = mx25_gcq_ids,
+	},
+	.probe		= mx25_gcq_probe,
+	.remove		= mx25_gcq_remove,
+};
+module_platform_driver(mx25_gcq_driver);
+
+MODULE_DESCRIPTION("ADC driver for Freescale mx25");
+MODULE_AUTHOR("Markus Pargmann <mpa@pengutronix.de>");
+MODULE_LICENSE("GPL v2");
-- 
2.6.2

Re: [PATCH v9 5/8] iio: adc: fsl,imx25-gcq driver

[Jonathan Cameron]

On 06/12/15 19:52, Markus Pargmann wrote:
> This is a conversion queue driver for the mx25 SoC. It uses the central
> ADC which is used by two seperate independent queues. This driver
> prepares different conversion configurations for each possible input.
> For a conversion it creates a conversionqueue of one item with the
conversion queue
> correct configuration for the chosen channel. It then executes the queue
> once and disables the conversion queue afterwards.
> 
> The reference voltages are configurable through devicetree subnodes,
> depending on the connections of the ADC inputs.
> 
> Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
> Signed-off-by: Denis Carikli <denis@eukrea.com>
A couple of little bits inline.  Fix the return of 0 on fail in probe
and you can add

Acked-by: Jonathan Cameron <jic23@kernel.org>
> ---
> 
> Notes:
>     Changes in v7:
>      - Remove separate functions mx25_gcq_disable/enable_eoq() as they were used at
>        only one position
>      - Enforce an external reference regulator if one of the conversions uses it as
>        reference. The devm_regulator_get() call was moved into
>        mx25_gcq_setup_cfgs() to be able to acquire the reference regulator when
>        necessary.
>      - Store indio_dev as platform driver data instead of the private data. This
>        was changed in probe() and remove().
>     
>     Changes in v6:
>      - Added defines for a complete list of references in the dt binding macros
> 
>  drivers/iio/adc/Kconfig         |   7 +
>  drivers/iio/adc/Makefile        |   1 +
>  drivers/iio/adc/fsl-imx25-gcq.c | 415 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 423 insertions(+)
>  create mode 100644 drivers/iio/adc/fsl-imx25-gcq.c
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 7868c744fd4b..73145c53ec2c 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -183,6 +183,13 @@ config EXYNOS_ADC
>  	  To compile this driver as a module, choose M here: the module will be
>  	  called exynos_adc.
>  
> +config FSL_MX25_ADC
> +	tristate "Freescale MX25 ADC driver"
> +	depends on MFD_MX25_TSADC
> +	help
> +	  Generic Conversion Queue driver used for general purpose ADC in the
> +	  MX25. This driver supports single measurements using the MX25 ADC.
> +
>  config HI8435
>  	tristate "Holt Integrated Circuits HI-8435 threshold detector"
>  	select IIO_TRIGGERED_EVENT
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index 99b37a963a1e..2fe9b78e4b02 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o
>  obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o
>  obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
>  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
> +obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
>  obj-$(CONFIG_HI8435) += hi8435.o
>  obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
>  obj-$(CONFIG_MAX1027) += max1027.o
> diff --git a/drivers/iio/adc/fsl-imx25-gcq.c b/drivers/iio/adc/fsl-imx25-gcq.c
> new file mode 100644
> index 000000000000..eb9570876291
> --- /dev/null
> +++ b/drivers/iio/adc/fsl-imx25-gcq.c
> @@ -0,0 +1,415 @@
> +/*
> + * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
> + *
> + * This program is free software; you can redistribute it and/or modify it under
> + * the terms of the GNU General Public License version 2 as published by the
> + * Free Software Foundation.
> + *
> + * This is the driver for the imx25 GCQ (Generic Conversion Queue)
> + * connected to the imx25 ADC.
> + */
> +
> +#include <dt-bindings/iio/adc/fsl-imx25-gcq.h>
> +#include <linux/clk.h>
> +#include <linux/iio/iio.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/imx25-tsadc.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +
> +#define MX25_GCQ_TIMEOUT (msecs_to_jiffies(2000))
> +
> +static const char * const driver_name = "mx25-gcq";
> +
> +enum mx25_gcq_cfgs {
> +	MX25_CFG_XP = 0,
> +	MX25_CFG_YP,
> +	MX25_CFG_XN,
> +	MX25_CFG_YN,
> +	MX25_CFG_WIPER,
> +	MX25_CFG_INAUX0,
> +	MX25_CFG_INAUX1,
> +	MX25_CFG_INAUX2,
> +	MX25_NUM_CFGS,
> +};
> +
> +struct mx25_gcq_priv {
> +	struct regmap *regs;
> +	struct completion completed;
> +	struct clk *clk;
> +	int irq;
> +	struct regulator *vref[4];
> +	u32 channel_vref_mv[MX25_NUM_CFGS];
> +};
