[PATCH v4 1/8] dt-bindings: stmpe: reformatting parameter list and use tabs only

[PATCH v4 1/8] dt-bindings: stmpe: reformatting parameter list and use tabs only

[Philippe Schenker]

This patch reformats the parameter list for stmpe device in a
table-style so it is more clear to read.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

Changes in v4:
 - New separate precursor patch for holding reformatting

Changes in v3: None
Changes in v2: None

 .../bindings/input/touchscreen/stmpe.txt      | 52 ++++++++++++-------
 .../devicetree/bindings/mfd/stmpe.txt         | 14 ++---
 2 files changed, 41 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
index 127baa31a77a..1d3f84308142 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
@@ -5,24 +5,40 @@ Required properties:
  - compatible: "st,stmpe-ts"
 
 Optional properties:
-- st,sample-time: ADC converstion time in number of clock.  (0 -> 36 clocks, 1 ->
-  44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, 4 -> 80 clocks, 5 -> 96 clocks, 6
-  -> 144 clocks), recommended is 4.
-- st,mod-12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
-- st,ref-sel: ADC reference source (0 -> internal reference, 1 -> external
-  reference)
-- st,adc-freq: ADC Clock speed (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
-- st,ave-ctrl: Sample average control (0 -> 1 sample, 1 -> 2 samples, 2 -> 4
-  samples, 3 -> 8 samples)
-- st,touch-det-delay: Touch detect interrupt delay (0 -> 10 us, 1 -> 50 us, 2 ->
-  100 us, 3 -> 500 us, 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) recommended
-  is 3
-- st,settling: Panel driver settling time (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3
-  -> 1 ms, 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) recommended is 2
-- st,fraction-z: Length of the fractional part in z (fraction-z ([0..7]) = Count of
-  the fractional part) recommended is 7
-- st,i-drive: current limit value of the touchscreen drivers (0 -> 20 mA typical 35
-  mA max, 1 -> 50 mA typical 80 mA max)
+- st,sample-time	: ADC conversion time in number of clock.
+				0 -> 36 clocks		4 -> 80 clocks (recommended)
+				1 -> 44 clocks		5 -> 96 clocks
+				2 -> 56 clocks		6 -> 144 clocks
+				3 -> 64 clocks
+- st,mod-12b		: ADC Bit mode
+				0 -> 10bit ADC		1 -> 12bit ADC
+- st,ref-sel		: ADC reference source
+				0 -> internal		1 -> external
+- st,adc-freq		: ADC Clock speed
+				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
+				1 -> 3.25 MHz
+- st,ave-ctrl		: Sample average control
+				0 -> 1 sample
+				1 -> 2 samples
+				2 -> 4 samples
+				3 -> 8 samples
+- st,touch-det-delay	: Touch detect interrupt delay (recommended is 3)
+				0 -> 10 us		5 -> 5 ms
+				1 -> 50 us		6 -> 10 ms
+				2 -> 100 us		7 -> 50 ms
+				3 -> 500 us
+				4 -> 1 ms
+- st,settling		: Panel driver settling time (recommended is 2)
+				0 -> 10 us		5 -> 10 ms
+				1 -> 100 us		6 for 50 ms
+				2 -> 500 us		7 -> 100 ms
+				3 -> 1 ms
+				4 -> 5 ms
+- st,fraction-z		: Length of the fractional part in z (recommended is 7)
+			  (fraction-z ([0..7]) = Count of the fractional part)
+- st,i-drive		: current limit value of the touchscreen drivers
+				0 -> 20 mA (typical 35mA max)
+				1 -> 50 mA (typical 80 mA max)
 
 Node name must be stmpe_touchscreen and should be child node of stmpe node to
 which it belongs.
diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
index c797c05cd3c2..a46e7177195d 100644
--- a/Documentation/devicetree/bindings/mfd/stmpe.txt
+++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
@@ -4,15 +4,15 @@ STMPE is an MFD device which may expose the following inbuilt devices: gpio,
 keypad, touchscreen, adc, pwm, rotator.
 
 Required properties:
- - compatible                   : "st,stmpe[610|801|811|1600|1601|2401|2403]"
- - reg                          : I2C/SPI address of the device
+ - compatible			: "st,stmpe[610|801|811|1600|1601|2401|2403]"
+ - reg				: I2C/SPI address of the device
 
 Optional properties:
- - interrupts                   : The interrupt outputs from the controller
- - interrupt-controller         : Marks the device node as an interrupt controller
- - wakeup-source                : Marks the input device as wakable
- - st,autosleep-timeout         : Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
- - irq-gpio                     : If present, which GPIO to use for event IRQ
+ - interrupts			: The interrupt outputs from the controller
+ - interrupt-controller		: Marks the device node as an interrupt controller
+ - wakeup-source		: Marks the input device as wakable
+ - st,autosleep-timeout		: Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
+ - irq-gpio			: If present, which GPIO to use for event IRQ
 
 Example:
 
-- 
2.19.2

[PATCH v4 2/8] mfd: stmpe: Move ADC related defines to header of mfd

[Philippe Schenker]

Move defines that are ADC related to the header of the overlying mfd,
so they can be used from multiple sub-devices.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

Changes in v4: None
Changes in v3: None
Changes in v2:
 - This is a new added commit. Separate commit for moving the defines
   out of drivers/input/touchscreen/stmpe-ts.c to overlying mfd-device
   drivers/mfd/stmpe.c
 - Pre-fix defines with STMPE_

 drivers/input/touchscreen/stmpe-ts.c | 34 +++++++++++-----------------
 include/linux/mfd/stmpe.h            | 11 +++++++++
 2 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
index 2a78e27b4495..c5d9006588a2 100644
--- a/drivers/input/touchscreen/stmpe-ts.c
+++ b/drivers/input/touchscreen/stmpe-ts.c
@@ -49,17 +49,6 @@
 
 #define STMPE_IRQ_TOUCH_DET		0
 
-#define SAMPLE_TIME(x)			((x & 0xf) << 4)
-#define MOD_12B(x)			((x & 0x1) << 3)
-#define REF_SEL(x)			((x & 0x1) << 1)
-#define ADC_FREQ(x)			(x & 0x3)
-#define AVE_CTRL(x)			((x & 0x3) << 6)
-#define DET_DELAY(x)			((x & 0x7) << 3)
-#define SETTLING(x)			(x & 0x7)
-#define FRACTION_Z(x)			(x & 0x7)
-#define I_DRIVE(x)			(x & 0x1)
-#define OP_MODE(x)			((x & 0x7) << 1)
-
 #define STMPE_TS_NAME			"stmpe-ts"
 #define XY_MASK				0xfff
 
@@ -213,9 +202,10 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
 		return ret;
 	}
 
-	adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
-		REF_SEL(ts->ref_sel);
-	adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
+	adc_ctrl1 = STMPE_SAMPLE_TIME(ts->sample_time) |
+		    STMPE_MOD_12B(ts->mod_12b) | STMPE_REF_SEL(ts->ref_sel);
+	adc_ctrl1_mask = STMPE_SAMPLE_TIME(0xff) | STMPE_MOD_12B(0xff) |
+			 STMPE_REF_SEL(0xff);
 
 	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
 			adc_ctrl1_mask, adc_ctrl1);
@@ -225,15 +215,17 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
 	}
 
 	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
-			ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
+			STMPE_ADC_FREQ(0xff), STMPE_ADC_FREQ(ts->adc_freq));
 	if (ret) {
 		dev_err(dev, "Could not setup ADC\n");
 		return ret;
 	}
 
-	tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
-			SETTLING(ts->settling);
-	tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
+	tsc_cfg = STMPE_AVE_CTRL(ts->ave_ctrl) |
+		  STMPE_DET_DELAY(ts->touch_det_delay) |
+		  STMPE_SETTLING(ts->settling);
+	tsc_cfg_mask = STMPE_AVE_CTRL(0xff) | STMPE_DET_DELAY(0xff) |
+		       STMPE_SETTLING(0xff);
 
 	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
 	if (ret) {
@@ -242,14 +234,14 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
 	}
 
 	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
-			FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
+			STMPE_FRACTION_Z(0xff), STMPE_FRACTION_Z(ts->fraction_z));
 	if (ret) {
 		dev_err(dev, "Could not config touch\n");
 		return ret;
 	}
 
 	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
-			I_DRIVE(0xff), I_DRIVE(ts->i_drive));
+			STMPE_I_DRIVE(0xff), STMPE_I_DRIVE(ts->i_drive));
 	if (ret) {
 		dev_err(dev, "Could not config touch\n");
 		return ret;
@@ -263,7 +255,7 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
 	}
 
 	ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
-			OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
+			STMPE_OP_MODE(0xff), STMPE_OP_MODE(OP_MOD_XYZ));
 	if (ret) {
 		dev_err(dev, "Could not set mode\n");
 		return ret;
diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index 4a827af17e59..c0353f6431f9 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -10,6 +10,17 @@
 
 #include <linux/mutex.h>
 
+#define STMPE_SAMPLE_TIME(x)	((x & 0xf) << 4)
+#define STMPE_MOD_12B(x)	((x & 0x1) << 3)
+#define STMPE_REF_SEL(x)	((x & 0x1) << 1)
+#define STMPE_ADC_FREQ(x)	(x & 0x3)
+#define STMPE_AVE_CTRL(x)	((x & 0x3) << 6)
+#define STMPE_DET_DELAY(x)	((x & 0x7) << 3)
+#define STMPE_SETTLING(x)	(x & 0x7)
+#define STMPE_FRACTION_Z(x)	(x & 0x7)
+#define STMPE_I_DRIVE(x)	(x & 0x1)
+#define STMPE_OP_MODE(x)	((x & 0x7) << 1)
+
 struct device;
 struct regulator;
 
-- 
2.19.2

[PATCH v4 3/8] mfd: stmpe: preparations for STMPE ADC driver

[Philippe Schenker]

This prepares the MFD for the STMPE ADC driver. This commit introduces
devicetree settings that are used by the ADC and adds an init function.
Common ADC settings that are shared with the touchscreen driver can now
reside in the overlying MFD.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

I moved now all enables back to the subdevices. The disable of ADC
block is now done at remove of mfd. I know this is not particularly
right, the right way to do this would be with a refcounter.

But I don't know how to implement this in this driver. If someone does
not agree to disable adc in remove of mfd, please give me some advice
in how to do it with refcounter.