> +
> +#define MX25_CQG_CHAN(chan, id) {\
> +	.type = IIO_VOLTAGE,\
> +	.indexed = 1,\
> +	.channel = chan,\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> +			      BIT(IIO_CHAN_INFO_SCALE),\
> +	.datasheet_name = id,\
> +}
> +
> +static const struct iio_chan_spec mx25_gcq_channels[MX25_NUM_CFGS] = {
> +	MX25_CQG_CHAN(MX25_CFG_XP, "xp"),
> +	MX25_CQG_CHAN(MX25_CFG_YP, "yp"),
> +	MX25_CQG_CHAN(MX25_CFG_XN, "xn"),
> +	MX25_CQG_CHAN(MX25_CFG_YN, "yn"),
> +	MX25_CQG_CHAN(MX25_CFG_WIPER, "wiper"),
> +	MX25_CQG_CHAN(MX25_CFG_INAUX0, "inaux0"),
> +	MX25_CQG_CHAN(MX25_CFG_INAUX1, "inaux1"),
> +	MX25_CQG_CHAN(MX25_CFG_INAUX2, "inaux2"),
> +};
> +
> +static const char * const mx25_gcq_refp_names[] = {
> +	[MX25_ADC_REFP_YP] = "yp",
> +	[MX25_ADC_REFP_XP] = "xp",
> +	[MX25_ADC_REFP_INT] = "int",
> +	[MX25_ADC_REFP_EXT] = "ext",
> +};
> +
> +static irqreturn_t mx25_gcq_irq(int irq, void *data)
> +{
> +	struct mx25_gcq_priv *priv = data;
> +	u32 stats;
> +
> +	regmap_read(priv->regs, MX25_ADCQ_SR, &stats);
> +
> +	if (stats & MX25_ADCQ_SR_EOQ) {
> +		regmap_update_bits(priv->regs, MX25_ADCQ_MR,
> +				   MX25_ADCQ_MR_EOQ_IRQ, MX25_ADCQ_MR_EOQ_IRQ);
> +		complete(&priv->completed);
> +	}
> +
> +	/* Disable conversion queue run */
> +	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS, 0);
> +
> +	/* Acknowledge all possible irqs */
> +	regmap_write(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |
> +		     MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR |
> +		     MX25_ADCQ_SR_EOQ | MX25_ADCQ_SR_PD);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int mx25_gcq_get_raw_value(struct device *dev,
> +				  struct iio_chan_spec const *chan,
> +				  struct mx25_gcq_priv *priv,
> +				  int *val)
> +{
> +	long timeout;
> +	u32 data;
> +
> +	/* Setup the configuration we want to use */
> +	regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,
> +		     MX25_ADCQ_ITEM(0, chan->channel));
> +
> +	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_EOQ_IRQ, 0);
> +
> +	/* Trigger queue for one run */
> +	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS,
> +			   MX25_ADCQ_CR_FQS);
> +
> +	timeout = wait_for_completion_interruptible_timeout(
> +		&priv->completed, MX25_GCQ_TIMEOUT);
> +	if (timeout < 0) {
> +		dev_err(dev, "ADC wait for measurement failed\n");
> +		return timeout;
> +	} else if (timeout == 0) {
> +		dev_err(dev, "ADC timed out\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	regmap_read(priv->regs, MX25_ADCQ_FIFO, &data);
> +
> +	*val = MX25_ADCQ_FIFO_DATA(data);
> +
> +	return IIO_VAL_INT;
> +}
> +
> +static int mx25_gcq_read_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan, int *val,
> +			     int *val2, long mask)
> +{
> +	struct mx25_gcq_priv *priv = iio_priv(indio_dev);
> +	int ret;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		mutex_lock(&indio_dev->mlock);
> +		ret = mx25_gcq_get_raw_value(&indio_dev->dev, chan, priv, val);
> +		mutex_unlock(&indio_dev->mlock);
> +		return ret;
> +
> +	case IIO_CHAN_INFO_SCALE:
> +		*val = priv->channel_vref_mv[chan->channel];
> +		*val2 = 12;
> +		return IIO_VAL_FRACTIONAL_LOG2;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const struct iio_info mx25_gcq_iio_info = {
> +	.read_raw = mx25_gcq_read_raw,
> +};
> +
> +static const struct regmap_config mx25_gcq_regconfig = {
> +	.max_register = 0x5c,
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +};
> +
> +static int mx25_gcq_setup_cfgs(struct platform_device *pdev,
> +			       struct mx25_gcq_priv *priv)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *child;
> +	struct device *dev = &pdev->dev;
> +	unsigned int refp_used[4] = {};
> +	int ret, i;
> +
> +	/*
> +	 * Setup all configurations registers with a default conversion
> +	 * configuration for each input
> +	 */
> +	for (i = 0; i < MX25_NUM_CFGS; ++i)
> +		regmap_write(priv->regs, MX25_ADCQ_CFG(i),
> +			     MX25_ADCQ_CFG_YPLL_OFF |
> +			     MX25_ADCQ_CFG_XNUR_OFF |
> +			     MX25_ADCQ_CFG_XPUL_OFF |
> +			     MX25_ADCQ_CFG_REFP_INT |
> +			     MX25_ADCQ_CFG_IN(i) |
> +			     MX25_ADCQ_CFG_REFN_NGND2);
> +
> +	/*
> +	 * First get all regulators to store them in channel_vref_mv if
> +	 * necessary. Later we use that information for proper IIO scale
> +	 * information.
> +	 */
> +	priv->vref[MX25_ADC_REFP_INT] = NULL;
> +	priv->vref[MX25_ADC_REFP_EXT] =
> +		devm_regulator_get_optional(&pdev->dev, "vref-ext");
> +	priv->vref[MX25_ADC_REFP_XP] =
> +		devm_regulator_get_optional(&pdev->dev, "vref-xp");
> +	priv->vref[MX25_ADC_REFP_YP] =
> +		devm_regulator_get_optional(&pdev->dev, "vref-yp");
> +
> +	for_each_child_of_node(np, child) {
> +		u32 reg;
> +		u32 refp = MX25_ADCQ_CFG_REFP_INT;
> +		u32 refn = MX25_ADCQ_CFG_REFN_NGND2;
> +
> +		ret = of_property_read_u32(child, "reg", &reg);
> +		if (ret) {
> +			dev_err(dev, "Failed to get reg property\n");
> +			return ret;
> +		}
> +
> +		if (reg >= MX25_NUM_CFGS) {
> +			dev_err(dev,
> +				"reg value is greater than the number of available configuration registers\n");
> +			return -EINVAL;
> +		}
> +
> +		of_property_read_u32(child, "fsl,adc-refp", &refp);
> +		of_property_read_u32(child, "fsl,adc-refn", &refn);
> +
> +		switch (refp) {
> +		case MX25_ADC_REFP_EXT:
> +		case MX25_ADC_REFP_XP:
> +		case MX25_ADC_REFP_YP:
> +			if (IS_ERR(priv->vref[refp])) {
> +				dev_err(dev, "Error, trying to use external voltage reference without a vref-%s regulator.",
> +					mx25_gcq_refp_names[refp]);
> +				return PTR_ERR(priv->vref[refp]);
> +			}
> +			priv->channel_vref_mv[reg] =
> +				regulator_get_voltage(priv->vref[refp]);
> +			/* Conversion from uV to mV */
> +			do_div(priv->channel_vref_mv[reg], 1000);
> +			break;
> +		case MX25_ADC_REFP_INT:
> +			priv->channel_vref_mv[reg] = 2500;
> +			break;
> +		default:
> +			dev_err(dev, "Invalid positive reference %d\n", refp);
> +			return -EINVAL;
> +		}
> +
> +		++refp_used[refp];
> +
> +		/*
> +		 * Shift the read values to the correct positions within the
> +		 * register.
> +		 */
> +		refp = MX25_ADCQ_CFG_REFP(refp);
> +		refn = MX25_ADCQ_CFG_REFN(refn);
> +
> +		if ((refp & MX25_ADCQ_CFG_REFP_MASK) != refp) {
> +			dev_err(dev, "Invalid fsl,adc-refp property value\n");
> +			return -EINVAL;
> +		}
> +		if ((refn & MX25_ADCQ_CFG_REFN_MASK) != refn) {
> +			dev_err(dev, "Invalid fsl,adc-refn property value\n");
> +			return -EINVAL;
> +		}
> +
> +		regmap_update_bits(priv->regs, MX25_ADCQ_CFG(reg),
> +				   MX25_ADCQ_CFG_REFP_MASK |
> +				   MX25_ADCQ_CFG_REFN_MASK,
> +				   refp | refn);
> +	}
> +	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
> +			   MX25_ADCQ_CR_FRST | MX25_ADCQ_CR_QRST,
> +			   MX25_ADCQ_CR_FRST | MX25_ADCQ_CR_QRST);
> +
> +	regmap_write(priv->regs, MX25_ADCQ_CR,
> +		     MX25_ADCQ_CR_PDMSK | MX25_ADCQ_CR_QSM_FQS);
> +
> +	/* Remove unused regulators */
> +	for (i = 0; i != 4; ++i) {
> +		if (!refp_used[i]) {
> +			if (!IS_ERR_OR_NULL(priv->vref[i]))
> +				devm_regulator_put(priv->vref[i]);
> +			priv->vref[i] = NULL;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int mx25_gcq_probe(struct platform_device *pdev)
> +{
> +	struct iio_dev *indio_dev;
> +	struct mx25_gcq_priv *priv;
> +	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	void __iomem *mem;
> +	int ret;
> +	int i;
> +
> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	priv = iio_priv(indio_dev);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	mem = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(mem))
> +		return PTR_ERR(mem);
> +
> +	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);
> +	if (IS_ERR(priv->regs)) {
> +		dev_err(dev, "Failed to initialize regmap\n");
> +		return PTR_ERR(priv->regs);
> +	}
> +
> +	init_completion(&priv->completed);
> +
> +	ret = mx25_gcq_setup_cfgs(pdev, priv);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i != 4; ++i) {
> +		if (!priv->vref[i])
> +			continue;
> +
> +		ret = regulator_enable(priv->vref[i]);
> +		if (ret)
> +			goto err_regulator_disable;
> +	}
> +
> +	priv->clk = tsadc->clk;
> +	ret = clk_prepare_enable(priv->clk);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable clock\n");
> +		goto err_vref_disable;
> +	}
> +
> +	priv->irq = platform_get_irq(pdev, 0);
> +	if (priv->irq <= 0) {
> +		dev_err(dev, "Failed to get IRQ\n");
> +		ret = priv->irq;
If it is zero you'll return 0 from probe (success)
whilst actually failing.  
> +		goto err_clk_unprepare;
> +	}
> +
> +	ret = request_irq(priv->irq, mx25_gcq_irq, 0, pdev->name, priv);
> +	if (ret) {
> +		dev_err(dev, "Failed requesting IRQ\n");
> +		goto err_clk_unprepare;
> +	}
> +
> +	indio_dev->dev.parent = &pdev->dev;
> +	indio_dev->channels = mx25_gcq_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(mx25_gcq_channels);
> +	indio_dev->info = &mx25_gcq_iio_info;
> +	indio_dev->name = driver_name;
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret) {
> +		dev_err(dev, "Failed to register iio device\n");
> +		goto err_irq_free;
> +	}
> +
> +	platform_set_drvdata(pdev, indio_dev);
> +
> +	return 0;
> +
> +err_irq_free:
> +	free_irq(priv->irq, (void *)priv);
Cast to void * not needed. Any pointer can be implicitly be
cast to void *