Changes in v4:
 - New patch: split mfd changes into this precursor patch
 - Export the added stmpe811_adc_commmon_init function
 - Disabling adc when mfd is removed

Changes in v3: None
Changes in v2:
 - Move code to setup ADC to MFD device, as it is used by both drivers
   adc and touchscreen

 drivers/mfd/Kconfig       |  3 +-
 drivers/mfd/stmpe.c       | 68 +++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/stmpe.h | 10 ++++++
 3 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 8c5dfdce4326..bba159e8eaa4 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1204,7 +1204,7 @@ config MFD_STMPE
 
 	  Currently supported devices are:
 
-		STMPE811: GPIO, Touchscreen
+		STMPE811: GPIO, Touchscreen, ADC
 		STMPE1601: GPIO, Keypad
 		STMPE1801: GPIO, Keypad
 		STMPE2401: GPIO, Keypad
@@ -1217,6 +1217,7 @@ config MFD_STMPE
 		GPIO: stmpe-gpio
 		Keypad: stmpe-keypad
 		Touchscreen: stmpe-ts
+		ADC: stmpe-adc
 
 menu "STMicroelectronics STMPE Interface Drivers"
 depends on MFD_STMPE
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 566caca4efd8..f582531a8f3e 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -463,6 +463,28 @@ static const struct mfd_cell stmpe_ts_cell = {
 	.num_resources	= ARRAY_SIZE(stmpe_ts_resources),
 };
 
+/*
+ * ADC (STMPE811)
+ */
+
+static struct resource stmpe_adc_resources[] = {
+	{
+		.name	= "STMPE_TEMP_SENS",
+		.flags	= IORESOURCE_IRQ,
+	},
+	{
+		.name	= "STMPE_ADC",
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static const struct mfd_cell stmpe_adc_cell = {
+	.name		= "stmpe-adc",
+	.of_compatible	= "st,stmpe-adc",
+	.resources	= stmpe_adc_resources,
+	.num_resources	= ARRAY_SIZE(stmpe_adc_resources),
+};
+
 /*
  * STMPE811 or STMPE610
  */
@@ -497,6 +519,11 @@ static struct stmpe_variant_block stmpe811_blocks[] = {
 		.irq	= STMPE811_IRQ_TOUCH_DET,
 		.block	= STMPE_BLOCK_TOUCHSCREEN,
 	},
+	{
+		.cell	= &stmpe_adc_cell,
+		.irq	= STMPE811_IRQ_TEMP_SENS,
+		.block	= STMPE_BLOCK_ADC,
+	},
 };
 
 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
@@ -517,6 +544,35 @@ static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
 				enable ? 0 : mask);
 }
 
+int stmpe811_adc_common_init(struct stmpe *stmpe)
+{
+	int ret;
+	u8 adc_ctrl1, adc_ctrl1_mask;
+
+	adc_ctrl1 = STMPE_SAMPLE_TIME(stmpe->sample_time) |
+		    STMPE_MOD_12B(stmpe->mod_12b) |
+		    STMPE_REF_SEL(stmpe->ref_sel);
+	adc_ctrl1_mask = STMPE_SAMPLE_TIME(0xff) | STMPE_MOD_12B(0xff) |
+			 STMPE_REF_SEL(0xff);
+
+	ret = stmpe_set_bits(stmpe, STMPE811_REG_ADC_CTRL1,
+			adc_ctrl1_mask, adc_ctrl1);
+	if (ret) {
+		dev_err(stmpe->dev, "Could not setup ADC\n");
+		return ret;
+	}
+
+	ret = stmpe_set_bits(stmpe, STMPE811_REG_ADC_CTRL2,
+			STMPE_ADC_FREQ(0xff), STMPE_ADC_FREQ(stmpe->adc_freq));
+	if (ret) {
+		dev_err(stmpe->dev, "Could not setup ADC\n");
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(stmpe811_adc_common_init);
+
 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 {
 	/* 0 for touchscreen, 1 for GPIO */
@@ -1325,6 +1381,7 @@ int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
 	struct device_node *np = ci->dev->of_node;
 	struct stmpe *stmpe;
 	int ret;
+	u32 val;
 
 	pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -1342,6 +1399,15 @@ int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
 	mutex_init(&stmpe->irq_lock);
 	mutex_init(&stmpe->lock);
 
+	if (!of_property_read_u32(np, "st,sample-time", &val))
+		stmpe->sample_time = val;
+	if (!of_property_read_u32(np, "st,mod-12b", &val))
+		stmpe->mod_12b = val;
+	if (!of_property_read_u32(np, "st,ref-sel", &val))
+		stmpe->ref_sel = val;
+	if (!of_property_read_u32(np, "st,adc-freq", &val))
+		stmpe->adc_freq = val;
+
 	stmpe->dev = ci->dev;
 	stmpe->client = ci->client;
 	stmpe->pdata = pdata;
@@ -1433,6 +1499,8 @@ int stmpe_remove(struct stmpe *stmpe)
 	if (!IS_ERR(stmpe->vcc))
 		regulator_disable(stmpe->vcc);
 
+	__stmpe_disable(stmpe, STMPE_BLOCK_ADC);
+
 	mfd_remove_devices(stmpe->dev);
 
 	return 0;
diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index c0353f6431f9..07f55aac9390 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -21,6 +21,9 @@
 #define STMPE_I_DRIVE(x)	(x & 0x1)
 #define STMPE_OP_MODE(x)	((x & 0x7) << 1)
 
+#define STMPE811_REG_ADC_CTRL1	0x20
+#define STMPE811_REG_ADC_CTRL2	0x21
+
 struct device;
 struct regulator;
 
@@ -134,6 +137,12 @@ struct stmpe {
 	u8 ier[2];
 	u8 oldier[2];
 	struct stmpe_platform_data *pdata;
+
+	/* For devices that use an ADC */
+	u8 sample_time;
+	u8 mod_12b;
+	u8 ref_sel;
+	u8 adc_freq;
 };
 
 extern int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 data);
@@ -147,6 +156,7 @@ extern int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins,
 			     enum stmpe_block block);
 extern int stmpe_enable(struct stmpe *stmpe, unsigned int blocks);
 extern int stmpe_disable(struct stmpe *stmpe, unsigned int blocks);
+extern int stmpe811_adc_common_init(struct stmpe *stmpe);
 
 #define STMPE_GPIO_NOREQ_811_TOUCH	(0xf0)
 
-- 
2.19.2

Re: [PATCH v4 3/8] mfd: stmpe: preparations for STMPE ADC driver

[Lee Jones]

On Wed, 12 Dec 2018, Philippe Schenker wrote:

> This prepares the MFD for the STMPE ADC driver. This commit introduces
> devicetree settings that are used by the ADC and adds an init function.
> Common ADC settings that are shared with the touchscreen driver can now
> reside in the overlying MFD.
> 
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
> ---
> 
> I moved now all enables back to the subdevices. The disable of ADC
> block is now done at remove of mfd. I know this is not particularly
> right, the right way to do this would be with a refcounter.
> 
> But I don't know how to implement this in this driver. If someone does
> not agree to disable adc in remove of mfd, please give me some advice
> in how to do it with refcounter.
> 
> Changes in v4:
>  - New patch: split mfd changes into this precursor patch
>  - Export the added stmpe811_adc_commmon_init function
>  - Disabling adc when mfd is removed
> 
> Changes in v3: None
> Changes in v2:
>  - Move code to setup ADC to MFD device, as it is used by both drivers
>    adc and touchscreen
> 
>  drivers/mfd/Kconfig       |  3 +-
>  drivers/mfd/stmpe.c       | 68 +++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/stmpe.h | 10 ++++++
>  3 files changed, 80 insertions(+), 1 deletion(-)

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH v4 4/8] Input: stmpe-ts: preparations for STMPE ADC driver

[Philippe Schenker]

This patch removes common ADC settings in favor to use
stmpe811_adc_common_init that is present in MFD. This is necessary in
preparation for the stmpe-adc driver, because those two drivers have
common settings for the ADC.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

Changes in v4:
 - New patch: Split changes in stmpe-ts.c to a separate commit
 - Remove common adc settings from init and call the
   stmpe811_adc_common_init function

Changes in v3:
 - Undo ADC-settings related code-deletions in stmpe-ts.c that the code
   is backwards-compatible to older devicetrees.

Changes in v2: None

 drivers/input/touchscreen/stmpe-ts.c | 42 +++++-----------------------
 1 file changed, 7 insertions(+), 35 deletions(-)

diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
index c5d9006588a2..cf9c9aa39f6e 100644
--- a/drivers/input/touchscreen/stmpe-ts.c
+++ b/drivers/input/touchscreen/stmpe-ts.c
@@ -30,8 +30,6 @@
  * with touchscreen controller
  */
 #define STMPE_REG_INT_STA		0x0B
-#define STMPE_REG_ADC_CTRL1		0x20
-#define STMPE_REG_ADC_CTRL2		0x21
 #define STMPE_REG_TSC_CTRL		0x40
 #define STMPE_REG_TSC_CFG		0x41
 #define STMPE_REG_FIFO_TH		0x4A
@@ -58,15 +56,6 @@
  * @idev: registered input device
  * @work: a work item used to scan the device
  * @dev: a pointer back to the MFD cell struct device*
- * @sample_time: ADC converstion time in number of clock.
- * (0 -> 36 clocks, 1 -> 44 clocks, 2 -> 56 clocks, 3 -> 64 clocks,
- * 4 -> 80 clocks, 5 -> 96 clocks, 6 -> 144 clocks),
- * recommended is 4.
- * @mod_12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
- * @ref_sel: ADC reference source
- * (0 -> internal reference, 1 -> external reference)
- * @adc_freq: ADC Clock speed
- * (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
  * @ave_ctrl: Sample average control
  * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples)
  * @touch_det_delay: Touch detect interrupt delay
@@ -88,10 +77,6 @@ struct stmpe_touch {
 	struct input_dev *idev;
 	struct delayed_work work;
 	struct device *dev;
-	u8 sample_time;
-	u8 mod_12b;
-	u8 ref_sel;
-	u8 adc_freq;
 	u8 ave_ctrl;
 	u8 touch_det_delay;
 	u8 settling;
@@ -192,7 +177,7 @@ static irqreturn_t stmpe_ts_handler(int irq, void *data)
 static int stmpe_init_hw(struct stmpe_touch *ts)
 {
 	int ret;
-	u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
+	u8 tsc_cfg, tsc_cfg_mask;
 	struct stmpe *stmpe = ts->stmpe;
 	struct device *dev = ts->dev;
 
@@ -202,22 +187,9 @@ static int stmpe_init_hw(struct stmpe_touch *ts)
 		return ret;
 	}
 
-	adc_ctrl1 = STMPE_SAMPLE_TIME(ts->sample_time) |
-		    STMPE_MOD_12B(ts->mod_12b) | STMPE_REF_SEL(ts->ref_sel);
-	adc_ctrl1_mask = STMPE_SAMPLE_TIME(0xff) | STMPE_MOD_12B(0xff) |
-			 STMPE_REF_SEL(0xff);
-
-	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
-			adc_ctrl1_mask, adc_ctrl1);
-	if (ret) {
-		dev_err(dev, "Could not setup ADC\n");
-		return ret;
-	}
-
-	ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
-			STMPE_ADC_FREQ(0xff), STMPE_ADC_FREQ(ts->adc_freq));
+	ret = stmpe811_adc_common_init(stmpe);
 	if (ret) {
-		dev_err(dev, "Could not setup ADC\n");
+		stmpe_disable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
 		return ret;
 	}
 