> +err_clk_unprepare:
> +	clk_disable_unprepare(priv->clk);
> +err_vref_disable:
> +	i = 4;
> +err_regulator_disable:
> +	for (; i-- > 0;) {
> +		if (priv->vref[i])
> +			regulator_disable(priv->vref[i]);
> +	}
> +	return ret;
> +}
> +
> +static int mx25_gcq_remove(struct platform_device *pdev)
> +{
> +	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> +	struct mx25_gcq_priv *priv = iio_priv(indio_dev);
> +	int i;
> +
> +	iio_device_unregister(indio_dev);
> +	free_irq(priv->irq, priv);
> +	clk_disable_unprepare(priv->clk);
> +	for (i = 4; i-- > 0;) {
> +		if (priv->vref[i])
> +			regulator_disable(priv->vref[i]);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id mx25_gcq_ids[] = {
> +	{ .compatible = "fsl,imx25-gcq", },
> +	{ /* Sentinel */ }
> +};
> +
> +static struct platform_driver mx25_gcq_driver = {
> +	.driver		= {
> +		.name	= "mx25-gcq",
> +		.of_match_table = mx25_gcq_ids,
> +	},
> +	.probe		= mx25_gcq_probe,
> +	.remove		= mx25_gcq_remove,
> +};
> +module_platform_driver(mx25_gcq_driver);
> +
> +MODULE_DESCRIPTION("ADC driver for Freescale mx25");
> +MODULE_AUTHOR("Markus Pargmann <mpa@pengutronix.de>");
> +MODULE_LICENSE("GPL v2");
> 

Re: [PATCH v9 5/8] iio: adc: fsl,imx25-gcq driver

[Markus Pargmann]

[-- Attachment #1: Type: text/plain, Size: 17263 bytes --]

Hi,

On Saturday 12 December 2015 17:14:24 Jonathan Cameron wrote:
> On 06/12/15 19:52, Markus Pargmann wrote:
> > This is a conversion queue driver for the mx25 SoC. It uses the central
> > ADC which is used by two seperate independent queues. This driver
> > prepares different conversion configurations for each possible input.
> > For a conversion it creates a conversionqueue of one item with the
> conversion queue
> > correct configuration for the chosen channel. It then executes the queue
> > once and disables the conversion queue afterwards.
> > 
> > The reference voltages are configurable through devicetree subnodes,
> > depending on the connections of the ADC inputs.
> > 
> > Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> > Signed-off-by: Denis Carikli <denis-fO0SIAKYzcbQT0dZR+AlfA@public.gmane.org>
> A couple of little bits inline.  Fix the return of 0 on fail in probe
> and you can add

Thanks, I fixed all your comments for the next version.

Best Regards,

Markus

> 
> Acked-by: Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > ---
> > 
> > Notes:
> >     Changes in v7:
> >      - Remove separate functions mx25_gcq_disable/enable_eoq() as they were used at
> >        only one position
> >      - Enforce an external reference regulator if one of the conversions uses it as
> >        reference. The devm_regulator_get() call was moved into
> >        mx25_gcq_setup_cfgs() to be able to acquire the reference regulator when
> >        necessary.
> >      - Store indio_dev as platform driver data instead of the private data. This
> >        was changed in probe() and remove().
> >     
> >     Changes in v6:
> >      - Added defines for a complete list of references in the dt binding macros
> > 
> >  drivers/iio/adc/Kconfig         |   7 +
> >  drivers/iio/adc/Makefile        |   1 +
> >  drivers/iio/adc/fsl-imx25-gcq.c | 415 ++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 423 insertions(+)
> >  create mode 100644 drivers/iio/adc/fsl-imx25-gcq.c
> > 
> > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> > index 7868c744fd4b..73145c53ec2c 100644
> > --- a/drivers/iio/adc/Kconfig
> > +++ b/drivers/iio/adc/Kconfig
> > @@ -183,6 +183,13 @@ config EXYNOS_ADC
> >  	  To compile this driver as a module, choose M here: the module will be
> >  	  called exynos_adc.
> >  
> > +config FSL_MX25_ADC
> > +	tristate "Freescale MX25 ADC driver"
> > +	depends on MFD_MX25_TSADC
> > +	help
> > +	  Generic Conversion Queue driver used for general purpose ADC in the
> > +	  MX25. This driver supports single measurements using the MX25 ADC.
> > +
> >  config HI8435
> >  	tristate "Holt Integrated Circuits HI-8435 threshold detector"
> >  	select IIO_TRIGGERED_EVENT
> > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> > index 99b37a963a1e..2fe9b78e4b02 100644
> > --- a/drivers/iio/adc/Makefile
> > +++ b/drivers/iio/adc/Makefile
> > @@ -19,6 +19,7 @@ obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o
> >  obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o
> >  obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
> >  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
> > +obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
> >  obj-$(CONFIG_HI8435) += hi8435.o
> >  obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
> >  obj-$(CONFIG_MAX1027) += max1027.o
> > diff --git a/drivers/iio/adc/fsl-imx25-gcq.c b/drivers/iio/adc/fsl-imx25-gcq.c
> > new file mode 100644
> > index 000000000000..eb9570876291
> > --- /dev/null
> > +++ b/drivers/iio/adc/fsl-imx25-gcq.c
> > @@ -0,0 +1,415 @@
> > +/*
> > + * Copyright (C) 2014-2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it under
> > + * the terms of the GNU General Public License version 2 as published by the
> > + * Free Software Foundation.
> > + *
> > + * This is the driver for the imx25 GCQ (Generic Conversion Queue)
> > + * connected to the imx25 ADC.
> > + */
> > +
> > +#include <dt-bindings/iio/adc/fsl-imx25-gcq.h>
> > +#include <linux/clk.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/mfd/imx25-tsadc.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/regulator/consumer.h>
> > +
> > +#define MX25_GCQ_TIMEOUT (msecs_to_jiffies(2000))
> > +
> > +static const char * const driver_name = "mx25-gcq";
> > +
> > +enum mx25_gcq_cfgs {
> > +	MX25_CFG_XP = 0,
> > +	MX25_CFG_YP,
> > +	MX25_CFG_XN,
> > +	MX25_CFG_YN,
> > +	MX25_CFG_WIPER,
> > +	MX25_CFG_INAUX0,
> > +	MX25_CFG_INAUX1,
> > +	MX25_CFG_INAUX2,
> > +	MX25_NUM_CFGS,
> > +};
> > +
> > +struct mx25_gcq_priv {
> > +	struct regmap *regs;
> > +	struct completion completed;
> > +	struct clk *clk;
> > +	int irq;
> > +	struct regulator *vref[4];
> > +	u32 channel_vref_mv[MX25_NUM_CFGS];
> > +};
> > +
> > +#define MX25_CQG_CHAN(chan, id) {\
> > +	.type = IIO_VOLTAGE,\
> > +	.indexed = 1,\
> > +	.channel = chan,\
> > +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> > +			      BIT(IIO_CHAN_INFO_SCALE),\
> > +	.datasheet_name = id,\
> > +}
> > +
> > +static const struct iio_chan_spec mx25_gcq_channels[MX25_NUM_CFGS] = {
> > +	MX25_CQG_CHAN(MX25_CFG_XP, "xp"),
> > +	MX25_CQG_CHAN(MX25_CFG_YP, "yp"),
> > +	MX25_CQG_CHAN(MX25_CFG_XN, "xn"),
> > +	MX25_CQG_CHAN(MX25_CFG_YN, "yn"),
> > +	MX25_CQG_CHAN(MX25_CFG_WIPER, "wiper"),