@@ -295,13 +267,13 @@ static void stmpe_ts_get_platform_info(struct platform_device *pdev,
 
 	if (np) {
 		if (!of_property_read_u32(np, "st,sample-time", &val))
-			ts->sample_time = val;
+			ts->stmpe->sample_time = val;
 		if (!of_property_read_u32(np, "st,mod-12b", &val))
-			ts->mod_12b = val;
+			ts->stmpe->mod_12b = val;
 		if (!of_property_read_u32(np, "st,ref-sel", &val))
-			ts->ref_sel = val;
+			ts->stmpe->ref_sel = val;
 		if (!of_property_read_u32(np, "st,adc-freq", &val))
-			ts->adc_freq = val;
+			ts->stmpe->adc_freq = val;
 		if (!of_property_read_u32(np, "st,ave-ctrl", &val))
 			ts->ave_ctrl = val;
 		if (!of_property_read_u32(np, "st,touch-det-delay", &val))
-- 
2.19.2

[PATCH v4 5/8] iio: adc: add STMPE ADC driver using IIO framework

[Philippe Schenker]

This adds an ADC driver for the STMPE device using the industrial
input/output interface. The driver supports raw reading of values.
The driver depends on the MFD STMPE driver. If the touchscreen
block is enabled too, only four of the 8 ADC channels are available.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

Changes in v4:
 - Moved MFD changes to a precursor patch
 - Moved stmpe-ts changes to a precursor patch
 - Created stmpe_read_temp and stmpe_read_voltage functions to make
   read_raw more readable
 - Added local lock instead of using indio_dev's mlock
 - Use be16_to_cpu() macro instead of bitshifting
 - Added stmpe_enable again to stmpe_adc_init_hw
 - Use devm_add_action_or_reset to get rid of the remove function
   (I tested if that actually works)

Changes in v3:
 - Removed COMPILE_TEST from dependings in Kconfig
 - Removed stmpe_adc_get_platform_info() function and integrated the
   few code lines in the other function

Changes in v2:
 - Code formatting
 - Removed unused includes
 - Defined the macro STMPE_START_ONE_TEMP_CONV with other macros.
 - Added new macro that defines the channel of the temperature sensor.
   Took new name for STMPE_MAX_ADC->STMPE_ADC_LAST_NR and used it
   throughout the code for better readability.
 - Added mutex_unlock where missing.

 drivers/iio/adc/Kconfig     |   7 +
 drivers/iio/adc/Makefile    |   1 +
 drivers/iio/adc/stmpe-adc.c | 368 ++++++++++++++++++++++++++++++++++++
 3 files changed, 376 insertions(+)
 create mode 100644 drivers/iio/adc/stmpe-adc.c

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a52fea8749a9..224f2067494d 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -734,6 +734,13 @@ config STM32_DFSDM_ADC
 	  This driver can also be built as a module.  If so, the module
 	  will be called stm32-dfsdm-adc.
 
+config STMPE_ADC
+	tristate "STMicroelectronics STMPE ADC driver"
+	depends on OF && MFD_STMPE
+	help
+	  Say yes here to build support for ST Microelectronics STMPE
+	  built-in ADC block (stmpe811).
+
 config STX104
 	tristate "Apex Embedded Systems STX104 driver"
 	depends on PC104 && X86
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index a6e6a0b659e2..cba889c30bf9 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
 obj-$(CONFIG_STM32_ADC) += stm32-adc.o
 obj-$(CONFIG_STM32_DFSDM_CORE) += stm32-dfsdm-core.o
 obj-$(CONFIG_STM32_DFSDM_ADC) += stm32-dfsdm-adc.o
+obj-$(CONFIG_STMPE_ADC) += stmpe-adc.o
 obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
 obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o
 obj-$(CONFIG_TI_ADC084S021) += ti-adc084s021.o
diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
new file mode 100644
index 000000000000..4333da19a097
--- /dev/null
+++ b/drivers/iio/adc/stmpe-adc.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  STMicroelectronics STMPE811 IIO ADC Driver
+ *
+ *  4 channel, 10/12-bit ADC
+ *
+ *  Copyright (C) 2013-2018 Toradex AG <stefan.agner@toradex.com>
+ */
+
+#include <linux/completion.h>
+#include <linux/err.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/stmpe.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+
+#define STMPE_REG_INT_STA		0x0B
+#define STMPE_REG_ADC_INT_EN		0x0E
+#define STMPE_REG_ADC_INT_STA		0x0F
+
+#define STMPE_REG_ADC_CTRL1		0x20
+#define STMPE_REG_ADC_CTRL2		0x21
+#define STMPE_REG_ADC_CAPT		0x22
+#define STMPE_REG_ADC_DATA_CH(channel)	(0x30 + 2 * (channel))
+
+#define STMPE_REG_TEMP_CTRL		0x60
+#define STMPE_TEMP_CTRL_ENABLE		BIT(0)
+#define STMPE_TEMP_CTRL_ACQ		BIT(1)
+#define STMPE_TEMP_CTRL_THRES_EN	BIT(3)
+#define STMPE_START_ONE_TEMP_CONV	(STMPE_TEMP_CTRL_ENABLE | \
+					STMPE_TEMP_CTRL_ACQ | \
+					STMPE_TEMP_CTRL_THRES_EN)
+#define STMPE_REG_TEMP_DATA		0x61
+#define STMPE_REG_TEMP_TH		0x63
+#define STMPE_ADC_LAST_NR		7
+#define STMPE_TEMP_CHANNEL		(STMPE_ADC_LAST_NR + 1)
+
+#define STMPE_ADC_CH(channel)		((1 << (channel)) & 0xff)
+
+#define STMPE_ADC_TIMEOUT		msecs_to_jiffies(1000)
+
+struct stmpe_adc {
+	struct stmpe *stmpe;
+	struct clk *clk;
+	struct device *dev;
+	struct mutex lock;
+
+	/* We are allocating plus one for the temperature channel */
+	struct iio_chan_spec stmpe_adc_iio_channels[STMPE_ADC_LAST_NR + 2];
+
+	struct completion completion;
+
+	u8 channel;
+	u32 value;
+};
+
+static int stmpe_read_voltage(struct stmpe_adc *info,
+		struct iio_chan_spec const *chan, int *val)
+{
+	long ret;
+
+	mutex_lock(&info->lock);
+
+	info->channel = (u8)chan->channel;
+
+	if (info->channel > STMPE_ADC_LAST_NR) {
+		mutex_unlock(&info->lock);
+		return -EINVAL;
+	}
+
+	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_EN,
+			STMPE_ADC_CH(info->channel));
+
+	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_CAPT,
+			STMPE_ADC_CH(info->channel));
+
+	*val = info->value;
+
+	ret = wait_for_completion_interruptible_timeout
+		(&info->completion, STMPE_ADC_TIMEOUT);
+
+	if (ret <= 0) {
+		mutex_unlock(&info->lock);
+		if (ret == 0)
+			return -ETIMEDOUT;
+		else
+			return ret;
+	}
+
+	*val = info->value;
+
+	mutex_unlock(&info->lock);
+
+	return 0;
+}
+
+static int stmpe_read_temp(struct stmpe_adc *info,
+		struct iio_chan_spec const *chan, int *val)
+{
+	long ret;
+
+	mutex_lock(&info->lock);
+
+	info->channel = (u8)chan->channel;
+
+	if (info->channel != STMPE_TEMP_CHANNEL) {
+		mutex_unlock(&info->lock);
+		return -EINVAL;
+	}
+
+	stmpe_reg_write(info->stmpe, STMPE_REG_TEMP_CTRL,
+			STMPE_START_ONE_TEMP_CONV);
+
+	ret = wait_for_completion_interruptible_timeout
+		(&info->completion, STMPE_ADC_TIMEOUT);
+
+	if (ret <= 0) {
+		mutex_unlock(&info->lock);
+		if (ret == 0)
+			return -ETIMEDOUT;
+		else
+			return ret;
+	}
+
+	/*
+	 * absolute temp = +V3.3 * value /7.51 [K]
+	 * scale to [milli °C]
+	 */
+	*val = ((449960l * info->value) / 1024l) - 273150;
+
+	mutex_unlock(&info->lock);
+
+	return 0;
+}
+
+static int stmpe_read_raw(struct iio_dev *indio_dev,
+			  struct iio_chan_spec const *chan,
+			  int *val,
+			  int *val2,
+			  long mask)
+{
+	struct stmpe_adc *info = iio_priv(indio_dev);
+	long ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+	case IIO_CHAN_INFO_PROCESSED:
+
+		switch (chan->type) {
+		case IIO_VOLTAGE:
+			ret = stmpe_read_voltage(info, chan, val);
+			break;
+
+		case IIO_TEMP:
+			ret = stmpe_read_temp(info, chan, val);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		if (ret < 0)
+			return ret;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		*val = 3300;
+		*val2 = info->stmpe->mod_12b ? 12 : 10;
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+static irqreturn_t stmpe_adc_isr(int irq, void *dev_id)
+{
+	struct stmpe_adc *info = (struct stmpe_adc *)dev_id;
+	u16 data;
+
+	if (info->channel > STMPE_TEMP_CHANNEL)
+		return IRQ_NONE;
+
+	if (info->channel <= STMPE_ADC_LAST_NR) {
+		int int_sta;
+
+		int_sta = stmpe_reg_read(info->stmpe, STMPE_REG_ADC_INT_STA);
+
+		/* Is the interrupt relevant */
+		if (!(int_sta & STMPE_ADC_CH(info->channel)))
+			return IRQ_NONE;
+
+		/* Read value */
+		stmpe_block_read(info->stmpe,
+			STMPE_REG_ADC_DATA_CH(info->channel), 2, (u8 *) &data);
+
+		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA, int_sta);
+	} else if (info->channel == STMPE_TEMP_CHANNEL) {
+		/* Read value */
+		stmpe_block_read(info->stmpe, STMPE_REG_TEMP_DATA, 2,
+				(u8 *) &data);
+	}
+
+	info->value = (u32) be16_to_cpu(data);
+	complete(&info->completion);
+
+	return IRQ_HANDLED;
+}
+
+static const struct iio_info stmpe_adc_iio_info = {
+	.read_raw = &stmpe_read_raw,
+};
+
+static void stmpe_adc_voltage_chan(struct iio_chan_spec *ics, int chan)
+{
+	ics->type = IIO_VOLTAGE;
+	ics->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
+	ics->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
+	ics->indexed = 1;
+	ics->channel = chan;
+}
+
+static void stmpe_adc_temp_chan(struct iio_chan_spec *ics, int chan)
+{
+	ics->type = IIO_TEMP;
+	ics->info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED);
+	ics->indexed = 1;
+	ics->channel = chan;
+}
+
+static int stmpe_adc_init_hw(struct stmpe_adc *adc)
+{
+	int ret;
+	struct stmpe *stmpe = adc->stmpe;
+
+	ret = stmpe_enable(stmpe, STMPE_BLOCK_ADC);
+	if (ret) {
+		dev_err(stmpe->dev, "Could not enable clock for ADC\n");
+		return ret;
+	}
+
+	ret = stmpe811_adc_common_init(stmpe);
+	if (ret) {
+		stmpe_disable(stmpe, STMPE_BLOCK_ADC);
+		return ret;
+	}
+
+	/* use temp irq for each conversion completion */
+	stmpe_reg_write(stmpe, STMPE_REG_TEMP_TH, 0);
+	stmpe_reg_write(stmpe, STMPE_REG_TEMP_TH + 1, 0);
+
+	return 0;
+}
+
+static int stmpe_adc_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = NULL;
+	struct stmpe_adc *info = NULL;
+	struct device_node *np;
+	u32 norequest_mask = 0;
+	int irq_temp, irq_adc;
+	int num_chan = 0;
+	int i = 0;
+	int ret;
+
+	irq_adc = platform_get_irq_byname(pdev, "STMPE_ADC");
+	if (irq_adc < 0)
+		return irq_adc;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct stmpe_adc));
+	if (!indio_dev) {
+		dev_err(&pdev->dev, "failed allocating iio device\n");
+		return -ENOMEM;
+	}
+
+	info = iio_priv(indio_dev);
+	mutex_init(&info->lock);
+
+	init_completion(&info->completion);
+	ret = devm_request_threaded_irq(&pdev->dev, irq_adc, NULL,
+					stmpe_adc_isr, IRQF_ONESHOT,
+					"stmpe-adc", info);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
+				irq_adc);
+		return ret;
+	}
+
+	irq_temp = platform_get_irq_byname(pdev, "STMPE_TEMP_SENS");
+	if (irq_temp >= 0) {
+		ret = devm_request_threaded_irq(&pdev->dev, irq_temp, NULL,
+						stmpe_adc_isr, IRQF_ONESHOT,
+						"stmpe-adc", info);
+		if (ret < 0)
+			dev_warn(&pdev->dev, "failed requesting irq for"
+				 " temp sensor, irq = %d\n", irq_temp);
+	}
+
+	platform_set_drvdata(pdev, indio_dev);
+
+	indio_dev->name		= dev_name(&pdev->dev);
+	indio_dev->dev.parent	= &pdev->dev;
+	indio_dev->info		= &stmpe_adc_iio_info;
+	indio_dev->modes	= INDIO_DIRECT_MODE;
+
+	info->stmpe = dev_get_drvdata(pdev->dev.parent);
+
+	np = pdev->dev.of_node;
+
+	if (!np)
+		dev_err(&pdev->dev, "no device tree node found\n");
+
+	of_property_read_u32(np, "st,norequest-mask", &norequest_mask);
+
+	for_each_clear_bit(i, (unsigned long *) &norequest_mask,
+			   (STMPE_ADC_LAST_NR + 1)) {
+		stmpe_adc_voltage_chan(&info->stmpe_adc_iio_channels[num_chan], i);
+		num_chan++;
+	}
+	stmpe_adc_temp_chan(&info->stmpe_adc_iio_channels[num_chan], i);
+	num_chan++;
+	indio_dev->channels = info->stmpe_adc_iio_channels;
+	indio_dev->num_channels = num_chan;
+
+	ret = stmpe_adc_init_hw(info);
+	if (ret)
+		return ret;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(&pdev->dev,
+			(void (*)(void *))iio_device_unregister, indio_dev);
+}
+
+static int __maybe_unused stmpe_adc_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct stmpe_adc *info = iio_priv(indio_dev);
+
+	stmpe_adc_init_hw(info);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(stmpe_adc_pm_ops, NULL, stmpe_adc_resume);
+
+static struct platform_driver stmpe_adc_driver = {
+	.probe		= stmpe_adc_probe,
+	.driver		= {
+		.name	= "stmpe-adc",
+		.pm	= &stmpe_adc_pm_ops,
+	},
+};
+
+module_platform_driver(stmpe_adc_driver);
+
+MODULE_AUTHOR("Stefan Agner <stefan.agner@toradex.com>");
+MODULE_DESCRIPTION("STMPEXXX ADC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:stmpe-adc");
-- 
2.19.2