> > +	MX25_CQG_CHAN(MX25_CFG_INAUX0, "inaux0"),
> > +	MX25_CQG_CHAN(MX25_CFG_INAUX1, "inaux1"),
> > +	MX25_CQG_CHAN(MX25_CFG_INAUX2, "inaux2"),
> > +};
> > +
> > +static const char * const mx25_gcq_refp_names[] = {
> > +	[MX25_ADC_REFP_YP] = "yp",
> > +	[MX25_ADC_REFP_XP] = "xp",
> > +	[MX25_ADC_REFP_INT] = "int",
> > +	[MX25_ADC_REFP_EXT] = "ext",
> > +};
> > +
> > +static irqreturn_t mx25_gcq_irq(int irq, void *data)
> > +{
> > +	struct mx25_gcq_priv *priv = data;
> > +	u32 stats;
> > +
> > +	regmap_read(priv->regs, MX25_ADCQ_SR, &stats);
> > +
> > +	if (stats & MX25_ADCQ_SR_EOQ) {
> > +		regmap_update_bits(priv->regs, MX25_ADCQ_MR,
> > +				   MX25_ADCQ_MR_EOQ_IRQ, MX25_ADCQ_MR_EOQ_IRQ);
> > +		complete(&priv->completed);
> > +	}
> > +
> > +	/* Disable conversion queue run */
> > +	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS, 0);
> > +
> > +	/* Acknowledge all possible irqs */
> > +	regmap_write(priv->regs, MX25_ADCQ_SR, MX25_ADCQ_SR_FRR |
> > +		     MX25_ADCQ_SR_FUR | MX25_ADCQ_SR_FOR |
> > +		     MX25_ADCQ_SR_EOQ | MX25_ADCQ_SR_PD);
> > +
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +static int mx25_gcq_get_raw_value(struct device *dev,
> > +				  struct iio_chan_spec const *chan,
> > +				  struct mx25_gcq_priv *priv,
> > +				  int *val)
> > +{
> > +	long timeout;
> > +	u32 data;
> > +
> > +	/* Setup the configuration we want to use */
> > +	regmap_write(priv->regs, MX25_ADCQ_ITEM_7_0,
> > +		     MX25_ADCQ_ITEM(0, chan->channel));
> > +
> > +	regmap_update_bits(priv->regs, MX25_ADCQ_MR, MX25_ADCQ_MR_EOQ_IRQ, 0);
> > +
> > +	/* Trigger queue for one run */
> > +	regmap_update_bits(priv->regs, MX25_ADCQ_CR, MX25_ADCQ_CR_FQS,
> > +			   MX25_ADCQ_CR_FQS);
> > +
> > +	timeout = wait_for_completion_interruptible_timeout(
> > +		&priv->completed, MX25_GCQ_TIMEOUT);
> > +	if (timeout < 0) {
> > +		dev_err(dev, "ADC wait for measurement failed\n");
> > +		return timeout;
> > +	} else if (timeout == 0) {
> > +		dev_err(dev, "ADC timed out\n");
> > +		return -ETIMEDOUT;
> > +	}
> > +
> > +	regmap_read(priv->regs, MX25_ADCQ_FIFO, &data);
> > +
> > +	*val = MX25_ADCQ_FIFO_DATA(data);
> > +
> > +	return IIO_VAL_INT;
> > +}
> > +
> > +static int mx25_gcq_read_raw(struct iio_dev *indio_dev,
> > +			     struct iio_chan_spec const *chan, int *val,
> > +			     int *val2, long mask)
> > +{
> > +	struct mx25_gcq_priv *priv = iio_priv(indio_dev);
> > +	int ret;
> > +
> > +	switch (mask) {
> > +	case IIO_CHAN_INFO_RAW:
> > +		mutex_lock(&indio_dev->mlock);
> > +		ret = mx25_gcq_get_raw_value(&indio_dev->dev, chan, priv, val);
> > +		mutex_unlock(&indio_dev->mlock);
> > +		return ret;
> > +
> > +	case IIO_CHAN_INFO_SCALE:
> > +		*val = priv->channel_vref_mv[chan->channel];
> > +		*val2 = 12;
> > +		return IIO_VAL_FRACTIONAL_LOG2;
> > +
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +}
> > +
> > +static const struct iio_info mx25_gcq_iio_info = {
> > +	.read_raw = mx25_gcq_read_raw,
> > +};
> > +
> > +static const struct regmap_config mx25_gcq_regconfig = {
> > +	.max_register = 0x5c,
> > +	.reg_bits = 32,
> > +	.val_bits = 32,
> > +	.reg_stride = 4,
> > +};
> > +
> > +static int mx25_gcq_setup_cfgs(struct platform_device *pdev,
> > +			       struct mx25_gcq_priv *priv)
> > +{
> > +	struct device_node *np = pdev->dev.of_node;
> > +	struct device_node *child;
> > +	struct device *dev = &pdev->dev;
> > +	unsigned int refp_used[4] = {};
> > +	int ret, i;
> > +
> > +	/*
> > +	 * Setup all configurations registers with a default conversion
> > +	 * configuration for each input
> > +	 */
> > +	for (i = 0; i < MX25_NUM_CFGS; ++i)
> > +		regmap_write(priv->regs, MX25_ADCQ_CFG(i),
> > +			     MX25_ADCQ_CFG_YPLL_OFF |
> > +			     MX25_ADCQ_CFG_XNUR_OFF |
> > +			     MX25_ADCQ_CFG_XPUL_OFF |
> > +			     MX25_ADCQ_CFG_REFP_INT |
> > +			     MX25_ADCQ_CFG_IN(i) |
> > +			     MX25_ADCQ_CFG_REFN_NGND2);
> > +
> > +	/*
> > +	 * First get all regulators to store them in channel_vref_mv if
> > +	 * necessary. Later we use that information for proper IIO scale
> > +	 * information.
> > +	 */
> > +	priv->vref[MX25_ADC_REFP_INT] = NULL;
> > +	priv->vref[MX25_ADC_REFP_EXT] =
> > +		devm_regulator_get_optional(&pdev->dev, "vref-ext");
> > +	priv->vref[MX25_ADC_REFP_XP] =
> > +		devm_regulator_get_optional(&pdev->dev, "vref-xp");
> > +	priv->vref[MX25_ADC_REFP_YP] =
> > +		devm_regulator_get_optional(&pdev->dev, "vref-yp");
> > +
> > +	for_each_child_of_node(np, child) {
> > +		u32 reg;
> > +		u32 refp = MX25_ADCQ_CFG_REFP_INT;
> > +		u32 refn = MX25_ADCQ_CFG_REFN_NGND2;
> > +
> > +		ret = of_property_read_u32(child, "reg", &reg);
> > +		if (ret) {
> > +			dev_err(dev, "Failed to get reg property\n");
> > +			return ret;
> > +		}
> > +
> > +		if (reg >= MX25_NUM_CFGS) {
> > +			dev_err(dev,
> > +				"reg value is greater than the number of available configuration registers\n");
> > +			return -EINVAL;
> > +		}
> > +
> > +		of_property_read_u32(child, "fsl,adc-refp", &refp);
> > +		of_property_read_u32(child, "fsl,adc-refn", &refn);
> > +
> > +		switch (refp) {
> > +		case MX25_ADC_REFP_EXT:
> > +		case MX25_ADC_REFP_XP:
> > +		case MX25_ADC_REFP_YP:
> > +			if (IS_ERR(priv->vref[refp])) {
> > +				dev_err(dev, "Error, trying to use external voltage reference without a vref-%s regulator.",
> > +					mx25_gcq_refp_names[refp]);
> > +				return PTR_ERR(priv->vref[refp]);