Re: [PATCH v4 5/8] iio: adc: add STMPE ADC driver using IIO framework

[Jonathan Cameron]

On Wed, 12 Dec 2018 14:06:46 +0100
Philippe Schenker <dev@pschenker.ch> wrote:

> This adds an ADC driver for the STMPE device using the industrial
> input/output interface. The driver supports raw reading of values.
> The driver depends on the MFD STMPE driver. If the touchscreen
> block is enabled too, only four of the 8 ADC channels are available.
> 
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>

Hi.

A few trivial comments inline.  Fix those up and you can add my
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Thanks,

Jonathan

> ---
> 
> Changes in v4:
>  - Moved MFD changes to a precursor patch
>  - Moved stmpe-ts changes to a precursor patch
>  - Created stmpe_read_temp and stmpe_read_voltage functions to make
>    read_raw more readable
>  - Added local lock instead of using indio_dev's mlock
>  - Use be16_to_cpu() macro instead of bitshifting
>  - Added stmpe_enable again to stmpe_adc_init_hw
>  - Use devm_add_action_or_reset to get rid of the remove function
>    (I tested if that actually works)
> 
> Changes in v3:
>  - Removed COMPILE_TEST from dependings in Kconfig
>  - Removed stmpe_adc_get_platform_info() function and integrated the
>    few code lines in the other function
> 
> Changes in v2:
>  - Code formatting
>  - Removed unused includes
>  - Defined the macro STMPE_START_ONE_TEMP_CONV with other macros.
>  - Added new macro that defines the channel of the temperature sensor.
>    Took new name for STMPE_MAX_ADC->STMPE_ADC_LAST_NR and used it
>    throughout the code for better readability.
>  - Added mutex_unlock where missing.
> 
>  drivers/iio/adc/Kconfig     |   7 +
>  drivers/iio/adc/Makefile    |   1 +
>  drivers/iio/adc/stmpe-adc.c | 368 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 376 insertions(+)
>  create mode 100644 drivers/iio/adc/stmpe-adc.c
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index a52fea8749a9..224f2067494d 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -734,6 +734,13 @@ config STM32_DFSDM_ADC
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called stm32-dfsdm-adc.
>  
> +config STMPE_ADC
> +	tristate "STMicroelectronics STMPE ADC driver"
> +	depends on OF && MFD_STMPE
> +	help
> +	  Say yes here to build support for ST Microelectronics STMPE
> +	  built-in ADC block (stmpe811).
> +
>  config STX104
>  	tristate "Apex Embedded Systems STX104 driver"
>  	depends on PC104 && X86
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index a6e6a0b659e2..cba889c30bf9 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -69,6 +69,7 @@ obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
>  obj-$(CONFIG_STM32_ADC) += stm32-adc.o
>  obj-$(CONFIG_STM32_DFSDM_CORE) += stm32-dfsdm-core.o
>  obj-$(CONFIG_STM32_DFSDM_ADC) += stm32-dfsdm-adc.o
> +obj-$(CONFIG_STMPE_ADC) += stmpe-adc.o
>  obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
>  obj-$(CONFIG_TI_ADC0832) += ti-adc0832.o
>  obj-$(CONFIG_TI_ADC084S021) += ti-adc084s021.o
> diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
> new file mode 100644
> index 000000000000..4333da19a097
> --- /dev/null
> +++ b/drivers/iio/adc/stmpe-adc.c
> @@ -0,0 +1,368 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + *  STMicroelectronics STMPE811 IIO ADC Driver
> + *
> + *  4 channel, 10/12-bit ADC
> + *
> + *  Copyright (C) 2013-2018 Toradex AG <stefan.agner@toradex.com>
> + */
> +
> +#include <linux/completion.h>
> +#include <linux/err.h>
> +#include <linux/iio/iio.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/stmpe.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/device.h>
> +
> +#define STMPE_REG_INT_STA		0x0B
> +#define STMPE_REG_ADC_INT_EN		0x0E
> +#define STMPE_REG_ADC_INT_STA		0x0F
> +
> +#define STMPE_REG_ADC_CTRL1		0x20
> +#define STMPE_REG_ADC_CTRL2		0x21
> +#define STMPE_REG_ADC_CAPT		0x22
> +#define STMPE_REG_ADC_DATA_CH(channel)	(0x30 + 2 * (channel))
> +
> +#define STMPE_REG_TEMP_CTRL		0x60
> +#define STMPE_TEMP_CTRL_ENABLE		BIT(0)
> +#define STMPE_TEMP_CTRL_ACQ		BIT(1)
> +#define STMPE_TEMP_CTRL_THRES_EN	BIT(3)
> +#define STMPE_START_ONE_TEMP_CONV	(STMPE_TEMP_CTRL_ENABLE | \
> +					STMPE_TEMP_CTRL_ACQ | \
> +					STMPE_TEMP_CTRL_THRES_EN)
> +#define STMPE_REG_TEMP_DATA		0x61
> +#define STMPE_REG_TEMP_TH		0x63
> +#define STMPE_ADC_LAST_NR		7
> +#define STMPE_TEMP_CHANNEL		(STMPE_ADC_LAST_NR + 1)
> +
> +#define STMPE_ADC_CH(channel)		((1 << (channel)) & 0xff)
> +
> +#define STMPE_ADC_TIMEOUT		msecs_to_jiffies(1000)
> +
> +struct stmpe_adc {
> +	struct stmpe *stmpe;
> +	struct clk *clk;
> +	struct device *dev;
> +	struct mutex lock;
> +
> +	/* We are allocating plus one for the temperature channel */
> +	struct iio_chan_spec stmpe_adc_iio_channels[STMPE_ADC_LAST_NR + 2];
> +
> +	struct completion completion;
> +
> +	u8 channel;
> +	u32 value;
> +};
> +
> +static int stmpe_read_voltage(struct stmpe_adc *info,
> +		struct iio_chan_spec const *chan, int *val)
> +{
> +	long ret;
> +
> +	mutex_lock(&info->lock);
> +
> +	info->channel = (u8)chan->channel;
> +
> +	if (info->channel > STMPE_ADC_LAST_NR) {
> +		mutex_unlock(&info->lock);
> +		return -EINVAL;
> +	}
> +
> +	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_EN,
> +			STMPE_ADC_CH(info->channel));
> +
> +	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_CAPT,
> +			STMPE_ADC_CH(info->channel));
> +
> +	*val = info->value;
> +
> +	ret = wait_for_completion_interruptible_timeout
> +		(&info->completion, STMPE_ADC_TIMEOUT);
> +
> +	if (ret <= 0) {
> +		mutex_unlock(&info->lock);
> +		if (ret == 0)
> +			return -ETIMEDOUT;
> +		else
> +			return ret;
> +	}
> +
> +	*val = info->value;
> +
> +	mutex_unlock(&info->lock);
> +
> +	return 0;
> +}
> +
> +static int stmpe_read_temp(struct stmpe_adc *info,
> +		struct iio_chan_spec const *chan, int *val)
> +{
> +	long ret;
> +
> +	mutex_lock(&info->lock);
> +
> +	info->channel = (u8)chan->channel;
> +
> +	if (info->channel != STMPE_TEMP_CHANNEL) {
> +		mutex_unlock(&info->lock);
> +		return -EINVAL;
> +	}
> +
> +	stmpe_reg_write(info->stmpe, STMPE_REG_TEMP_CTRL,
> +			STMPE_START_ONE_TEMP_CONV);
> +
> +	ret = wait_for_completion_interruptible_timeout
> +		(&info->completion, STMPE_ADC_TIMEOUT);
> +
> +	if (ret <= 0) {
> +		mutex_unlock(&info->lock);
> +		if (ret == 0)
> +			return -ETIMEDOUT;
> +		else
> +			return ret;
> +	}
> +
> +	/*
> +	 * absolute temp = +V3.3 * value /7.51 [K]
> +	 * scale to [milli °C]
> +	 */
> +	*val = ((449960l * info->value) / 1024l) - 273150;
> +
> +	mutex_unlock(&info->lock);
> +
> +	return 0;
> +}
> +
> +static int stmpe_read_raw(struct iio_dev *indio_dev,
> +			  struct iio_chan_spec const *chan,
> +			  int *val,
> +			  int *val2,
> +			  long mask)
> +{
> +	struct stmpe_adc *info = iio_priv(indio_dev);
> +	long ret;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +	case IIO_CHAN_INFO_PROCESSED:
> +
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			ret = stmpe_read_voltage(info, chan, val);
> +			break;
> +
> +		case IIO_TEMP:
> +			ret = stmpe_read_temp(info, chan, val);
> +			break;
> +		default:
> +			return -EINVAL;
> +		}
> +
> +		if (ret < 0)
> +			return ret;
> +
> +		return IIO_VAL_INT;
> +
> +	case IIO_CHAN_INFO_SCALE:
> +		*val = 3300;
> +		*val2 = info->stmpe->mod_12b ? 12 : 10;
> +		return IIO_VAL_FRACTIONAL_LOG2;
> +
> +	default:
> +		break;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static irqreturn_t stmpe_adc_isr(int irq, void *dev_id)
> +{
> +	struct stmpe_adc *info = (struct stmpe_adc *)dev_id;
> +	u16 data;
> +
> +	if (info->channel > STMPE_TEMP_CHANNEL)
> +		return IRQ_NONE;
> +
> +	if (info->channel <= STMPE_ADC_LAST_NR) {
> +		int int_sta;
> +
> +		int_sta = stmpe_reg_read(info->stmpe, STMPE_REG_ADC_INT_STA);
> +
> +		/* Is the interrupt relevant */
> +		if (!(int_sta & STMPE_ADC_CH(info->channel)))
> +			return IRQ_NONE;
> +
> +		/* Read value */
> +		stmpe_block_read(info->stmpe,
> +			STMPE_REG_ADC_DATA_CH(info->channel), 2, (u8 *) &data);
> +
> +		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA, int_sta);
> +	} else if (info->channel == STMPE_TEMP_CHANNEL) {
> +		/* Read value */
> +		stmpe_block_read(info->stmpe, STMPE_REG_TEMP_DATA, 2,
> +				(u8 *) &data);
> +	}
> +
> +	info->value = (u32) be16_to_cpu(data);
> +	complete(&info->completion);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static const struct iio_info stmpe_adc_iio_info = {
> +	.read_raw = &stmpe_read_raw,
> +};
> +
> +static void stmpe_adc_voltage_chan(struct iio_chan_spec *ics, int chan)
> +{
> +	ics->type = IIO_VOLTAGE;
> +	ics->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> +	ics->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
> +	ics->indexed = 1;
> +	ics->channel = chan;
> +}
> +
> +static void stmpe_adc_temp_chan(struct iio_chan_spec *ics, int chan)
> +{
> +	ics->type = IIO_TEMP;
> +	ics->info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED);
> +	ics->indexed = 1;
> +	ics->channel = chan;
> +}
> +
> +static int stmpe_adc_init_hw(struct stmpe_adc *adc)
> +{
> +	int ret;
> +	struct stmpe *stmpe = adc->stmpe;
> +
> +	ret = stmpe_enable(stmpe, STMPE_BLOCK_ADC);
> +	if (ret) {
> +		dev_err(stmpe->dev, "Could not enable clock for ADC\n");
> +		return ret;
> +	}
> +
> +	ret = stmpe811_adc_common_init(stmpe);
> +	if (ret) {
> +		stmpe_disable(stmpe, STMPE_BLOCK_ADC);
> +		return ret;
> +	}
> +
> +	/* use temp irq for each conversion completion */
> +	stmpe_reg_write(stmpe, STMPE_REG_TEMP_TH, 0);
> +	stmpe_reg_write(stmpe, STMPE_REG_TEMP_TH + 1, 0);
> +
> +	return 0;
> +}
> +
> +static int stmpe_adc_probe(struct platform_device *pdev)
> +{
> +	struct iio_dev *indio_dev = NULL;

No need to initialize. It's set in all the paths where it can be used.

> +	struct stmpe_adc *info = NULL;

Same with this one.

> +	struct device_node *np;
> +	u32 norequest_mask = 0;
> +	int irq_temp, irq_adc;
> +	int num_chan = 0;
> +	int i = 0;
> +	int ret;
> +
> +	irq_adc = platform_get_irq_byname(pdev, "STMPE_ADC");
> +	if (irq_adc < 0)
> +		return irq_adc;
> +
> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct stmpe_adc));
> +	if (!indio_dev) {
> +		dev_err(&pdev->dev, "failed allocating iio device\n");
> +		return -ENOMEM;
> +	}
> +
> +	info = iio_priv(indio_dev);
> +	mutex_init(&info->lock);
> +
> +	init_completion(&info->completion);
> +	ret = devm_request_threaded_irq(&pdev->dev, irq_adc, NULL,
> +					stmpe_adc_isr, IRQF_ONESHOT,
> +					"stmpe-adc", info);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
> +				irq_adc);
> +		return ret;
> +	}
> +
> +	irq_temp = platform_get_irq_byname(pdev, "STMPE_TEMP_SENS");
> +	if (irq_temp >= 0) {
> +		ret = devm_request_threaded_irq(&pdev->dev, irq_temp, NULL,
> +						stmpe_adc_isr, IRQF_ONESHOT,
> +						"stmpe-adc", info);
> +		if (ret < 0)
> +			dev_warn(&pdev->dev, "failed requesting irq for"
> +				 " temp sensor, irq = %d\n", irq_temp);
> +	}
> +
> +	platform_set_drvdata(pdev, indio_dev);
> +
> +	indio_dev->name		= dev_name(&pdev->dev);
> +	indio_dev->dev.parent	= &pdev->dev;
> +	indio_dev->info		= &stmpe_adc_iio_info;
> +	indio_dev->modes	= INDIO_DIRECT_MODE;
> +
> +	info->stmpe = dev_get_drvdata(pdev->dev.parent);
> +
> +	np = pdev->dev.of_node;
> +
> +	if (!np)
> +		dev_err(&pdev->dev, "no device tree node found\n");
> +
> +	of_property_read_u32(np, "st,norequest-mask", &norequest_mask);
> +
> +	for_each_clear_bit(i, (unsigned long *) &norequest_mask,
> +			   (STMPE_ADC_LAST_NR + 1)) {
> +		stmpe_adc_voltage_chan(&info->stmpe_adc_iio_channels[num_chan], i);
> +		num_chan++;
> +	}
> +	stmpe_adc_temp_chan(&info->stmpe_adc_iio_channels[num_chan], i);
> +	num_chan++;
> +	indio_dev->channels = info->stmpe_adc_iio_channels;
> +	indio_dev->num_channels = num_chan;
> +
> +	ret = stmpe_adc_init_hw(info);
> +	if (ret)
> +		return ret;
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret)
> +		return ret;
> +
> +	return devm_add_action_or_reset(&pdev->dev,
> +			(void (*)(void *))iio_device_unregister, indio_dev);

Why do this?

devm_iio_device_register exists which is basically the same thing but
more readable!

> +}
> +
> +static int __maybe_unused stmpe_adc_resume(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct stmpe_adc *info = iio_priv(indio_dev);
> +
> +	stmpe_adc_init_hw(info);
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(stmpe_adc_pm_ops, NULL, stmpe_adc_resume);
> +
> +static struct platform_driver stmpe_adc_driver = {
> +	.probe		= stmpe_adc_probe,
> +	.driver		= {
> +		.name	= "stmpe-adc",
> +		.pm	= &stmpe_adc_pm_ops,
> +	},
> +};
> +
> +module_platform_driver(stmpe_adc_driver);
> +
> +MODULE_AUTHOR("Stefan Agner <stefan.agner@toradex.com>");
> +MODULE_DESCRIPTION("STMPEXXX ADC driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:stmpe-adc");

[PATCH v4 6/8] iio: adc: add STMPE ADC devicetree bindings

[Philippe Schenker]

From: Stefan Agner <stefan@agner.ch>

This adds the devicetree bindings for the STMPE ADC. And corrects a
typo in st,sample-time it is rather "6 -> 124 clocks" according
to the datasheet and not 144.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

Changes in v4:
 - Put reformatting in a separate precursor patch.

Changes in v3:
 - Reformatted documentation for touchscreen to use tabs and have a better
   overview of the settings.
 - Added note which adc-settings will take precedence.
 - changed typo in sample-time setting from 144 clocks to 124 clocks, as stated
   in the datasheet.

Changes in v2:
 - Moved the bindings for ADC to the overlying mfd.
 - Reformatted for better readability

 .../devicetree/bindings/iio/adc/stmpe-adc.txt | 21 ++++++++++++
 .../bindings/input/touchscreen/stmpe.txt      | 32 +++++++++----------
 .../devicetree/bindings/mfd/stmpe.txt         | 14 ++++++++
 3 files changed, 51 insertions(+), 16 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt

diff --git a/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
new file mode 100644
index 000000000000..480e66422625
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
@@ -0,0 +1,21 @@
+STMPE ADC driver
+----------------
+
+Required properties:
+ - compatible: "st,stmpe-adc"
+
+Optional properties:
+Note that the ADC is shared with the STMPE touchscreen. ADC related settings
+have to be done in the mfd.
+- st,norequest-mask: bitmask specifying which ADC channels should _not_ be
+  requestable due to different usage (e.g. touch)
+
+Node name must be stmpe_adc and should be child node of stmpe node to
+which it belongs.
+
+Example:
+
+	stmpe_adc {
+		compatible = "st,stmpe-adc";
+		st,norequest-mask = <0x0F>; /* dont use ADC CH3-0 */
+	};
diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
index 1d3f84308142..8e2b240882fa 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
@@ -5,18 +5,6 @@ Required properties:
  - compatible: "st,stmpe-ts"
 
 Optional properties:
-- st,sample-time	: ADC conversion time in number of clock.
-				0 -> 36 clocks		4 -> 80 clocks (recommended)
-				1 -> 44 clocks		5 -> 96 clocks
-				2 -> 56 clocks		6 -> 144 clocks
-				3 -> 64 clocks
-- st,mod-12b		: ADC Bit mode
-				0 -> 10bit ADC		1 -> 12bit ADC
-- st,ref-sel		: ADC reference source
-				0 -> internal		1 -> external
-- st,adc-freq		: ADC Clock speed
-				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
-				1 -> 3.25 MHz
 - st,ave-ctrl		: Sample average control
 				0 -> 1 sample
 				1 -> 2 samples
@@ -40,17 +28,29 @@ Optional properties:
 				0 -> 20 mA (typical 35mA max)
 				1 -> 50 mA (typical 80 mA max)
 
+Optional properties common with MFD (deprecated):
+ - st,sample-time	: ADC conversion time in number of clock.
+				0 -> 36 clocks		4 -> 80 clocks (recommended)
+				1 -> 44 clocks		5 -> 96 clocks
+				2 -> 56 clocks		6 -> 124 clocks
+				3 -> 64 clocks
+ - st,mod-12b		: ADC Bit mode
+				0 -> 10bit ADC		1 -> 12bit ADC
+ - st,ref-sel		: ADC reference source
+				0 -> internal		1 -> external
+ - st,adc-freq		: ADC Clock speed
+				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
+				1 -> 3.25 MHz
+
 Node name must be stmpe_touchscreen and should be child node of stmpe node to
 which it belongs.
 