> > +			}
> > +			priv->channel_vref_mv[reg] =
> > +				regulator_get_voltage(priv->vref[refp]);
> > +			/* Conversion from uV to mV */
> > +			do_div(priv->channel_vref_mv[reg], 1000);
> > +			break;
> > +		case MX25_ADC_REFP_INT:
> > +			priv->channel_vref_mv[reg] = 2500;
> > +			break;
> > +		default:
> > +			dev_err(dev, "Invalid positive reference %d\n", refp);
> > +			return -EINVAL;
> > +		}
> > +
> > +		++refp_used[refp];
> > +
> > +		/*
> > +		 * Shift the read values to the correct positions within the
> > +		 * register.
> > +		 */
> > +		refp = MX25_ADCQ_CFG_REFP(refp);
> > +		refn = MX25_ADCQ_CFG_REFN(refn);
> > +
> > +		if ((refp & MX25_ADCQ_CFG_REFP_MASK) != refp) {
> > +			dev_err(dev, "Invalid fsl,adc-refp property value\n");
> > +			return -EINVAL;
> > +		}
> > +		if ((refn & MX25_ADCQ_CFG_REFN_MASK) != refn) {
> > +			dev_err(dev, "Invalid fsl,adc-refn property value\n");
> > +			return -EINVAL;
> > +		}
> > +
> > +		regmap_update_bits(priv->regs, MX25_ADCQ_CFG(reg),
> > +				   MX25_ADCQ_CFG_REFP_MASK |
> > +				   MX25_ADCQ_CFG_REFN_MASK,
> > +				   refp | refn);
> > +	}
> > +	regmap_update_bits(priv->regs, MX25_ADCQ_CR,
> > +			   MX25_ADCQ_CR_FRST | MX25_ADCQ_CR_QRST,
> > +			   MX25_ADCQ_CR_FRST | MX25_ADCQ_CR_QRST);
> > +
> > +	regmap_write(priv->regs, MX25_ADCQ_CR,
> > +		     MX25_ADCQ_CR_PDMSK | MX25_ADCQ_CR_QSM_FQS);
> > +
> > +	/* Remove unused regulators */
> > +	for (i = 0; i != 4; ++i) {
> > +		if (!refp_used[i]) {
> > +			if (!IS_ERR_OR_NULL(priv->vref[i]))
> > +				devm_regulator_put(priv->vref[i]);
> > +			priv->vref[i] = NULL;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int mx25_gcq_probe(struct platform_device *pdev)
> > +{
> > +	struct iio_dev *indio_dev;
> > +	struct mx25_gcq_priv *priv;
> > +	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);
> > +	struct device *dev = &pdev->dev;
> > +	struct resource *res;
> > +	void __iomem *mem;
> > +	int ret;
> > +	int i;
> > +
> > +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
> > +	if (!indio_dev)
> > +		return -ENOMEM;
> > +
> > +	priv = iio_priv(indio_dev);
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	mem = devm_ioremap_resource(dev, res);
> > +	if (IS_ERR(mem))
> > +		return PTR_ERR(mem);
> > +
> > +	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);
> > +	if (IS_ERR(priv->regs)) {
> > +		dev_err(dev, "Failed to initialize regmap\n");
> > +		return PTR_ERR(priv->regs);
> > +	}
> > +
> > +	init_completion(&priv->completed);
> > +
> > +	ret = mx25_gcq_setup_cfgs(pdev, priv);
> > +	if (ret)
> > +		return ret;
> > +
> > +	for (i = 0; i != 4; ++i) {
> > +		if (!priv->vref[i])
> > +			continue;
> > +
> > +		ret = regulator_enable(priv->vref[i]);
> > +		if (ret)
> > +			goto err_regulator_disable;
> > +	}
> > +
> > +	priv->clk = tsadc->clk;
> > +	ret = clk_prepare_enable(priv->clk);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to enable clock\n");
> > +		goto err_vref_disable;
> > +	}
> > +
> > +	priv->irq = platform_get_irq(pdev, 0);
> > +	if (priv->irq <= 0) {
> > +		dev_err(dev, "Failed to get IRQ\n");
> > +		ret = priv->irq;
> If it is zero you'll return 0 from probe (success)
> whilst actually failing.  
> > +		goto err_clk_unprepare;
> > +	}
> > +
> > +	ret = request_irq(priv->irq, mx25_gcq_irq, 0, pdev->name, priv);
> > +	if (ret) {
> > +		dev_err(dev, "Failed requesting IRQ\n");
> > +		goto err_clk_unprepare;
> > +	}
> > +
> > +	indio_dev->dev.parent = &pdev->dev;
> > +	indio_dev->channels = mx25_gcq_channels;
> > +	indio_dev->num_channels = ARRAY_SIZE(mx25_gcq_channels);
> > +	indio_dev->info = &mx25_gcq_iio_info;
> > +	indio_dev->name = driver_name;
> > +
> > +	ret = iio_device_register(indio_dev);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to register iio device\n");
> > +		goto err_irq_free;
> > +	}
> > +
> > +	platform_set_drvdata(pdev, indio_dev);
> > +
> > +	return 0;
> > +
> > +err_irq_free:
> > +	free_irq(priv->irq, (void *)priv);
> Cast to void * not needed. Any pointer can be implicitly be
> cast to void *
> 
> > +err_clk_unprepare:
> > +	clk_disable_unprepare(priv->clk);
> > +err_vref_disable:
> > +	i = 4;
> > +err_regulator_disable:
> > +	for (; i-- > 0;) {
> > +		if (priv->vref[i])
> > +			regulator_disable(priv->vref[i]);
> > +	}
> > +	return ret;
> > +}
> > +
> > +static int mx25_gcq_remove(struct platform_device *pdev)
> > +{
> > +	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> > +	struct mx25_gcq_priv *priv = iio_priv(indio_dev);
> > +	int i;
> > +
> > +	iio_device_unregister(indio_dev);
> > +	free_irq(priv->irq, priv);
> > +	clk_disable_unprepare(priv->clk);
> > +	for (i = 4; i-- > 0;) {
> > +		if (priv->vref[i])
> > +			regulator_disable(priv->vref[i]);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id mx25_gcq_ids[] = {
> > +	{ .compatible = "fsl,imx25-gcq", },
> > +	{ /* Sentinel */ }
> > +};
> > +
> > +static struct platform_driver mx25_gcq_driver = {
> > +	.driver		= {
> > +		.name	= "mx25-gcq",
> > +		.of_match_table = mx25_gcq_ids,
> > +	},
> > +	.probe		= mx25_gcq_probe,
> > +	.remove		= mx25_gcq_remove,
> > +};
> > +module_platform_driver(mx25_gcq_driver);
> > +
> > +MODULE_DESCRIPTION("ADC driver for Freescale mx25");
> > +MODULE_AUTHOR("Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>");
> > +MODULE_LICENSE("GPL v2");
> > 
> 
> 
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> 

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[PATCH v9 7/8] ARM: dts: imx25: Add TSC and ADC support

[Markus Pargmann]

From: Denis Carikli <denis@eukrea.com>

Signed-off-by: Denis Carikli <denis@eukrea.com>
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
 arch/arm/boot/dts/imx25.dtsi | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/imx25.dtsi b/arch/arm/boot/dts/imx25.dtsi
index 677f81d9dcd5..6ac5e71d312b 100644
--- a/arch/arm/boot/dts/imx25.dtsi
+++ b/arch/arm/boot/dts/imx25.dtsi
@@ -265,13 +265,36 @@
 				status = "disabled";
 			};
 
-			tsc: tsc@50030000 {
-				compatible = "fsl,imx25-adc", "fsl,imx21-tsc";
-				reg = <0x50030000 0x4000>;
+			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>;
 				status = "disabled";
+
+				adc: adc@50030800 {
+					compatible = "fsl,imx25-gcq";
+					reg = <0x50030800 0x60>;
+					interrupt-parent = <&tscadc>;
+					interrupts = <1>;
+					#address-cells = <1>;
+					#size-cells = <0>;
+					status = "disabled";
+				};
+
+				tsc: tcq@50030400 {
+					compatible = "fsl,imx25-tcq";
+					reg = <0x50030400 0x60>;
+					interrupt-parent = <&tscadc>;
+					interrupts = <0>;
+					fsl,wires = <4>;
+					status = "disabled";
+				};
 			};
 
 			ssi1: ssi@50034000 {
-- 
2.6.2

[PATCH v9 8/8] ARM: imx_v4_v5_defconfig: Add I.MX25 Touchscreen controller and ADC support.

[Markus Pargmann]

From: Denis Carikli <denis@eukrea.com>

Signed-off-by: Denis Carikli <denis@eukrea.com>
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
 arch/arm/configs/imx_v4_v5_defconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/configs/imx_v4_v5_defconfig b/arch/arm/configs/imx_v4_v5_defconfig
index d3a8018639de..d6754ac47788 100644
--- a/arch/arm/configs/imx_v4_v5_defconfig
+++ b/arch/arm/configs/imx_v4_v5_defconfig
@@ -88,6 +88,7 @@ CONFIG_KEYBOARD_IMX=y
 # CONFIG_INPUT_MOUSE is not set
 CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_ADS7846=m
+CONFIG_TOUCHSCREEN_MX25=y
 CONFIG_TOUCHSCREEN_MC13783=y
 # CONFIG_LEGACY_PTYS is not set
 CONFIG_SERIAL_8250=m
@@ -107,6 +108,7 @@ CONFIG_HWMON=m
 CONFIG_SENSORS_MC13783_ADC=m
 CONFIG_WATCHDOG=y
 CONFIG_IMX2_WDT=y
+CONFIG_MFD_MX25_TSADC=y
 CONFIG_MFD_MC13XXX_SPI=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
@@ -172,6 +174,8 @@ CONFIG_DMADEVICES=y
 CONFIG_IMX_SDMA=y
 CONFIG_IMX_DMA=y
 # CONFIG_IOMMU_SUPPORT is not set
+CONFIG_IIO=y
+CONFIG_FSL_MX25_ADC=y
 CONFIG_EXT2_FS=y
 CONFIG_EXT3_FS=y
 CONFIG_EXT4_FS=y
-- 
2.6.2