+Note that common ADC settings of stmpe_touchscreen will take precedence.
+
 Example:
 
 	stmpe_touchscreen {
 		compatible = "st,stmpe-ts";
-		st,sample-time = <4>;
-		st,mod-12b = <1>;
-		st,ref-sel = <0>;
-		st,adc-freq = <1>;
 		st,ave-ctrl = <1>;
 		st,touch-det-delay = <2>;
 		st,settling = <2>;
diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
index a46e7177195d..d4408a417193 100644
--- a/Documentation/devicetree/bindings/mfd/stmpe.txt
+++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
@@ -14,6 +14,20 @@ Optional properties:
  - st,autosleep-timeout		: Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
  - irq-gpio			: If present, which GPIO to use for event IRQ
 
+Optional properties for devices with touch and ADC (STMPE811|STMPE610):
+ - st,sample-time		: ADC conversion time in number of clock.
+					0 -> 36 clocks		4 -> 80 clocks (recommended)
+					1 -> 44 clocks		5 -> 96 clocks
+					2 -> 56 clocks		6 -> 124 clocks
+					3 -> 64 clocks
+ - st,mod-12b			: ADC Bit mode
+					0 -> 10bit ADC		1 -> 12bit ADC
+ - st,ref-sel			: ADC reference source
+					0 -> internal		1 -> external
+ - st,adc-freq			: ADC Clock speed
+					0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
+					1 -> 3.25 MHz
+
 Example:
 
 	stmpe1601: stmpe1601@40 {
-- 
2.19.2

Re: [PATCH v4 6/8] iio: adc: add STMPE ADC devicetree bindings

[Jonathan Cameron]

On Wed, 12 Dec 2018 14:06:47 +0100
Philippe Schenker <dev@pschenker.ch> wrote:

> From: Stefan Agner <stefan@agner.ch>
> 
> This adds the devicetree bindings for the STMPE ADC. And corrects a
> typo in st,sample-time it is rather "6 -> 124 clocks" according
> to the datasheet and not 144.
> 
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>

This still conflates a couple of different things but we can argue
about patch separation for ever so never mind.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
> 
> Changes in v4:
>  - Put reformatting in a separate precursor patch.
> 
> Changes in v3:
>  - Reformatted documentation for touchscreen to use tabs and have a better
>    overview of the settings.
>  - Added note which adc-settings will take precedence.
>  - changed typo in sample-time setting from 144 clocks to 124 clocks, as stated
>    in the datasheet.
> 
> Changes in v2:
>  - Moved the bindings for ADC to the overlying mfd.
>  - Reformatted for better readability
> 
>  .../devicetree/bindings/iio/adc/stmpe-adc.txt | 21 ++++++++++++
>  .../bindings/input/touchscreen/stmpe.txt      | 32 +++++++++----------
>  .../devicetree/bindings/mfd/stmpe.txt         | 14 ++++++++
>  3 files changed, 51 insertions(+), 16 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> new file mode 100644
> index 000000000000..480e66422625
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> @@ -0,0 +1,21 @@
> +STMPE ADC driver
> +----------------
> +
> +Required properties:
> + - compatible: "st,stmpe-adc"
> +
> +Optional properties:
> +Note that the ADC is shared with the STMPE touchscreen. ADC related settings
> +have to be done in the mfd.
> +- st,norequest-mask: bitmask specifying which ADC channels should _not_ be
> +  requestable due to different usage (e.g. touch)
> +
> +Node name must be stmpe_adc and should be child node of stmpe node to
> +which it belongs.
> +
> +Example:
> +
> +	stmpe_adc {
> +		compatible = "st,stmpe-adc";
> +		st,norequest-mask = <0x0F>; /* dont use ADC CH3-0 */
> +	};
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> index 1d3f84308142..8e2b240882fa 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> @@ -5,18 +5,6 @@ Required properties:
>   - compatible: "st,stmpe-ts"
>  
>  Optional properties:
> -- st,sample-time	: ADC conversion time in number of clock.
> -				0 -> 36 clocks		4 -> 80 clocks (recommended)
> -				1 -> 44 clocks		5 -> 96 clocks
> -				2 -> 56 clocks		6 -> 144 clocks
> -				3 -> 64 clocks
> -- st,mod-12b		: ADC Bit mode
> -				0 -> 10bit ADC		1 -> 12bit ADC
> -- st,ref-sel		: ADC reference source
> -				0 -> internal		1 -> external
> -- st,adc-freq		: ADC Clock speed
> -				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> -				1 -> 3.25 MHz
>  - st,ave-ctrl		: Sample average control
>  				0 -> 1 sample
>  				1 -> 2 samples
> @@ -40,17 +28,29 @@ Optional properties:
>  				0 -> 20 mA (typical 35mA max)
>  				1 -> 50 mA (typical 80 mA max)
>  
> +Optional properties common with MFD (deprecated):
> + - st,sample-time	: ADC conversion time in number of clock.
> +				0 -> 36 clocks		4 -> 80 clocks (recommended)
> +				1 -> 44 clocks		5 -> 96 clocks
> +				2 -> 56 clocks		6 -> 124 clocks
> +				3 -> 64 clocks
> + - st,mod-12b		: ADC Bit mode
> +				0 -> 10bit ADC		1 -> 12bit ADC
> + - st,ref-sel		: ADC reference source
> +				0 -> internal		1 -> external
> + - st,adc-freq		: ADC Clock speed
> +				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> +				1 -> 3.25 MHz
> +
>  Node name must be stmpe_touchscreen and should be child node of stmpe node to
>  which it belongs.
>  
> +Note that common ADC settings of stmpe_touchscreen will take precedence.
> +
>  Example:
>  
>  	stmpe_touchscreen {
>  		compatible = "st,stmpe-ts";
> -		st,sample-time = <4>;
> -		st,mod-12b = <1>;
> -		st,ref-sel = <0>;
> -		st,adc-freq = <1>;
>  		st,ave-ctrl = <1>;
>  		st,touch-det-delay = <2>;
>  		st,settling = <2>;
> diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
> index a46e7177195d..d4408a417193 100644
> --- a/Documentation/devicetree/bindings/mfd/stmpe.txt
> +++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
> @@ -14,6 +14,20 @@ Optional properties:
>   - st,autosleep-timeout		: Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
>   - irq-gpio			: If present, which GPIO to use for event IRQ
>  
> +Optional properties for devices with touch and ADC (STMPE811|STMPE610):
> + - st,sample-time		: ADC conversion time in number of clock.
> +					0 -> 36 clocks		4 -> 80 clocks (recommended)
> +					1 -> 44 clocks		5 -> 96 clocks
> +					2 -> 56 clocks		6 -> 124 clocks
> +					3 -> 64 clocks
> + - st,mod-12b			: ADC Bit mode
> +					0 -> 10bit ADC		1 -> 12bit ADC
> + - st,ref-sel			: ADC reference source
> +					0 -> internal		1 -> external
> + - st,adc-freq			: ADC Clock speed
> +					0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> +					1 -> 3.25 MHz
> +
>  Example:
>  
>  	stmpe1601: stmpe1601@40 {

Re: [PATCH v4 6/8] iio: adc: add STMPE ADC devicetree bindings

[Rob Herring]

On Wed, Dec 12, 2018 at 02:06:47PM +0100, Philippe Schenker wrote:
> From: Stefan Agner <stefan@agner.ch>
> 
> This adds the devicetree bindings for the STMPE ADC. And corrects a
> typo in st,sample-time it is rather "6 -> 124 clocks" according
> to the datasheet and not 144.
> 
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
> ---
> 
> Changes in v4:
>  - Put reformatting in a separate precursor patch.
> 
> Changes in v3:
>  - Reformatted documentation for touchscreen to use tabs and have a better
>    overview of the settings.
>  - Added note which adc-settings will take precedence.
>  - changed typo in sample-time setting from 144 clocks to 124 clocks, as stated
>    in the datasheet.
> 
> Changes in v2:
>  - Moved the bindings for ADC to the overlying mfd.
>  - Reformatted for better readability
> 
>  .../devicetree/bindings/iio/adc/stmpe-adc.txt | 21 ++++++++++++
>  .../bindings/input/touchscreen/stmpe.txt      | 32 +++++++++----------
>  .../devicetree/bindings/mfd/stmpe.txt         | 14 ++++++++
>  3 files changed, 51 insertions(+), 16 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> new file mode 100644
> index 000000000000..480e66422625
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
> @@ -0,0 +1,21 @@
> +STMPE ADC driver
> +----------------
> +
> +Required properties:
> + - compatible: "st,stmpe-adc"
> +
> +Optional properties:
> +Note that the ADC is shared with the STMPE touchscreen. ADC related settings
> +have to be done in the mfd.
> +- st,norequest-mask: bitmask specifying which ADC channels should _not_ be
> +  requestable due to different usage (e.g. touch)
> +
> +Node name must be stmpe_adc and should be child node of stmpe node to
> +which it belongs.
> +
> +Example:
> +
> +	stmpe_adc {
> +		compatible = "st,stmpe-adc";
> +		st,norequest-mask = <0x0F>; /* dont use ADC CH3-0 */
> +	};
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> index 1d3f84308142..8e2b240882fa 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> @@ -5,18 +5,6 @@ Required properties:
>   - compatible: "st,stmpe-ts"
>  
>  Optional properties:
> -- st,sample-time	: ADC conversion time in number of clock.
> -				0 -> 36 clocks		4 -> 80 clocks (recommended)
> -				1 -> 44 clocks		5 -> 96 clocks
> -				2 -> 56 clocks		6 -> 144 clocks
> -				3 -> 64 clocks
> -- st,mod-12b		: ADC Bit mode
> -				0 -> 10bit ADC		1 -> 12bit ADC
> -- st,ref-sel		: ADC reference source
> -				0 -> internal		1 -> external
> -- st,adc-freq		: ADC Clock speed
> -				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> -				1 -> 3.25 MHz
>  - st,ave-ctrl		: Sample average control
>  				0 -> 1 sample
>  				1 -> 2 samples
> @@ -40,17 +28,29 @@ Optional properties:
>  				0 -> 20 mA (typical 35mA max)
>  				1 -> 50 mA (typical 80 mA max)
>  
> +Optional properties common with MFD (deprecated):
> + - st,sample-time	: ADC conversion time in number of clock.
> +				0 -> 36 clocks		4 -> 80 clocks (recommended)
> +				1 -> 44 clocks		5 -> 96 clocks
> +				2 -> 56 clocks		6 -> 124 clocks
> +				3 -> 64 clocks
> + - st,mod-12b		: ADC Bit mode
> +				0 -> 10bit ADC		1 -> 12bit ADC
> + - st,ref-sel		: ADC reference source
> +				0 -> internal		1 -> external
> + - st,adc-freq		: ADC Clock speed
> +				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> +				1 -> 3.25 MHz
> +
>  Node name must be stmpe_touchscreen and should be child node of stmpe node to
>  which it belongs.
>  
> +Note that common ADC settings of stmpe_touchscreen will take precedence.

This isn't clear. The parent or child properties take precedence?

> +
>  Example:
>  
>  	stmpe_touchscreen {
>  		compatible = "st,stmpe-ts";
> -		st,sample-time = <4>;
> -		st,mod-12b = <1>;
> -		st,ref-sel = <0>;
> -		st,adc-freq = <1>;

It would be nice to see an example with both ADC and touchscreen.

>  		st,ave-ctrl = <1>;
>  		st,touch-det-delay = <2>;
>  		st,settling = <2>;
> diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
> index a46e7177195d..d4408a417193 100644
> --- a/Documentation/devicetree/bindings/mfd/stmpe.txt
> +++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
> @@ -14,6 +14,20 @@ Optional properties:
>   - st,autosleep-timeout		: Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
>   - irq-gpio			: If present, which GPIO to use for event IRQ
>  
> +Optional properties for devices with touch and ADC (STMPE811|STMPE610):
> + - st,sample-time		: ADC conversion time in number of clock.
> +					0 -> 36 clocks		4 -> 80 clocks (recommended)
> +					1 -> 44 clocks		5 -> 96 clocks
> +					2 -> 56 clocks		6 -> 124 clocks
> +					3 -> 64 clocks
> + - st,mod-12b			: ADC Bit mode
> +					0 -> 10bit ADC		1 -> 12bit ADC
> + - st,ref-sel			: ADC reference source
> +					0 -> internal		1 -> external
> + - st,adc-freq			: ADC Clock speed
> +					0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> +					1 -> 3.25 MHz
> +
>  Example:
>  
>  	stmpe1601: stmpe1601@40 {
> -- 
> 2.19.2
> 

[PATCH v4 7/8] ARM: dts: Add stmpe-adc DT node to Toradex iMX6 modules

[Philippe Schenker]

From: Philippe Schenker <philippe.schenker@toradex.com>

Add the stmpe-adc DT node as found on Toradex iMX6 modules

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

Changes in v4:
 - Moved T30 devicetree settings to separate commit

Changes in v3:
 - None

Changes in v2:
 - Put common ADC settings in mfd

 arch/arm/boot/dts/imx6qdl-apalis.dtsi  | 22 ++++++++++++++--------
 arch/arm/boot/dts/imx6qdl-colibri.dtsi | 23 +++++++++++++++--------
 2 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
index 3dc99dd8dde1..8db476d8978d 100644
--- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
@@ -331,11 +331,18 @@
 		id = <0>;
 		blocks = <0x5>;
 		irq-trigger = <0x1>;
+		/* 3.25 MHz ADC clock speed */
+		st,adc-freq = <1>;
+		/* 12-bit ADC */
+		st,mod-12b = <1>;
+		/* internal ADC reference */
+		st,ref-sel = <0>;
+		/* ADC converstion time: 80 clocks */
+		st,sample-time = <4>;
+		/* forbid to use ADC channels 3-0 (touch) */
 
 		stmpe_touchscreen {
 			compatible = "st,stmpe-ts";
-			/* 3.25 MHz ADC clock speed */
-			st,adc-freq = <1>;
 			/* 8 sample average control */
 			st,ave-ctrl = <3>;
 			/* 7 length fractional part in z */
@@ -345,17 +352,16 @@
 			 * current limit value
 			 */
 			st,i-drive = <1>;
-			/* 12-bit ADC */
-			st,mod-12b = <1>;
-			/* internal ADC reference */
-			st,ref-sel = <0>;
-			/* ADC converstion time: 80 clocks */
-			st,sample-time = <4>;
 			/* 1 ms panel driver settling time */
 			st,settling = <3>;
 			/* 5 ms touch detect interrupt delay */
 			st,touch-det-delay = <5>;
 		};
+
+		stmpe_adc {
+			compatible = "st,stmpe-adc";
+			st,norequest-mask = <0x0F>;
+		};
 	};
 };
 
diff --git a/arch/arm/boot/dts/imx6qdl-colibri.dtsi b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
index 87e15e7cb32b..2e303d79c7f8 100644
--- a/arch/arm/boot/dts/imx6qdl-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
@@ -262,11 +262,18 @@
 		id = <0>;
 		blocks = <0x5>;
 		irq-trigger = <0x1>;
+		/* 3.25 MHz ADC clock speed */
+		st,adc-freq = <1>;
+		/* 12-bit ADC */
+		st,mod-12b = <1>;
+		/* internal ADC reference */
+		st,ref-sel = <0>;
+		/* ADC converstion time: 80 clocks */
+		st,sample-time = <4>;
+		/* forbid to use ADC channels 3-0 (touch) */
 
 		stmpe_touchscreen {
 			compatible = "st,stmpe-ts";
-			/* 3.25 MHz ADC clock speed */
-			st,adc-freq = <1>;
 			/* 8 sample average control */
 			st,ave-ctrl = <3>;
 			/* 7 length fractional part in z */
@@ -276,17 +283,17 @@
 			 * current limit value
 			 */
 			st,i-drive = <1>;
-			/* 12-bit ADC */
-			st,mod-12b = <1>;
-			/* internal ADC reference */
-			st,ref-sel = <0>;
-			/* ADC converstion time: 80 clocks */
-			st,sample-time = <4>;
 			/* 1 ms panel driver settling time */
 			st,settling = <3>;
 			/* 5 ms touch detect interrupt delay */
 			st,touch-det-delay = <5>;
 		};
+
+		stmpe_adc {
+			compatible = "st,stmpe-adc";
+			/* 3.25 MHz ADC clock speed */
+			st,norequest-mask = <0x0F>;
+		};
 	};
 };
 
-- 
2.19.2

[PATCH v4 8/8] ARM: dts: Add stmpe-adc DT node to Toradex T30 modules

[Philippe Schenker]

Add the stmpe-adc DT node as found on Toradex T30 modules

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---

Changes in v4:
 - New separate commit to hold T30 devicetree changes

Changes in v3: None
Changes in v2: None

 arch/arm/boot/dts/tegra30-apalis.dtsi  | 22 ++++++++++++++--------
 arch/arm/boot/dts/tegra30-colibri.dtsi | 22 ++++++++++++++--------
 2 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/arch/arm/boot/dts/tegra30-apalis.dtsi b/arch/arm/boot/dts/tegra30-apalis.dtsi
index 7f112f192fe9..850b0d13549a 100644
--- a/arch/arm/boot/dts/tegra30-apalis.dtsi
+++ b/arch/arm/boot/dts/tegra30-apalis.dtsi
@@ -976,11 +976,18 @@
 			id = <0>;
 			blocks = <0x5>;
 			irq-trigger = <0x1>;
+			/* 3.25 MHz ADC clock speed */
+			st,adc-freq = <1>;
+			/* 12-bit ADC */
+			st,mod-12b = <1>;
+			/* internal ADC reference */
+			st,ref-sel = <0>;
+			/* ADC converstion time: 80 clocks */
+			st,sample-time = <4>;
+			/* forbid to use ADC channels 3-0 (touch) */
 
 			stmpe_touchscreen {
 				compatible = "st,stmpe-ts";
-				/* 3.25 MHz ADC clock speed */
-				st,adc-freq = <1>;
 				/* 8 sample average control */
 				st,ave-ctrl = <3>;
 				/* 7 length fractional part in z */
@@ -990,17 +997,16 @@
 				 * current limit value
 				 */
 				st,i-drive = <1>;
-				/* 12-bit ADC */
-				st,mod-12b = <1>;
-				/* internal ADC reference */
-				st,ref-sel = <0>;
-				/* ADC converstion time: 80 clocks */
-				st,sample-time = <4>;
 				/* 1 ms panel driver settling time */
 				st,settling = <3>;
 				/* 5 ms touch detect interrupt delay */
 				st,touch-det-delay = <5>;
 			};
+
+			stmpe_adc {
+				compatible = "st,stmpe-adc";
+				st,norequest-mask = <0x0F>;
+			};
 		};
 
 		/*
diff --git a/arch/arm/boot/dts/tegra30-colibri.dtsi b/arch/arm/boot/dts/tegra30-colibri.dtsi
index 35af03ca9e90..1f9198bb24ff 100644
--- a/arch/arm/boot/dts/tegra30-colibri.dtsi
+++ b/arch/arm/boot/dts/tegra30-colibri.dtsi
@@ -845,11 +845,18 @@
 			id = <0>;
 			blocks = <0x5>;
 			irq-trigger = <0x1>;
+			/* 3.25 MHz ADC clock speed */
+			st,adc-freq = <1>;
+			/* 12-bit ADC */
+			st,mod-12b = <1>;
+			/* internal ADC reference */
+			st,ref-sel = <0>;
+			/* ADC converstion time: 80 clocks */
+			st,sample-time = <4>;
+			/* forbid to use ADC channels 3-0 (touch) */
 
 			stmpe_touchscreen {
 				compatible = "st,stmpe-ts";
-				/* 3.25 MHz ADC clock speed */
-				st,adc-freq = <1>;
 				/* 8 sample average control */
 				st,ave-ctrl = <3>;
 				/* 7 length fractional part in z */
@@ -859,17 +866,16 @@
 				 * current limit value
 				 */
 				st,i-drive = <1>;
-				/* 12-bit ADC */
-				st,mod-12b = <1>;
-				/* internal ADC reference */
-				st,ref-sel = <0>;
-				/* ADC converstion time: 80 clocks */
-				st,sample-time = <4>;
 				/* 1 ms panel driver settling time */
 				st,settling = <3>;
 				/* 5 ms touch detect interrupt delay */
 				st,touch-det-delay = <5>;
 			};
+
+			stmpe_adc {
+				compatible = "st,stmpe-adc";
+				st,norequest-mask = <0x0F>;
+			};
 		};
 
 		/*
-- 
2.19.2

Re: [PATCH v4 8/8] ARM: dts: Add stmpe-adc DT node to Toradex T30 modules

[Dmitry Osipenko]

Hello Philippe,

Please CC all the patches in the series to every recipient.

On 12.12.2018 16:06, Philippe Schenker wrote:
> Add the stmpe-adc DT node as found on Toradex T30 modules
> 
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
> ---
> 
> Changes in v4:
>  - New separate commit to hold T30 devicetree changes
> 
> Changes in v3: None
> Changes in v2: None
> 
>  arch/arm/boot/dts/tegra30-apalis.dtsi  | 22 ++++++++++++++--------
>  arch/arm/boot/dts/tegra30-colibri.dtsi | 22 ++++++++++++++--------
>  2 files changed, 28 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/tegra30-apalis.dtsi b/arch/arm/boot/dts/tegra30-apalis.dtsi
> index 7f112f192fe9..850b0d13549a 100644
> --- a/arch/arm/boot/dts/tegra30-apalis.dtsi
> +++ b/arch/arm/boot/dts/tegra30-apalis.dtsi
> @@ -976,11 +976,18 @@
>  			id = <0>;
>  			blocks = <0x5>;
>  			irq-trigger = <0x1>;
> +			/* 3.25 MHz ADC clock speed */
> +			st,adc-freq = <1>;
> +			/* 12-bit ADC */
> +			st,mod-12b = <1>;
> +			/* internal ADC reference */
> +			st,ref-sel = <0>;
> +			/* ADC converstion time: 80 clocks */
> +			st,sample-time = <4>;
> +			/* forbid to use ADC channels 3-0 (touch) */>  			stmpe_touchscreen {
>  				compatible = "st,stmpe-ts";
> -				/* 3.25 MHz ADC clock speed */
> -				st,adc-freq = <1>;
>  				/* 8 sample average control */
>  				st,ave-ctrl = <3>;
>  				/* 7 length fractional part in z */
> @@ -990,17 +997,16 @@
>  				 * current limit value
>  				 */
>  				st,i-drive = <1>;
> -				/* 12-bit ADC */
> -				st,mod-12b = <1>;
> -				/* internal ADC reference */
> -				st,ref-sel = <0>;
> -				/* ADC converstion time: 80 clocks */
> -				st,sample-time = <4>;

Does this change depend on some other patch in the series? Is this a backwards-compatible change? Please explain.

>  				/* 1 ms panel driver settling time */
>  				st,settling = <3>;
>  				/* 5 ms touch detect interrupt delay */
>  				st,touch-det-delay = <5>;
>  			};
> +
> +			stmpe_adc {
> +				compatible = "st,stmpe-adc";
> +				st,norequest-mask = <0x0F>;
> +			};
>  		};
>  
>  		/*
> diff --git a/arch/arm/boot/dts/tegra30-colibri.dtsi b/arch/arm/boot/dts/tegra30-colibri.dtsi
> index 35af03ca9e90..1f9198bb24ff 100644
> --- a/arch/arm/boot/dts/tegra30-colibri.dtsi
> +++ b/arch/arm/boot/dts/tegra30-colibri.dtsi
> @@ -845,11 +845,18 @@
>  			id = <0>;
>  			blocks = <0x5>;
>  			irq-trigger = <0x1>;
> +			/* 3.25 MHz ADC clock speed */
> +			st,adc-freq = <1>;
> +			/* 12-bit ADC */
> +			st,mod-12b = <1>;
> +			/* internal ADC reference */
> +			st,ref-sel = <0>;
> +			/* ADC converstion time: 80 clocks */
> +			st,sample-time = <4>;
> +			/* forbid to use ADC channels 3-0 (touch) */
>  
>  			stmpe_touchscreen {
>  				compatible = "st,stmpe-ts";
> -				/* 3.25 MHz ADC clock speed */
> -				st,adc-freq = <1>;
>  				/* 8 sample average control */
>  				st,ave-ctrl = <3>;
>  				/* 7 length fractional part in z */
> @@ -859,17 +866,16 @@
>  				 * current limit value
>  				 */
>  				st,i-drive = <1>;
> -				/* 12-bit ADC */
> -				st,mod-12b = <1>;
> -				/* internal ADC reference */
> -				st,ref-sel = <0>;
> -				/* ADC converstion time: 80 clocks */
> -				st,sample-time = <4>;
>  				/* 1 ms panel driver settling time */
>  				st,settling = <3>;
>  				/* 5 ms touch detect interrupt delay */
>  				st,touch-det-delay = <5>;
>  			};
> +
> +			stmpe_adc {
> +				compatible = "st,stmpe-adc";
> +				st,norequest-mask = <0x0F>;
> +			};
>  		};
>  
>  		/*
> 

Re: [PATCH v4 1/8] dt-bindings: stmpe: reformatting parameter list and use tabs only

[Rob Herring]

On Wed, Dec 12, 2018 at 02:06:42PM +0100, Philippe Schenker wrote:
> This patch reformats the parameter list for stmpe device in a
> table-style so it is more clear to read.
> 
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>

Need to fix the author and S-o-b emails to match.

> ---
> 
> Changes in v4:
>  - New separate precursor patch for holding reformatting
> 
> Changes in v3: None
> Changes in v2: None
> 
>  .../bindings/input/touchscreen/stmpe.txt      | 52 ++++++++++++-------
>  .../devicetree/bindings/mfd/stmpe.txt         | 14 ++---
>  2 files changed, 41 insertions(+), 25 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> index 127baa31a77a..1d3f84308142 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/stmpe.txt
> @@ -5,24 +5,40 @@ Required properties:
>   - compatible: "st,stmpe-ts"
>  
>  Optional properties:
> -- st,sample-time: ADC converstion time in number of clock.  (0 -> 36 clocks, 1 ->
> -  44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, 4 -> 80 clocks, 5 -> 96 clocks, 6
> -  -> 144 clocks), recommended is 4.
> -- st,mod-12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
> -- st,ref-sel: ADC reference source (0 -> internal reference, 1 -> external
> -  reference)
> -- st,adc-freq: ADC Clock speed (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
> -- st,ave-ctrl: Sample average control (0 -> 1 sample, 1 -> 2 samples, 2 -> 4
> -  samples, 3 -> 8 samples)
> -- st,touch-det-delay: Touch detect interrupt delay (0 -> 10 us, 1 -> 50 us, 2 ->
> -  100 us, 3 -> 500 us, 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) recommended
> -  is 3
> -- st,settling: Panel driver settling time (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3
> -  -> 1 ms, 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) recommended is 2
> -- st,fraction-z: Length of the fractional part in z (fraction-z ([0..7]) = Count of
> -  the fractional part) recommended is 7
> -- st,i-drive: current limit value of the touchscreen drivers (0 -> 20 mA typical 35
> -  mA max, 1 -> 50 mA typical 80 mA max)
> +- st,sample-time	: ADC conversion time in number of clock.
> +				0 -> 36 clocks		4 -> 80 clocks (recommended)
> +				1 -> 44 clocks		5 -> 96 clocks
> +				2 -> 56 clocks		6 -> 144 clocks
> +				3 -> 64 clocks

Just make this a 1 column list

> +- st,mod-12b		: ADC Bit mode
> +				0 -> 10bit ADC		1 -> 12bit ADC
> +- st,ref-sel		: ADC reference source
> +				0 -> internal		1 -> external
> +- st,adc-freq		: ADC Clock speed
> +				0 -> 1.625 MHz		2 || 3 -> 6.5 MHz
> +				1 -> 3.25 MHz
> +- st,ave-ctrl		: Sample average control
> +				0 -> 1 sample
> +				1 -> 2 samples
> +				2 -> 4 samples
> +				3 -> 8 samples
> +- st,touch-det-delay	: Touch detect interrupt delay (recommended is 3)
> +				0 -> 10 us		5 -> 5 ms
> +				1 -> 50 us		6 -> 10 ms
> +				2 -> 100 us		7 -> 50 ms
> +				3 -> 500 us
> +				4 -> 1 ms
> +- st,settling		: Panel driver settling time (recommended is 2)
> +				0 -> 10 us		5 -> 10 ms
> +				1 -> 100 us		6 for 50 ms
> +				2 -> 500 us		7 -> 100 ms
> +				3 -> 1 ms
> +				4 -> 5 ms
> +- st,fraction-z		: Length of the fractional part in z (recommended is 7)
> +			  (fraction-z ([0..7]) = Count of the fractional part)
> +- st,i-drive		: current limit value of the touchscreen drivers
> +				0 -> 20 mA (typical 35mA max)
> +				1 -> 50 mA (typical 80 mA max)
>  
>  Node name must be stmpe_touchscreen and should be child node of stmpe node to
>  which it belongs.
> diff --git a/Documentation/devicetree/bindings/mfd/stmpe.txt b/Documentation/devicetree/bindings/mfd/stmpe.txt
> index c797c05cd3c2..a46e7177195d 100644
> --- a/Documentation/devicetree/bindings/mfd/stmpe.txt
> +++ b/Documentation/devicetree/bindings/mfd/stmpe.txt
> @@ -4,15 +4,15 @@ STMPE is an MFD device which may expose the following inbuilt devices: gpio,
>  keypad, touchscreen, adc, pwm, rotator.
>  
>  Required properties:
> - - compatible                   : "st,stmpe[610|801|811|1600|1601|2401|2403]"
> - - reg                          : I2C/SPI address of the device
> + - compatible			: "st,stmpe[610|801|811|1600|1601|2401|2403]"
> + - reg				: I2C/SPI address of the device
>  
>  Optional properties:
> - - interrupts                   : The interrupt outputs from the controller
> - - interrupt-controller         : Marks the device node as an interrupt controller
> - - wakeup-source                : Marks the input device as wakable
> - - st,autosleep-timeout         : Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
> - - irq-gpio                     : If present, which GPIO to use for event IRQ
> + - interrupts			: The interrupt outputs from the controller
> + - interrupt-controller		: Marks the device node as an interrupt controller
> + - wakeup-source		: Marks the input device as wakable
> + - st,autosleep-timeout		: Valid entries (ms); 4, 16, 32, 64, 128, 256, 512 and 1024
> + - irq-gpio			: If present, which GPIO to use for event IRQ
>  
>  Example:
>  
> -- 
> 2.19.2
> 

Re: [PATCH v4 1/8] dt-bindings: stmpe: reformatting parameter list and use tabs only

[Lee Jones]

On Wed, 12 Dec 2018, Philippe Schenker wrote:

> This patch reformats the parameter list for stmpe device in a
> table-style so it is more clear to read.
> 
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
> ---
> 
> Changes in v4:
>  - New separate precursor patch for holding reformatting
> 
> Changes in v3: None
> Changes in v2: None
> 
>  .../bindings/input/touchscreen/stmpe.txt      | 52 ++++++++++++-------
>  .../devicetree/bindings/mfd/stmpe.txt         | 14 ++---
>  2 files changed, 41 insertions(+), 25 deletions(-)

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH v4 1/8] dt-bindings: stmpe: reformatting parameter list and use tabs only

[Lee Jones]

On Wed, 12 Dec 2018, Philippe Schenker wrote:

> This patch reformats the parameter list for stmpe device in a
> table-style so it is more clear to read.
> 
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
> ---
> 
> Changes in v4:
>  - New separate precursor patch for holding reformatting
> 
> Changes in v3: None
> Changes in v2: None
> 
>  .../bindings/input/touchscreen/stmpe.txt      | 52 ++++++++++++-------
>  .../devicetree/bindings/mfd/stmpe.txt         | 14 ++---
>  2 files changed, 41 insertions(+), 25 deletions(-)

Set looks okay.

Please submit a [RESEND] with all the Acks you've collected.

And next time, please make sure you author a 0th (cover-letter) patch.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog