am335x: TSC & ADC reworking including DT pieces, take 5

am335x: TSC & ADC reworking including DT pieces, take 5

[Sebastian Andrzej Siewior]

Hi Samuel,

I did the cosmetic changes of the subject line and removed the changes
from within the sob lines in each patch. I dropped the "#define XPP
STEPCONFIG_XPP" thingy and patch #1 which removed regmap from mfd. Not
that I agree with it, I just do not want to miss the merge window due to
this.

The following changes since commit d683b96b072dc4680fc74964eca77e6a23d1fa6e:

  Linux 3.10-rc4 (2013-06-02 17:11:17 +0900)

are available in the git repository at:

  git://breakpoint.cc/bigeasy/linux tags/am335x_tsc-adc

for you to fetch changes up to 1460c152c53335b5403045d056502eda1204c33a:

  iio: ti_am335x_adc: check if we found the value (2013-06-12 18:50:23 +0200)

----------------------------------------------------------------
A complete refurbished series inclunding:
- DT support for the MFD, TSC and ADC driver & platform device support,
  which has no users, has been killed.
- iio_map from last series is gone and replaced by proper nodes in the
  device tree.
- suspend fixes which means correct data structs are taken and no
  interrupt storm
- fifo split which should problem with TSC & ADC beeing used at the same
  time
- The ADC channels are now checked before blindly applied. That means the
  touch part reads X, Y and Z coordinates and does not mix them up. Same
  goes for the IIO ADC driver.
- The IIO ADC driver now creates files named in_voltageX_raw where X
  represents the ADC line instead of a number starting at 0. A read from
  this file can return -EBUSY in case touch is busy and the ADC didn't
  collect a value.

----------------------------------------------------------------
Pantelis Antoniou (2):
      iio: ti_tscadc: provide datasheet_name and scan_type
      mfd: ti_tscadc: deal with partial activation

Patil, Rachna (7):
      input: ti_am33x_tsc: Step enable bits made configurable
      input: ti_am33x_tsc: Order of TSC wires, made configurable
      input: ti_am33x_tsc: remove unwanted fifo flush
      input: ti_am33x_tsc: Add DT support
      iio: ti_am335x_adc: Add DT support
      mfd: ti_am335x_tscadc: Add DT support
      arm: am33xx: add TSC/ADC mfd device support

Sebastian Andrzej Siewior (12):
      mfd: input: iio: ti_am335x_adc: use one structure for ti_tscadc_dev
      input: ti_am33x_tsc: remove platform_data support
      iio: ti_am335x_adc: remove platform_data support
      mfd: ti_am335x_tscadc: remove platform_data support
      input: mfd: ti_am335x_tsc remove remaining platform data pieces
      mfd: input: ti_am335x_tsc: rename device from tsc to TI-am335x-tsc
      mfd: iio: ti_am335x_adc: rename device from tiadc to TI-am335x-adc
      input: ti_am335x_adc: use only FIFO0 and clean up a little
      input: ti_am335x_tsc: ACK the HW_PEN irq in ISR
      input: ti_am335x_tsc: return IRQ_NONE if there was no IRQ for us
      iio: ti_am335x_adc: Allow to specify input line
      iio: ti_am335x_adc: check if we found the value

 .../bindings/input/touchscreen/ti-tsc-adc.txt      |   44 +++
 arch/arm/boot/dts/am335x-evm.dts                   |   14 +
 arch/arm/boot/dts/am33xx.dtsi                      |   18 ++
 drivers/iio/adc/ti_am335x_adc.c                    |  132 ++++++---
 drivers/input/touchscreen/ti_am335x_tsc.c          |  288 ++++++++++++++------
 drivers/mfd/ti_am335x_tscadc.c                     |  112 ++++++--
 include/linux/input/ti_am335x_tsc.h                |   23 --
 include/linux/mfd/ti_am335x_tscadc.h               |   35 +--
 include/linux/platform_data/ti_am335x_adc.h        |   14 -
 9 files changed, 486 insertions(+), 194 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
 delete mode 100644 include/linux/input/ti_am335x_tsc.h
 delete mode 100644 include/linux/platform_data/ti_am335x_adc.h

Sebastian

[PATCH 01/21] mfd: input: iio: ti_am335x_adc: use one structure for ti_tscadc_dev

[Sebastian Andrzej Siewior]

The mfd driver creates platform data for the child devices and it is the
ti_tscadc_dev struct. This struct is copied for the two devices.
The copy of the structure makes a common lock in this structure a little
less usefull. Therefore the platform data is not a pointer to the
structure and the same structure is used.
While doing the change I noticed that the suspend/resume code assumes
the wrong pointer for ti_tscadc_dev and this has been fixed as well.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c           |    5 +++--
 drivers/input/touchscreen/ti_am335x_tsc.c |   16 +++++++++-------
 drivers/mfd/ti_am335x_tscadc.c            |    8 ++++----
 include/linux/mfd/ti_am335x_tscadc.h      |    7 +++++++
 4 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 5f9a7e7..9db352e 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -140,7 +140,7 @@ static int tiadc_probe(struct platform_device *pdev)
 {
 	struct iio_dev		*indio_dev;
 	struct tiadc_device	*adc_dev;
-	struct ti_tscadc_dev	*tscadc_dev = pdev->dev.platform_data;
+	struct ti_tscadc_dev	*tscadc_dev = ti_tscadc_dev_get(pdev);
 	struct mfd_tscadc_board	*pdata;
 	int			err;
 
@@ -205,9 +205,10 @@ static int tiadc_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
 	struct tiadc_device *adc_dev = iio_priv(indio_dev);
-	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
+	struct ti_tscadc_dev *tscadc_dev;
 	unsigned int idle;
 
+	tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
 	if (!device_may_wakeup(tscadc_dev->dev)) {
 		idle = tiadc_readl(adc_dev, REG_CTRL);
 		idle &= ~(CNTRLREG_TSCSSENB);
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 51e7b87..16077d3 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -262,7 +262,7 @@ static int titsc_probe(struct platform_device *pdev)
 {
 	struct titsc *ts_dev;
 	struct input_dev *input_dev;
-	struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
+	struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
 	struct mfd_tscadc_board	*pdata;
 	int err;
 
@@ -329,8 +329,8 @@ static int titsc_probe(struct platform_device *pdev)
 
 static int titsc_remove(struct platform_device *pdev)
 {
-	struct ti_tscadc_dev *tscadc_dev = pdev->dev.platform_data;
-	struct titsc *ts_dev = tscadc_dev->tsc;
+	struct titsc *ts_dev = platform_get_drvdata(pdev);
+	u32 steps;
 
 	free_irq(ts_dev->irq, ts_dev);
 
@@ -344,10 +344,11 @@ static int titsc_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int titsc_suspend(struct device *dev)
 {
-	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
-	struct titsc *ts_dev = tscadc_dev->tsc;
+	struct titsc *ts_dev = dev_get_drvdata(dev);
+	struct ti_tscadc_dev *tscadc_dev;
 	unsigned int idle;
 
+	tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
 	if (device_may_wakeup(tscadc_dev->dev)) {
 		idle = titsc_readl(ts_dev, REG_IRQENABLE);
 		titsc_writel(ts_dev, REG_IRQENABLE,
@@ -359,9 +360,10 @@ static int titsc_suspend(struct device *dev)
 
 static int titsc_resume(struct device *dev)
 {
-	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
-	struct titsc *ts_dev = tscadc_dev->tsc;
+	struct titsc *ts_dev = dev_get_drvdata(dev);
+	struct ti_tscadc_dev *tscadc_dev;
 
+	tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
 	if (device_may_wakeup(tscadc_dev->dev)) {
 		titsc_writel(ts_dev, REG_IRQWAKEUP,
 				0x00);
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e9f3fb5..772ea2a 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -176,14 +176,14 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	/* TSC Cell */
 	cell = &tscadc->cells[TSC_CELL];
 	cell->name = "tsc";
-	cell->platform_data = tscadc;
-	cell->pdata_size = sizeof(*tscadc);
+	cell->platform_data = &tscadc;
+	cell->pdata_size = sizeof(tscadc);
 
 	/* ADC Cell */
 	cell = &tscadc->cells[ADC_CELL];
 	cell->name = "tiadc";
-	cell->platform_data = tscadc;
-	cell->pdata_size = sizeof(*tscadc);
+	cell->platform_data = &tscadc;
+	cell->pdata_size = sizeof(tscadc);
 
 	err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
 			TSCADC_CELLS, NULL, 0, NULL);
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index c79ad5d..8114e4e 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -149,4 +149,11 @@ struct ti_tscadc_dev {
 	struct adc_device *adc;
 };
 
+static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
+{
+	struct ti_tscadc_dev **tscadc_dev = p->dev.platform_data;
+
+	return *tscadc_dev;
+}
+
 #endif
-- 
1.7.10.4

[PATCH 02/21] input: ti_am33x_tsc: Step enable bits made configurable

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

Current code has hard coded value written to
step enable bits. Now the bits are updated based
on how many steps are needed to be configured got
from platform data.

The user needs to take care not to exceed
the count more than 16. While using ADC and TSC
one should take care to set this parameter correctly.

Sebastian added the common lock and moved the code, that manipulates the
steps, from into the mfd module.

Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c           |   20 ++++++++++++++++++--
 drivers/input/touchscreen/ti_am335x_tsc.c |   12 ++++++++++--
 drivers/mfd/ti_am335x_tscadc.c            |   29 ++++++++++++++++++++++++++++-
 include/linux/mfd/ti_am335x_tscadc.h      |    8 ++++++--
 4 files changed, 62 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 9db352e..543b9c4 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -42,10 +42,20 @@ static void tiadc_writel(struct tiadc_device *adc, unsigned int reg,
 	writel(val, adc->mfd_tscadc->tscadc_base + reg);
 }
 
+static u32 get_adc_step_mask(struct tiadc_device *adc_dev)
+{
+	u32 step_en;
+
+	step_en = ((1 << adc_dev->channels) - 1);
+	step_en <<= TOTAL_STEPS - adc_dev->channels + 1;
+	return step_en;
+}
+
 static void tiadc_step_config(struct tiadc_device *adc_dev)
 {
 	unsigned int stepconfig;
 	int i, channels = 0, steps;
+	u32 step_en;
 
 	/*
 	 * There are 16 configurable steps and 8 analog input
@@ -69,7 +79,8 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
 				STEPCONFIG_OPENDLY);
 		channels++;
 	}
-	tiadc_writel(adc_dev, REG_SE, STPENB_STEPENB);
+	step_en = get_adc_step_mask(adc_dev);
+	am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
 }
 
 static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
@@ -127,7 +138,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
 		if (i == chan->channel)
 			*val = readx1 & 0xfff;
 	}
-	tiadc_writel(adc_dev, REG_SE, STPENB_STEPENB);
+	am335x_tsc_se_update(adc_dev->mfd_tscadc);
 
 	return IIO_VAL_INT;
 }
@@ -191,10 +202,15 @@ static int tiadc_probe(struct platform_device *pdev)
 static int tiadc_remove(struct platform_device *pdev)
 {
 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct tiadc_device *adc_dev = iio_priv(indio_dev);
+	u32 step_en;
 
 	iio_device_unregister(indio_dev);
 	tiadc_channels_remove(indio_dev);
 
+	step_en = get_adc_step_mask(adc_dev);
+	am335x_tsc_se_clr(adc_dev->mfd_tscadc, step_en);
+
 	iio_device_free(indio_dev);
 
 	return 0;
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 16077d3..23d6a4d 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -57,6 +57,7 @@ static void titsc_writel(struct titsc *tsc, unsigned int reg,
 static void titsc_step_config(struct titsc *ts_dev)
 {
 	unsigned int	config;
+	unsigned int	stepenable = 0;
 	int i, total_steps;
 
 	/* Configure the Step registers */
@@ -128,7 +129,9 @@ static void titsc_step_config(struct titsc *ts_dev)
 	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
 			STEPCONFIG_OPENDLY);
 
-	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB_TC);
+	/* The steps1 … end and bit 0 for TS_Charge */
+	stepenable = (1 << (total_steps + 2)) - 1;
+	am335x_tsc_se_set(ts_dev->mfd_tscadc, stepenable);
 }
 
 static void titsc_read_coordinates(struct titsc *ts_dev,
@@ -250,7 +253,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 
 	titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
 
-	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB_TC);
+	am335x_tsc_se_update(ts_dev->mfd_tscadc);
 	return IRQ_HANDLED;
 }
 
@@ -334,6 +337,11 @@ static int titsc_remove(struct platform_device *pdev)
 
 	free_irq(ts_dev->irq, ts_dev);
 
+	/* total steps followed by the enable mask */
+	steps = 2 * ts_dev->steps_to_configure + 2;
+	steps = (1 << steps) - 1;
+	am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps);
+
 	input_unregister_device(ts_dev->input);
 
 	platform_set_drvdata(pdev, NULL);
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 772ea2a..90ccfc0 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -48,6 +48,32 @@ static const struct regmap_config tscadc_regmap_config = {
 	.val_bits = 32,
 };
 
+void am335x_tsc_se_update(struct ti_tscadc_dev *tsadc)
+{
+	tscadc_writel(tsadc, REG_SE, tsadc->reg_se_cache);
+}
+EXPORT_SYMBOL_GPL(am335x_tsc_se_update);
+
+void am335x_tsc_se_set(struct ti_tscadc_dev *tsadc, u32 val)
+{
+	spin_lock(&tsadc->reg_lock);
+	tsadc->reg_se_cache |= val;
+	spin_unlock(&tsadc->reg_lock);
+
+	am335x_tsc_se_update(tsadc);
+}
+EXPORT_SYMBOL_GPL(am335x_tsc_se_set);
+
+void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val)
+{
+	spin_lock(&tsadc->reg_lock);
+	tsadc->reg_se_cache &= ~val;
+	spin_unlock(&tsadc->reg_lock);
+
+	am335x_tsc_se_update(tsadc);
+}
+EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);
+
 static void tscadc_idle_config(struct ti_tscadc_dev *config)
 {
 	unsigned int idleconfig;
@@ -129,6 +155,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 		goto ret;
 	}
 
+	spin_lock_init(&tscadc->reg_lock);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);
 
@@ -239,7 +266,7 @@ static int tscadc_resume(struct device *dev)
 			CNTRLREG_STEPID | CNTRLREG_4WIRE;
 	tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
 	tscadc_idle_config(tscadc_dev);
-	tscadc_writel(tscadc_dev, REG_SE, STPENB_STEPENB);
+	am335x_tsc_se_update(tscadc_dev);
 	restore = tscadc_readl(tscadc_dev, REG_CTRL);
 	tscadc_writel(tscadc_dev, REG_CTRL,
 			(restore | CNTRLREG_TSCSSENB));
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index 8114e4e..4258627 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -46,8 +46,6 @@
 /* Step Enable */
 #define STEPENB_MASK		(0x1FFFF << 0)
 #define STEPENB(val)		((val) << 0)
-#define STPENB_STEPENB		STEPENB(0x1FFFF)
-#define STPENB_STEPENB_TC	STEPENB(0x1FFF)
 
 /* IRQ enable */
 #define IRQENB_HW_PEN		BIT(0)
@@ -141,6 +139,8 @@ struct ti_tscadc_dev {
 	void __iomem *tscadc_base;
 	int irq;
 	struct mfd_cell cells[TSCADC_CELLS];
+	u32 reg_se_cache;
+	spinlock_t reg_lock;
 
 	/* tsc device */
 	struct titsc *tsc;
@@ -156,4 +156,8 @@ static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
 	return *tscadc_dev;
 }
 
+void am335x_tsc_se_update(struct ti_tscadc_dev *tsadc);
+void am335x_tsc_se_set(struct ti_tscadc_dev *tsadc, u32 val);
+void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val);
+
 #endif
-- 
1.7.10.4

[PATCH 03/21] input: ti_am33x_tsc: Order of TSC wires, made configurable

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

The current driver expected touchscreen input
wires(XP,XN,YP,YN) to be connected in a particular order.
Making changes to accept this as platform data.

Sebastian reworked the original patch and removed a lot of the not
required pieces.

Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |  102 ++++++++++++++++++++++++-----
 include/linux/input/ti_am335x_tsc.h       |   12 ++++
 include/linux/mfd/ti_am335x_tscadc.h      |    3 -
 3 files changed, 98 insertions(+), 19 deletions(-)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 23d6a4d..2bdd66c 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -33,6 +33,13 @@
 #define SEQ_SETTLE		275
 #define MAX_12BIT		((1 << 12) - 1)
 
+static const int config_pins[] = {
+	STEPCONFIG_XPP,
+	STEPCONFIG_XNN,
+	STEPCONFIG_YPP,
+	STEPCONFIG_YNN,
+};
+
 struct titsc {
 	struct input_dev	*input;
 	struct ti_tscadc_dev	*mfd_tscadc;
@@ -41,6 +48,9 @@ struct titsc {
 	unsigned int		x_plate_resistance;
 	bool			pen_down;
 	int			steps_to_configure;
+	u32			config_inp[4];
+	u32			bit_xp, bit_xn, bit_yp, bit_yn;
+	u32			inp_xp, inp_xn, inp_yp, inp_yn;
 };
 
 static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
@@ -54,6 +64,58 @@ static void titsc_writel(struct titsc *tsc, unsigned int reg,
 	writel(val, tsc->mfd_tscadc->tscadc_base + reg);
 }
 
+static int titsc_config_wires(struct titsc *ts_dev)
+{
+	u32 analog_line[4];
+	u32 wire_order[4];
+	int i, bit_cfg;
+
+	for (i = 0; i < 4; i++) {
+		/*
+		 * Get the order in which TSC wires are attached
+		 * w.r.t. each of the analog input lines on the EVM.
+		 */
+		analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4;
+		wire_order[i] = ts_dev->config_inp[i] & 0x0F;
+		if (WARN_ON(analog_line[i] > 7))
+			return -EINVAL;
+		if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins)))
+			return -EINVAL;
+	}
+
+	for (i = 0; i < 4; i++) {
+		int an_line;
+		int wi_order;
+
+		an_line = analog_line[i];
+		wi_order = wire_order[i];
+		bit_cfg = config_pins[wi_order];
+		if (bit_cfg == 0)
+			return -EINVAL;
+		switch (wi_order) {
+		case 0:
+			ts_dev->bit_xp = bit_cfg;
+			ts_dev->inp_xp = an_line;
+			break;
+
+		case 1:
+			ts_dev->bit_xn = bit_cfg;
+			ts_dev->inp_xn = an_line;
+			break;
+
+		case 2:
+			ts_dev->bit_yp = bit_cfg;
+			ts_dev->inp_yp = an_line;
+			break;
+		case 3:
+			ts_dev->bit_yn = bit_cfg;
+			ts_dev->inp_yn = an_line;
+			break;
+		}
+	}
+	return 0;
+}
+
 static void titsc_step_config(struct titsc *ts_dev)
 {
 	unsigned int	config;
@@ -64,18 +126,18 @@ static void titsc_step_config(struct titsc *ts_dev)
 	total_steps = 2 * ts_dev->steps_to_configure;
 
 	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | STEPCONFIG_XPP;
+			STEPCONFIG_AVG_16 | ts_dev->bit_xp;
 	switch (ts_dev->wires) {
 	case 4:
-		config |= STEPCONFIG_INP_AN2 | STEPCONFIG_XNN;
+		config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
 		break;
 	case 5:
-		config |= STEPCONFIG_YNN |
-				STEPCONFIG_INP_AN4 | STEPCONFIG_XNN |
-				STEPCONFIG_YPP;
+		config |= ts_dev->bit_yn |
+				STEPCONFIG_INP_AN4 | ts_dev->bit_xn |
+				ts_dev->bit_yp;
 		break;
 	case 8:
-		config |= STEPCONFIG_INP_AN2 | STEPCONFIG_XNN;
+		config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
 		break;
 	}
 
@@ -86,18 +148,18 @@ static void titsc_step_config(struct titsc *ts_dev)
 
 	config = 0;
 	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | STEPCONFIG_YNN |
+			STEPCONFIG_AVG_16 | ts_dev->bit_yn |
 			STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1;
 	switch (ts_dev->wires) {
 	case 4:
-		config |= STEPCONFIG_YPP;
+		config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
 		break;
 	case 5:
-		config |= STEPCONFIG_XPP | STEPCONFIG_INP_AN4 |
-				STEPCONFIG_XNP | STEPCONFIG_YPN;
+		config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 |
+				ts_dev->bit_xn | ts_dev->bit_yp;
 		break;
 	case 8:
-		config |= STEPCONFIG_YPP;
+		config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
 		break;
 	}
 
@@ -108,9 +170,9 @@ static void titsc_step_config(struct titsc *ts_dev)
 
 	config = 0;
 	/* Charge step configuration */
-	config = STEPCONFIG_XPP | STEPCONFIG_YNN |
+	config = ts_dev->bit_xp | ts_dev->bit_yn |
 			STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR |
-			STEPCHARGE_INM_AN1 | STEPCHARGE_INP_AN1;
+			STEPCHARGE_INM_AN1 | STEPCHARGE_INP(ts_dev->inp_yp);
 
 	titsc_writel(ts_dev, REG_CHARGECONFIG, config);
 	titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
@@ -118,13 +180,14 @@ static void titsc_step_config(struct titsc *ts_dev)
 	config = 0;
 	/* Configure to calculate pressure */
 	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | STEPCONFIG_YPP |
-			STEPCONFIG_XNN | STEPCONFIG_INM_ADCREFM;
+			STEPCONFIG_AVG_16 | ts_dev->bit_yp |
+			ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
+			STEPCONFIG_INP(ts_dev->inp_xp);
 	titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config);
 	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 1),
 			STEPCONFIG_OPENDLY);
 
-	config |= STEPCONFIG_INP_AN3 | STEPCONFIG_FIFO1;
+	config |= STEPCONFIG_INP(ts_dev->inp_yn) | STEPCONFIG_FIFO1;
 	titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config);
 	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
 			STEPCONFIG_OPENDLY);
@@ -292,6 +355,8 @@ static int titsc_probe(struct platform_device *pdev)
 	ts_dev->wires = pdata->tsc_init->wires;
 	ts_dev->x_plate_resistance = pdata->tsc_init->x_plate_resistance;
 	ts_dev->steps_to_configure = pdata->tsc_init->steps_to_configure;
+	memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
+			sizeof(pdata->tsc_init->wire_config));
 
 	err = request_irq(ts_dev->irq, titsc_irq,
 			  0, pdev->dev.driver->name, ts_dev);
@@ -301,6 +366,11 @@ static int titsc_probe(struct platform_device *pdev)
 	}
 
 	titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
+	err = titsc_config_wires(ts_dev);
+	if (err) {
+		dev_err(&pdev->dev, "wrong i/p wire configuration\n");
+		goto err_free_irq;
+	}
 	titsc_step_config(ts_dev);
 	titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->steps_to_configure);
 
diff --git a/include/linux/input/ti_am335x_tsc.h b/include/linux/input/ti_am335x_tsc.h
index 49269a2..6a66b4d 100644
--- a/include/linux/input/ti_am335x_tsc.h
+++ b/include/linux/input/ti_am335x_tsc.h
@@ -12,12 +12,24 @@
  *			A step configured to read a single
  *			co-ordinate value, can be applied
  *			more number of times for better results.
+ * @wire_config:	Different EVM's could have a different order
+ *			for connecting wires on touchscreen.
+ *			We need to provide an 8 bit number where in
+ *			the 1st four bits represent the analog lines
+ *			and the next 4 bits represent positive/
+ *			negative terminal on that input line.
+ *			Notations to represent the input lines and
+ *			terminals resoectively is as follows:
+ *			AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
+ *			XP  = 0, XN = 1, YP = 2, YN = 3.
+ *
  */
 
 struct tsc_data {
 	int wires;
 	int x_plate_resistance;
 	int steps_to_configure;
+	int wire_config[10];
 };
 
 #endif
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index 4258627..e36ae41 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -71,8 +71,6 @@
 #define STEPCONFIG_INM_ADCREFM	STEPCONFIG_INM(8)
 #define STEPCONFIG_INP_MASK	(0xF << 19)
 #define STEPCONFIG_INP(val)	((val) << 19)
-#define STEPCONFIG_INP_AN2	STEPCONFIG_INP(2)
-#define STEPCONFIG_INP_AN3	STEPCONFIG_INP(3)
 #define STEPCONFIG_INP_AN4	STEPCONFIG_INP(4)
 #define STEPCONFIG_INP_ADCREFM	STEPCONFIG_INP(8)
 #define STEPCONFIG_FIFO1	BIT(26)
@@ -94,7 +92,6 @@
 #define STEPCHARGE_INM_AN1	STEPCHARGE_INM(1)
 #define STEPCHARGE_INP_MASK	(0xF << 19)
 #define STEPCHARGE_INP(val)	((val) << 19)
-#define STEPCHARGE_INP_AN1	STEPCHARGE_INP(1)
 #define STEPCHARGE_RFM_MASK	(3 << 23)
 #define STEPCHARGE_RFM(val)	((val) << 23)
 #define STEPCHARGE_RFM_XNUR	STEPCHARGE_RFM(1)
-- 
1.7.10.4

[PATCH 04/21] input: ti_am33x_tsc: remove unwanted fifo flush

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

When touchscreen and ADC are used together, this
unwanted fifo flush leads to loss of ADC data.

Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |   10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 2bdd66c..7b7de60 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -252,8 +252,6 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 	unsigned int x = 0, y = 0;
 	unsigned int z1, z2, z;
 	unsigned int fsm;
-	unsigned int fifo1count, fifo0count;
-	int i;
 
 	status = titsc_readl(ts_dev, REG_IRQSTATUS);
 	if (status & IRQENB_FIFO0THRES) {
@@ -262,14 +260,6 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 		z1 = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
 		z2 = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
 
-		fifo1count = titsc_readl(ts_dev, REG_FIFO1CNT);
-		for (i = 0; i < fifo1count; i++)
-			titsc_readl(ts_dev, REG_FIFO1);
-
-		fifo0count = titsc_readl(ts_dev, REG_FIFO0CNT);
-		for (i = 0; i < fifo0count; i++)
-			titsc_readl(ts_dev, REG_FIFO0);
-
 		if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
 			/*
 			 * Calculate pressure using formula
-- 
1.7.10.4

[PATCH 05/21] input: ti_am33x_tsc: Add DT support

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

This patch adds DT support to touch driver. It also provides a binding
document which is used by the MFD and IIO part of the device.
This patch also renames steps_to_configure to coordinate_readouts
because the original name misleads the purpose of the variable.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 .../bindings/input/touchscreen/ti-tsc-adc.txt      |   44 ++++++++
 drivers/input/touchscreen/ti_am335x_tsc.c          |  105 +++++++++++++++-----
 drivers/mfd/ti_am335x_tscadc.c                     |    1 +
 3 files changed, 127 insertions(+), 23 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt

diff --git a/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt b/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
new file mode 100644
index 0000000..491c97b
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
@@ -0,0 +1,44 @@
+* TI - TSC ADC (Touschscreen and analog digital converter)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Required properties:
+- child "tsc"
+	ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen
+		  support on the platform.
+	ti,x-plate-resistance: X plate resistance
+	ti,coordiante-readouts: The sequencer supports a total of 16
+				programmable steps each step is used to
+				read a single coordinate. A single
+                                readout is enough but multiple reads can
+				increase the quality.
+				A value of 5 means, 5 reads for X, 5 for
+				Y and 2 for Z (always). This utilises 12
+				of the 16 software steps available. The
+				remaining 4 can be used by the ADC.
+	ti,wire-config: Different boards could have a different order for
+			connecting wires on touchscreen. We need to provide an
+			8 bit number where in the 1st four bits represent the
+			analog lines and the next 4 bits represent positive/
+			negative terminal on that input line. Notations to
+			represent the input lines and terminals resoectively
+			is as follows:
+			AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
+			XP  = 0, XN = 1, YP = 2, YN = 3.
+- child "adc"
+	ti,adc-channels: List of analog inputs available for ADC.
+			 AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
+
+Example:
+	tscadc: tscadc@44e0d000 {
+		compatible = "ti,am3359-tscadc";
+		tsc {
+			ti,wires = <4>;
+			ti,x-plate-resistance = <200>;
+			ti,coordiante-readouts = <5>;
+			ti,wire-config = <0x00 0x11 0x22 0x33>;
+		};
+
+		adc {
+			ti,adc-channels = <4 5 6 7>;
+		};
+	}
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 7b7de60..449c0fb 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -26,6 +26,8 @@
 #include <linux/io.h>
 #include <linux/input/ti_am335x_tsc.h>
 #include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
 
@@ -47,7 +49,7 @@ struct titsc {
 	unsigned int		wires;
 	unsigned int		x_plate_resistance;
 	bool			pen_down;
-	int			steps_to_configure;
+	int			coordinate_readouts;
 	u32			config_inp[4];
 	u32			bit_xp, bit_xn, bit_yp, bit_yn;
 	u32			inp_xp, inp_xn, inp_yp, inp_yn;
@@ -123,7 +125,7 @@ static void titsc_step_config(struct titsc *ts_dev)
 	int i, total_steps;
 
 	/* Configure the Step registers */
-	total_steps = 2 * ts_dev->steps_to_configure;
+	total_steps = 2 * ts_dev->coordinate_readouts;
 
 	config = STEPCONFIG_MODE_HWSYNC |
 			STEPCONFIG_AVG_16 | ts_dev->bit_xp;
@@ -141,7 +143,7 @@ static void titsc_step_config(struct titsc *ts_dev)
 		break;
 	}
 
-	for (i = 1; i <= ts_dev->steps_to_configure; i++) {
+	for (i = 1; i <= ts_dev->coordinate_readouts; i++) {
 		titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
 		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
 	}
@@ -163,7 +165,7 @@ static void titsc_step_config(struct titsc *ts_dev)
 		break;
 	}
 
-	for (i = (ts_dev->steps_to_configure + 1); i <= total_steps; i++) {
+	for (i = (ts_dev->coordinate_readouts + 1); i <= total_steps; i++) {
 		titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
 		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
 	}
@@ -218,7 +220,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
 		read = titsc_readl(ts_dev, REG_FIFO0);
 		channel = read & 0xf0000;
 		channel = channel >> 0x10;
-		if ((channel >= 0) && (channel < ts_dev->steps_to_configure)) {
+		if ((channel >= 0) && (channel < ts_dev->coordinate_readouts)) {
 			read &= 0xfff;
 			diff = abs(read - prev_val_x);
 			if (diff < prev_diff_x) {
@@ -231,8 +233,8 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
 		read = titsc_readl(ts_dev, REG_FIFO1);
 		channel = read & 0xf0000;
 		channel = channel >> 0x10;
-		if ((channel >= ts_dev->steps_to_configure) &&
-			(channel < (2 * ts_dev->steps_to_configure - 1))) {
+		if ((channel >= ts_dev->coordinate_readouts) &&
+			(channel < (2 * ts_dev->coordinate_readouts - 1))) {
 			read &= 0xfff;
 			diff = abs(read - prev_val_y);
 			if (diff < prev_diff_y) {
@@ -310,6 +312,59 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
+static int titsc_parse_dt(struct platform_device *pdev,
+					struct titsc *ts_dev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	int err;
+
+	if (!node)
+		return -EINVAL;
+
+	err = of_property_read_u32(node, "ti,wires", &ts_dev->wires);
+	if (err < 0)
+		return err;
+	switch (ts_dev->wires) {
+	case 4:
+	case 5:
+	case 8:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	err = of_property_read_u32(node, "ti,x-plate-resistance",
+			&ts_dev->x_plate_resistance);
+	if (err < 0)
+		return err;
+
+	err = of_property_read_u32(node, "ti,coordiante-readouts",
+			&ts_dev->coordinate_readouts);
+	if (err < 0)
+		return err;
+
+	return of_property_read_u32_array(node, "ti,wire-config",
+			ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
+}
+
+static int titsc_parse_pdata(struct ti_tscadc_dev *tscadc_dev,
+					struct titsc *ts_dev)
+{
+	struct mfd_tscadc_board	*pdata = tscadc_dev->dev->platform_data;
+
+	if (!pdata)
+		return -EINVAL;
+
+	ts_dev->wires = pdata->tsc_init->wires;
+	ts_dev->x_plate_resistance =
+		pdata->tsc_init->x_plate_resistance;
+	ts_dev->steps_to_configure =
+		pdata->tsc_init->steps_to_configure;
+	memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
+		sizeof(pdata->tsc_init->wire_config));
+	return 0;
+}
+
 /*
  * The functions for inserting/removing driver as a module.
  */
@@ -319,16 +374,8 @@ static int titsc_probe(struct platform_device *pdev)
 	struct titsc *ts_dev;
 	struct input_dev *input_dev;
 	struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
-	struct mfd_tscadc_board	*pdata;
 	int err;
 
-	pdata = tscadc_dev->dev->platform_data;
-
-	if (!pdata) {
-		dev_err(&pdev->dev, "Could not find platform data\n");
-		return -EINVAL;
-	}
-
 	/* Allocate memory for device */
 	ts_dev = kzalloc(sizeof(struct titsc), GFP_KERNEL);
 	input_dev = input_allocate_device();
@@ -342,11 +389,16 @@ static int titsc_probe(struct platform_device *pdev)
 	ts_dev->mfd_tscadc = tscadc_dev;
 	ts_dev->input = input_dev;
 	ts_dev->irq = tscadc_dev->irq;
-	ts_dev->wires = pdata->tsc_init->wires;
-	ts_dev->x_plate_resistance = pdata->tsc_init->x_plate_resistance;
-	ts_dev->steps_to_configure = pdata->tsc_init->steps_to_configure;
-	memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
-			sizeof(pdata->tsc_init->wire_config));
+
+	if (tscadc_dev->dev->platform_data)
+		err = titsc_parse_pdata(tscadc_dev, ts_dev);
+	else
+		err = titsc_parse_dt(pdev, ts_dev);
+
+	if (err) {
+		dev_err(&pdev->dev, "Could not find valid DT data.\n");
+		goto err_free_mem;
+	}
 
 	err = request_irq(ts_dev->irq, titsc_irq,
 			  0, pdev->dev.driver->name, ts_dev);
@@ -362,7 +414,7 @@ static int titsc_probe(struct platform_device *pdev)
 		goto err_free_irq;
 	}
 	titsc_step_config(ts_dev);
-	titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->steps_to_configure);
+	titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->coordinate_readouts);
 
 	input_dev->name = "ti-tsc";
 	input_dev->dev.parent = &pdev->dev;
@@ -398,7 +450,7 @@ static int titsc_remove(struct platform_device *pdev)
 	free_irq(ts_dev->irq, ts_dev);
 
 	/* total steps followed by the enable mask */
-	steps = 2 * ts_dev->steps_to_configure + 2;
+	steps = 2 * ts_dev->coordinate_readouts + 2;
 	steps = (1 << steps) - 1;
 	am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps);
 
@@ -439,7 +491,7 @@ static int titsc_resume(struct device *dev)
 	}
 	titsc_step_config(ts_dev);
 	titsc_writel(ts_dev, REG_FIFO0THR,
-			ts_dev->steps_to_configure);
+			ts_dev->coordinate_readouts);
 	return 0;
 }
 
@@ -452,6 +504,12 @@ static const struct dev_pm_ops titsc_pm_ops = {
 #define TITSC_PM_OPS NULL
 #endif
 
+static const struct of_device_id ti_tsc_dt_ids[] = {
+	{ .compatible = "ti,am3359-tsc", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids);
+
 static struct platform_driver ti_tsc_driver = {
 	.probe	= titsc_probe,
 	.remove	= titsc_remove,
@@ -459,6 +517,7 @@ static struct platform_driver ti_tsc_driver = {
 		.name   = "tsc",
 		.owner	= THIS_MODULE,
 		.pm	= TITSC_PM_OPS,
+		.of_match_table = of_match_ptr(ti_tsc_dt_ids),
 	},
 };
 module_platform_driver(ti_tsc_driver);
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 90ccfc0..f509766 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -203,6 +203,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	/* TSC Cell */
 	cell = &tscadc->cells[TSC_CELL];
 	cell->name = "tsc";
+	cell->of_compatible = "ti,am3359-tsc";
 	cell->platform_data = &tscadc;
 	cell->pdata_size = sizeof(tscadc);
 
-- 
1.7.10.4

[PATCH 06/21] input: ti_am33x_tsc: remove platform_data support

[Sebastian Andrzej Siewior]

This patch removes access to platform data mfd_tscadc_board because the
platform is DT only.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |   25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 449c0fb..a1db55d 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -24,7 +24,6 @@
 #include <linux/clk.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
-#include <linux/input/ti_am335x_tsc.h>
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -347,24 +346,6 @@ static int titsc_parse_dt(struct platform_device *pdev,
 			ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
 }
 
-static int titsc_parse_pdata(struct ti_tscadc_dev *tscadc_dev,
-					struct titsc *ts_dev)
-{
-	struct mfd_tscadc_board	*pdata = tscadc_dev->dev->platform_data;
-
-	if (!pdata)
-		return -EINVAL;
-
-	ts_dev->wires = pdata->tsc_init->wires;
-	ts_dev->x_plate_resistance =
-		pdata->tsc_init->x_plate_resistance;
-	ts_dev->steps_to_configure =
-		pdata->tsc_init->steps_to_configure;
-	memcpy(ts_dev->config_inp, pdata->tsc_init->wire_config,
-		sizeof(pdata->tsc_init->wire_config));
-	return 0;
-}
-
 /*
  * The functions for inserting/removing driver as a module.
  */
@@ -390,11 +371,7 @@ static int titsc_probe(struct platform_device *pdev)
 	ts_dev->input = input_dev;
 	ts_dev->irq = tscadc_dev->irq;
 
-	if (tscadc_dev->dev->platform_data)
-		err = titsc_parse_pdata(tscadc_dev, ts_dev);
-	else
-		err = titsc_parse_dt(pdev, ts_dev);
-
+	err = titsc_parse_dt(pdev, ts_dev);
 	if (err) {
 		dev_err(&pdev->dev, "Could not find valid DT data.\n");
 		goto err_free_mem;
-- 
1.7.10.4

[PATCH 07/21] iio: ti_am335x_adc: Add DT support

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

Add DT support for client ADC driver.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c |   29 ++++++++++++++++++++++++-----
 drivers/mfd/ti_am335x_tscadc.c  |    1 +
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 543b9c4..b24402c 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -22,6 +22,8 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/iio/iio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
 #include <linux/platform_data/ti_am335x_adc.h>
@@ -152,11 +154,12 @@ static int tiadc_probe(struct platform_device *pdev)
 	struct iio_dev		*indio_dev;
 	struct tiadc_device	*adc_dev;
 	struct ti_tscadc_dev	*tscadc_dev = ti_tscadc_dev_get(pdev);
-	struct mfd_tscadc_board	*pdata;
+	struct mfd_tscadc_board	*pdata = tscadc_dev->dev->platform_data;
+	struct device_node	*node = pdev->dev.of_node;
 	int			err;
+	u32			val32;
 
-	pdata = tscadc_dev->dev->platform_data;
-	if (!pdata || !pdata->adc_init) {
+	if (!pdata && !node) {
 		dev_err(&pdev->dev, "Could not find platform data\n");
 		return -EINVAL;
 	}
@@ -169,8 +172,17 @@ static int tiadc_probe(struct platform_device *pdev)
 	}
 	adc_dev = iio_priv(indio_dev);
 
-	adc_dev->mfd_tscadc = tscadc_dev;
-	adc_dev->channels = pdata->adc_init->adc_channels;
+	adc_dev->mfd_tscadc = ti_tscadc_dev_get(pdev);
+
+	if (pdata)
+		adc_dev->channels = pdata->adc_init->adc_channels;
+	else {
+		err = of_property_read_u32(node,
+				"ti,adc-channels", &val32);
+		if (err < 0)
+			goto err_free_device;
+		adc_dev->channels = val32;
+	}
 
 	indio_dev->dev.parent = &pdev->dev;
 	indio_dev->name = dev_name(&pdev->dev);
@@ -260,11 +272,18 @@ static const struct dev_pm_ops tiadc_pm_ops = {
 #define TIADC_PM_OPS NULL
 #endif
 
+static const struct of_device_id ti_adc_dt_ids[] = {
+	{ .compatible = "ti,am3359-adc", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ti_adc_dt_ids);
+
 static struct platform_driver tiadc_driver = {
 	.driver = {
 		.name   = "tiadc",
 		.owner	= THIS_MODULE,
 		.pm	= TIADC_PM_OPS,
+		.of_match_table = of_match_ptr(ti_adc_dt_ids),
 	},
 	.probe	= tiadc_probe,
 	.remove	= tiadc_remove,
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index f509766..1d6c740 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -210,6 +210,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	/* ADC Cell */
 	cell = &tscadc->cells[ADC_CELL];
 	cell->name = "tiadc";
+	cell->of_compatible = "ti,am3359-adc";
 	cell->platform_data = &tscadc;
 	cell->pdata_size = sizeof(tscadc);
 
-- 
1.7.10.4

[PATCH 08/21] iio: ti_am335x_adc: remove platform_data support

[Sebastian Andrzej Siewior]

This patch removes access to platform data mfd_tscadc_board because the
platform is DT only.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c |   21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index b24402c..2868c0c 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -26,7 +26,6 @@
 #include <linux/of_device.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
-#include <linux/platform_data/ti_am335x_adc.h>
 
 struct tiadc_device {
 	struct ti_tscadc_dev *mfd_tscadc;
@@ -153,14 +152,12 @@ static int tiadc_probe(struct platform_device *pdev)
 {
 	struct iio_dev		*indio_dev;
 	struct tiadc_device	*adc_dev;
-	struct ti_tscadc_dev	*tscadc_dev = ti_tscadc_dev_get(pdev);
-	struct mfd_tscadc_board	*pdata = tscadc_dev->dev->platform_data;
 	struct device_node	*node = pdev->dev.of_node;
 	int			err;
 	u32			val32;
 
-	if (!pdata && !node) {
-		dev_err(&pdev->dev, "Could not find platform data\n");
+	if (!node) {
+		dev_err(&pdev->dev, "Could not find valid DT data.\n");
 		return -EINVAL;
 	}
 
@@ -174,15 +171,11 @@ static int tiadc_probe(struct platform_device *pdev)
 
 	adc_dev->mfd_tscadc = ti_tscadc_dev_get(pdev);
 
-	if (pdata)
-		adc_dev->channels = pdata->adc_init->adc_channels;
-	else {
-		err = of_property_read_u32(node,
-				"ti,adc-channels", &val32);
-		if (err < 0)
-			goto err_free_device;
-		adc_dev->channels = val32;
-	}
+	err = of_property_read_u32(node,
+			"ti,adc-channels", &val32);
+	if (err < 0)
+		goto err_free_device;
+	adc_dev->channels = val32;
 
 	indio_dev->dev.parent = &pdev->dev;
 	indio_dev->name = dev_name(&pdev->dev);
-- 
1.7.10.4

[PATCH 09/21] mfd: ti_am335x_tscadc: Add DT support

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

Add DT support in the MFD core driver. The node name is "am3359" because
it was tested on this platform.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/mfd/ti_am335x_tscadc.c |   32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 1d6c740..292d34e 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -22,6 +22,8 @@
 #include <linux/regmap.h>
 #include <linux/mfd/core.h>
 #include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
 #include <linux/input/ti_am335x_tsc.h>
@@ -90,20 +92,31 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	struct resource		*res;
 	struct clk		*clk;
 	struct mfd_tscadc_board	*pdata = pdev->dev.platform_data;
+	struct device_node	*node = pdev->dev.of_node;
 	struct mfd_cell		*cell;
 	int			err, ctrl;
 	int			clk_value, clock_rate;
-	int			tsc_wires, adc_channels = 0, total_channels;
+	int			tsc_wires = 0, adc_channels = 0, total_channels;
 
-	if (!pdata) {
+	if (!pdata && !pdev->dev.of_node) {
 		dev_err(&pdev->dev, "Could not find platform data\n");
 		return -EINVAL;
 	}
 
-	if (pdata->adc_init)
-		adc_channels = pdata->adc_init->adc_channels;
+	if (pdev->dev.platform_data) {
+		if (pdata->tsc_init)
+			tsc_wires = pdata->tsc_init->wires;
+
+		if (pdata->adc_init)
+			adc_channels = pdata->adc_init->adc_channels;
+	} else {
+		node = of_get_child_by_name(pdev->dev.of_node, "tsc");
+		of_property_read_u32(node, "ti,wires", &tsc_wires);
+
+		node = of_get_child_by_name(pdev->dev.of_node, "adc");
+		of_property_read_u32(node, "ti,adc-channels", &adc_channels);
+	}
 
-	tsc_wires = pdata->tsc_init->wires;
 	total_channels = tsc_wires + adc_channels;
 
 	if (total_channels > 8) {
@@ -285,11 +298,18 @@ static const struct dev_pm_ops tscadc_pm_ops = {
 #define TSCADC_PM_OPS NULL
 #endif
 
+static const struct of_device_id ti_tscadc_dt_ids[] = {
+	{ .compatible = "ti,am3359-tscadc", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);
+
 static struct platform_driver ti_tscadc_driver = {
 	.driver = {
-		.name   = "ti_tscadc",
+		.name   = "ti_am3359-tscadc",
 		.owner	= THIS_MODULE,
 		.pm	= TSCADC_PM_OPS,
+		.of_match_table = of_match_ptr(ti_tscadc_dt_ids),
 	},
 	.probe	= ti_tscadc_probe,
 	.remove	= ti_tscadc_remove,
-- 
1.7.10.4

[PATCH 10/21] mfd: ti_am335x_tscadc: remove platform_data support

[Sebastian Andrzej Siewior]

This patch removes access to platform data mfd_tscadc_board because the
platform is DT only.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/mfd/ti_am335x_tscadc.c |   23 ++++++-----------------
 1 file changed, 6 insertions(+), 17 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 292d34e..e78b9df 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -26,8 +26,6 @@
 #include <linux/of_device.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
-#include <linux/input/ti_am335x_tsc.h>
-#include <linux/platform_data/ti_am335x_adc.h>
 
 static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg)
 {
@@ -91,31 +89,22 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	struct ti_tscadc_dev	*tscadc;
 	struct resource		*res;
 	struct clk		*clk;
-	struct mfd_tscadc_board	*pdata = pdev->dev.platform_data;
 	struct device_node	*node = pdev->dev.of_node;
 	struct mfd_cell		*cell;
 	int			err, ctrl;
 	int			clk_value, clock_rate;
 	int			tsc_wires = 0, adc_channels = 0, total_channels;
 
-	if (!pdata && !pdev->dev.of_node) {
-		dev_err(&pdev->dev, "Could not find platform data\n");
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev, "Could not find valid DT data.\n");
 		return -EINVAL;
 	}
 
-	if (pdev->dev.platform_data) {
-		if (pdata->tsc_init)
-			tsc_wires = pdata->tsc_init->wires;
+	node = of_get_child_by_name(pdev->dev.of_node, "tsc");
+	of_property_read_u32(node, "ti,wires", &tsc_wires);
 
-		if (pdata->adc_init)
-			adc_channels = pdata->adc_init->adc_channels;
-	} else {
-		node = of_get_child_by_name(pdev->dev.of_node, "tsc");
-		of_property_read_u32(node, "ti,wires", &tsc_wires);
-
-		node = of_get_child_by_name(pdev->dev.of_node, "adc");
-		of_property_read_u32(node, "ti,adc-channels", &adc_channels);
-	}
+	node = of_get_child_by_name(pdev->dev.of_node, "adc");
+	of_property_read_u32(node, "ti,adc-channels", &adc_channels);
 
 	total_channels = tsc_wires + adc_channels;
 
-- 
1.7.10.4

[PATCH 11/21] iio: ti_tscadc: provide datasheet_name and scan_type

[Sebastian Andrzej Siewior]

From: Pantelis Antoniou <panto@antoniou-consulting.com>

This patch provides the members "datasheet_name" and scan_type. This is
the remaining part of the earlier patch where I (bigeasy) removed iio_map
because it is now supplied by the device tree. It also static names as
suggested by Jonathan.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c |   29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 2868c0c..9939810 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -24,6 +24,8 @@
 #include <linux/iio/iio.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/iio/machine.h>
+#include <linux/iio/driver.h>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
 
@@ -84,29 +86,46 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
 	am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
 }
 
+static const char * const chan_name_ain[] = {
+	"AIN0",
+	"AIN1",
+	"AIN2",
+	"AIN3",
+	"AIN4",
+	"AIN5",
+	"AIN6",
+	"AIN7",
+};
+
 static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
 {
+	struct tiadc_device *adc_dev = iio_priv(indio_dev);
 	struct iio_chan_spec *chan_array;
+	struct iio_chan_spec *chan;
 	int i;
 
 	indio_dev->num_channels = channels;
-	chan_array = kcalloc(indio_dev->num_channels,
+	chan_array = kcalloc(channels,
 			sizeof(struct iio_chan_spec), GFP_KERNEL);
-
 	if (chan_array == NULL)
 		return -ENOMEM;
 
-	for (i = 0; i < (indio_dev->num_channels); i++) {
-		struct iio_chan_spec *chan = chan_array + i;
+	chan = chan_array;
+	for (i = 0; i < channels; i++, chan++) {
+
 		chan->type = IIO_VOLTAGE;
 		chan->indexed = 1;
 		chan->channel = i;
 		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
+		chan->datasheet_name = chan_name_ain[i];
+		chan->scan_type.sign = 'u';
+		chan->scan_type.realbits = 12;
+		chan->scan_type.storagebits = 32;
 	}
 
 	indio_dev->channels = chan_array;
 
-	return indio_dev->num_channels;
+	return 0;
 }
 
 static void tiadc_channels_remove(struct iio_dev *indio_dev)
-- 
1.7.10.4

[PATCH 12/21] mfd: ti_tscadc: deal with partial activation

[Sebastian Andrzej Siewior]

From: Pantelis Antoniou <panto@antoniou-consulting.com>

Fix the mfd device in the case where a subdevice might not be activated.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/mfd/ti_am335x_tscadc.c       |   38 ++++++++++++++++++++++------------
 include/linux/mfd/ti_am335x_tscadc.h |    8 +++----
 2 files changed, 28 insertions(+), 18 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e78b9df..d05fcba 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -107,11 +107,14 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	of_property_read_u32(node, "ti,adc-channels", &adc_channels);
 
 	total_channels = tsc_wires + adc_channels;
-
 	if (total_channels > 8) {
 		dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
 		return -EINVAL;
 	}
+	if (total_channels == 0) {
+		dev_err(&pdev->dev, "Need atleast one channel.\n");
+		return -EINVAL;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -202,28 +205,37 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	ctrl |= CNTRLREG_TSCSSENB;
 	tscadc_writel(tscadc, REG_CTRL, ctrl);
 
+	tscadc->used_cells = 0;
+	tscadc->tsc_cell = -1;
+	tscadc->adc_cell = -1;
+
 	/* TSC Cell */
-	cell = &tscadc->cells[TSC_CELL];
-	cell->name = "tsc";
-	cell->of_compatible = "ti,am3359-tsc";
-	cell->platform_data = &tscadc;
-	cell->pdata_size = sizeof(tscadc);
+	if (tsc_wires > 0) {
+		tscadc->tsc_cell = tscadc->used_cells;
+		cell = &tscadc->cells[tscadc->used_cells++];
+		cell->name = "tsc";
+		cell->of_compatible = "ti,am3359-tsc";
+		cell->platform_data = &tscadc;
+		cell->pdata_size = sizeof(tscadc);
+	}
 
 	/* ADC Cell */
-	cell = &tscadc->cells[ADC_CELL];
-	cell->name = "tiadc";
-	cell->of_compatible = "ti,am3359-adc";
-	cell->platform_data = &tscadc;
-	cell->pdata_size = sizeof(tscadc);
+	if (adc_channels > 0) {
+		tscadc->adc_cell = tscadc->used_cells;
+		cell = &tscadc->cells[tscadc->used_cells++];
+		cell->name = "tiadc";
+		cell->of_compatible = "ti,am3359-adc";
+		cell->platform_data = &tscadc;
+		cell->pdata_size = sizeof(tscadc);
+	}
 
 	err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
-			TSCADC_CELLS, NULL, 0, NULL);
+			tscadc->used_cells, NULL, 0, NULL);
 	if (err < 0)
 		goto err_disable_clk;
 
 	device_init_wakeup(&pdev->dev, true);
 	platform_set_drvdata(pdev, tscadc);
-
 	return 0;
 
 err_disable_clk:
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index e36ae41..fe54ba4 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -120,11 +120,6 @@
 
 #define TSCADC_CELLS		2
 
-enum tscadc_cells {
-	TSC_CELL,
-	ADC_CELL,
-};
-
 struct mfd_tscadc_board {
 	struct tsc_data *tsc_init;
 	struct adc_data *adc_init;
@@ -135,6 +130,9 @@ struct ti_tscadc_dev {
 	struct regmap *regmap_tscadc;
 	void __iomem *tscadc_base;
 	int irq;
+	int used_cells;	/* 1-2 */
+	int tsc_cell;	/* -1 if not used */
+	int adc_cell;	/* -1 if not used */
 	struct mfd_cell cells[TSCADC_CELLS];
 	u32 reg_se_cache;
 	spinlock_t reg_lock;
-- 
1.7.10.4

[PATCH 13/21] arm: am33xx: add TSC/ADC mfd device support

[Sebastian Andrzej Siewior]

From: "Patil, Rachna" <rachna@ti.com>

Add support for core multifunctional device along
with its clients touchscreen and ADC.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Patil, Rachna <rachna@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
---
 arch/arm/boot/dts/am335x-evm.dts |   14 ++++++++++++++
 arch/arm/boot/dts/am33xx.dtsi    |   18 ++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 0423298..26fea97 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -244,3 +244,17 @@
 &cpsw_emac1 {
 	phy_id = <&davinci_mdio>, <1>;
 };
+
+&tscadc {
+	status = "okay";
+	tsc {
+		ti,wires = <4>;
+		ti,x-plate-resistance = <200>;
+		ti,coordiante-readouts = <5>;
+		ti,wire-config = <0x00 0x11 0x22 0x33>;
+	};
+
+	adc {
+		ti,adc-channels = <4>;
+	};
+};
diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index 1460d9b..4ad7797 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -404,6 +404,24 @@
 			ti,hwmods = "wkup_m3";
 		};
 
+		tscadc: tscadc@44e0d000 {
+			compatible = "ti,am3359-tscadc";
+			reg = <0x44e0d000 0x1000>;
+			interrupt-parent = <&intc>;
+			interrupts = <16>;
+			ti,hwmods = "adc_tsc";
+			status = "disabled";
+
+			tsc {
+				compatible = "ti,am3359-tsc";
+			};
+			am335x_adc: adc {
+				#io-channel-cells = <1>;
+				compatible = "ti,am3359-adc";
+			};
+
+		};
+
 		gpmc: gpmc@50000000 {
 			compatible = "ti,am3352-gpmc";
 			ti,hwmods = "gpmc";
-- 
1.7.10.4

[PATCH 14/21] input: mfd: ti_am335x_tsc remove remaining platform data pieces

[Sebastian Andrzej Siewior]

The two header files removed here are unused and have no users as this
platform was never used with platform devices.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 include/linux/input/ti_am335x_tsc.h         |   35 ---------------------------
 include/linux/mfd/ti_am335x_tscadc.h        |    5 ----
 include/linux/platform_data/ti_am335x_adc.h |   14 -----------
 3 files changed, 54 deletions(-)
 delete mode 100644 include/linux/input/ti_am335x_tsc.h
 delete mode 100644 include/linux/platform_data/ti_am335x_adc.h

diff --git a/include/linux/input/ti_am335x_tsc.h b/include/linux/input/ti_am335x_tsc.h
deleted file mode 100644
index 6a66b4d..0000000
--- a/include/linux/input/ti_am335x_tsc.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef __LINUX_TI_AM335X_TSC_H
-#define __LINUX_TI_AM335X_TSC_H
-
-/**
- * struct tsc_data	Touchscreen wire configuration
- * @wires:		Wires refer to application modes
- *			i.e. 4/5/8 wire touchscreen support
- *			on the platform.
- * @x_plate_resistance:	X plate resistance.
- * @steps_to_configure:	The sequencer supports a total of
- *			16 programmable steps.
- *			A step configured to read a single
- *			co-ordinate value, can be applied
- *			more number of times for better results.
- * @wire_config:	Different EVM's could have a different order
- *			for connecting wires on touchscreen.
- *			We need to provide an 8 bit number where in
- *			the 1st four bits represent the analog lines
- *			and the next 4 bits represent positive/
- *			negative terminal on that input line.
- *			Notations to represent the input lines and
- *			terminals resoectively is as follows:
- *			AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
- *			XP  = 0, XN = 1, YP = 2, YN = 3.
- *
- */
-
-struct tsc_data {
-	int wires;
-	int x_plate_resistance;
-	int steps_to_configure;
-	int wire_config[10];
-};
-
-#endif
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index fe54ba4..533f200 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -120,11 +120,6 @@
 
 #define TSCADC_CELLS		2
 
-struct mfd_tscadc_board {
-	struct tsc_data *tsc_init;
-	struct adc_data *adc_init;
-};
-
 struct ti_tscadc_dev {
 	struct device *dev;
 	struct regmap *regmap_tscadc;
diff --git a/include/linux/platform_data/ti_am335x_adc.h b/include/linux/platform_data/ti_am335x_adc.h
deleted file mode 100644
index e41d583..0000000
--- a/include/linux/platform_data/ti_am335x_adc.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef __LINUX_TI_AM335X_ADC_H
-#define __LINUX_TI_AM335X_ADC_H
-
-/**
- * struct adc_data	ADC Input information
- * @adc_channels:	Number of analog inputs
- *			available for ADC.
- */
-
-struct adc_data {
-	unsigned int adc_channels;
-};
-
-#endif
-- 
1.7.10.4

[PATCH 15/21] mfd: input: ti_am335x_tsc: rename device from tsc to TI-am335x-tsc

[Sebastian Andrzej Siewior]

tsc is a very generic name. This patch adds a TI and HW prefix to it
less generic.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |    2 +-
 drivers/mfd/ti_am335x_tscadc.c            |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index a1db55d..ff3215d 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -491,7 +491,7 @@ static struct platform_driver ti_tsc_driver = {
 	.probe	= titsc_probe,
 	.remove	= titsc_remove,
 	.driver	= {
-		.name   = "tsc",
+		.name   = "TI-am335x-tsc",
 		.owner	= THIS_MODULE,
 		.pm	= TITSC_PM_OPS,
 		.of_match_table = of_match_ptr(ti_tsc_dt_ids),
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index d05fcba..5fb8b1d 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -213,7 +213,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	if (tsc_wires > 0) {
 		tscadc->tsc_cell = tscadc->used_cells;
 		cell = &tscadc->cells[tscadc->used_cells++];
-		cell->name = "tsc";
+		cell->name = "TI-am335x-tsc";
 		cell->of_compatible = "ti,am3359-tsc";
 		cell->platform_data = &tscadc;
 		cell->pdata_size = sizeof(tscadc);
-- 
1.7.10.4

[PATCH 16/21] mfd: iio: ti_am335x_adc: rename device from tiadc to TI-am335x-adc

[Sebastian Andrzej Siewior]

TI-adc reads a little better compared to tiadc. And if we add am335x to
it then we have the same naming scheme as the tsc side.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c |    3 +--
 drivers/mfd/ti_am335x_tscadc.c  |    2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 9939810..4bec91e 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -292,7 +292,7 @@ MODULE_DEVICE_TABLE(of, ti_adc_dt_ids);
 
 static struct platform_driver tiadc_driver = {
 	.driver = {
-		.name   = "tiadc",
+		.name   = "TI-am335x-adc",
 		.owner	= THIS_MODULE,
 		.pm	= TIADC_PM_OPS,
 		.of_match_table = of_match_ptr(ti_adc_dt_ids),
@@ -300,7 +300,6 @@ static struct platform_driver tiadc_driver = {
 	.probe	= tiadc_probe,
 	.remove	= tiadc_remove,
 };
-
 module_platform_driver(tiadc_driver);
 
 MODULE_DESCRIPTION("TI ADC controller driver");
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 5fb8b1d..2532339 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -223,7 +223,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	if (adc_channels > 0) {
 		tscadc->adc_cell = tscadc->used_cells;
 		cell = &tscadc->cells[tscadc->used_cells++];
-		cell->name = "tiadc";
+		cell->name = "TI-am335x-adc";
 		cell->of_compatible = "ti,am3359-adc";
 		cell->platform_data = &tscadc;
 		cell->pdata_size = sizeof(tscadc);
-- 
1.7.10.4

[PATCH 17/21] input: ti_am335x_adc: use only FIFO0 and clean up a little

[Sebastian Andrzej Siewior]

The driver programs a threshold of "coordinate_readouts" say 5. The
REG_FIFO0THR registers says it should it be programmed to "threshold
minus one". The driver does not expect just 5 coordinates but 5 * 2 + 2.
Multiplied by two because 5 for X and 5 for Y and plus 2 because we have
two Z.
The whole thing kind of works because It reads the 5 coordinates for X
and Y from FIFO0 and FIFO1 and the last element in each FIFO is ignored
within the loop and read later.
Nothing guaranties that FIFO1 is ready by the time it is read. In fact I
could see that that FIFO1 reaturns for Y channels 8,9, 10, 12, 6 and for
Y channel 7 for Z. The problem is that channel 7 and channel 12 got
somehow mixed up.
The other Problem is that FIFO1 is also used by the IIO part leading to
wrong results if both (tsc & adc) are used.

The patch tries to clean up the whole thing a little:
- Remove the +1 and -1 in REG_STEPCONFIG, REG_STEPDELAY and its counter
  part in the for loop. This is just confusing.

- Use only FIFO0 in TSC. The fifo has space for 64 entries so should be
  fine.

- Read the whole FIFO in one function and check the channel.

- in case we dawdle around, make sure we only read a multiple of our
  coordinate set. On the second interrupt we will cleanup the remaining
  enties.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c           |    2 +-
 drivers/input/touchscreen/ti_am335x_tsc.c |   78 +++++++++++++++--------------
 include/linux/mfd/ti_am335x_tscadc.h      |    4 +-
 3 files changed, 44 insertions(+), 40 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 4bec91e..307a7c0 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -75,7 +75,7 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
 
 	stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1;
 
-	for (i = (steps + 1); i <= TOTAL_STEPS; i++) {
+	for (i = steps; i < TOTAL_STEPS; i++) {
 		tiadc_writel(adc_dev, REG_STEPCONFIG(i),
 				stepconfig | STEPCONFIG_INP(channels));
 		tiadc_writel(adc_dev, REG_STEPDELAY(i),
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index ff3215d..1bceb25 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -120,11 +120,9 @@ static int titsc_config_wires(struct titsc *ts_dev)
 static void titsc_step_config(struct titsc *ts_dev)
 {
 	unsigned int	config;
-	unsigned int	stepenable = 0;
-	int i, total_steps;
-
-	/* Configure the Step registers */
-	total_steps = 2 * ts_dev->coordinate_readouts;
+	int i;
+	int end_step;
+	u32 stepenable;
 
 	config = STEPCONFIG_MODE_HWSYNC |
 			STEPCONFIG_AVG_16 | ts_dev->bit_xp;
@@ -142,7 +140,9 @@ static void titsc_step_config(struct titsc *ts_dev)
 		break;
 	}
 
-	for (i = 1; i <= ts_dev->coordinate_readouts; i++) {
+	/* 1 … coordinate_readouts is for X */
+	end_step = ts_dev->coordinate_readouts;
+	for (i = 0; i < end_step; i++) {
 		titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
 		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
 	}
@@ -150,7 +150,7 @@ static void titsc_step_config(struct titsc *ts_dev)
 	config = 0;
 	config = STEPCONFIG_MODE_HWSYNC |
 			STEPCONFIG_AVG_16 | ts_dev->bit_yn |
-			STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1;
+			STEPCONFIG_INM_ADCREFM;
 	switch (ts_dev->wires) {
 	case 4:
 		config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
@@ -164,12 +164,13 @@ static void titsc_step_config(struct titsc *ts_dev)
 		break;
 	}
 
-	for (i = (ts_dev->coordinate_readouts + 1); i <= total_steps; i++) {
+	/* coordinate_readouts … coordinate_readouts * 2 is for Y */
+	end_step = ts_dev->coordinate_readouts * 2;
+	for (i = ts_dev->coordinate_readouts; i < end_step; i++) {
 		titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
 		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
 	}
 
-	config = 0;
 	/* Charge step configuration */
 	config = ts_dev->bit_xp | ts_dev->bit_yn |
 			STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR |
@@ -178,35 +179,39 @@ static void titsc_step_config(struct titsc *ts_dev)
 	titsc_writel(ts_dev, REG_CHARGECONFIG, config);
 	titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
 
-	config = 0;
-	/* Configure to calculate pressure */
+	/* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */
 	config = STEPCONFIG_MODE_HWSYNC |
 			STEPCONFIG_AVG_16 | ts_dev->bit_yp |
 			ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
 			STEPCONFIG_INP(ts_dev->inp_xp);
-	titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config);
-	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 1),
+	titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
+	titsc_writel(ts_dev, REG_STEPDELAY(end_step),
 			STEPCONFIG_OPENDLY);
 
-	config |= STEPCONFIG_INP(ts_dev->inp_yn) | STEPCONFIG_FIFO1;
-	titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config);
-	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
+	end_step++;
+	config |= STEPCONFIG_INP(ts_dev->inp_yn);
+	titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
+	titsc_writel(ts_dev, REG_STEPDELAY(end_step),
 			STEPCONFIG_OPENDLY);
 
 	/* The steps1 … end and bit 0 for TS_Charge */
-	stepenable = (1 << (total_steps + 2)) - 1;
+	stepenable = (1 << (end_step + 2)) - 1;
 	am335x_tsc_se_set(ts_dev->mfd_tscadc, stepenable);
 }
 
 static void titsc_read_coordinates(struct titsc *ts_dev,
-				    unsigned int *x, unsigned int *y)
+		u32 *x, u32 *y, u32 *z1, u32 *z2)
 {
 	unsigned int fifocount = titsc_readl(ts_dev, REG_FIFO0CNT);
 	unsigned int prev_val_x = ~0, prev_val_y = ~0;
 	unsigned int prev_diff_x = ~0, prev_diff_y = ~0;
 	unsigned int read, diff;
 	unsigned int i, channel;
+	unsigned int creads = ts_dev->coordinate_readouts;
 
+	*z1 = *z2 = 0;
+	if (fifocount % (creads * 2 + 2))
+		fifocount -= fifocount % (creads * 2 + 2);
 	/*
 	 * Delta filter is used to remove large variations in sampled
 	 * values from ADC. The filter tries to predict where the next
@@ -215,32 +220,32 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
 	 * algorithm compares the difference with that of a present value,
 	 * if true the value is reported to the sub system.
 	 */
-	for (i = 0; i < fifocount - 1; i++) {
+	for (i = 0; i < fifocount; i++) {
 		read = titsc_readl(ts_dev, REG_FIFO0);
-		channel = read & 0xf0000;
-		channel = channel >> 0x10;
-		if ((channel >= 0) && (channel < ts_dev->coordinate_readouts)) {
-			read &= 0xfff;
+
+		channel = (read & 0xf0000) >> 16;
+		read &= 0xfff;
+		if (channel < creads) {
 			diff = abs(read - prev_val_x);
 			if (diff < prev_diff_x) {
 				prev_diff_x = diff;
 				*x = read;
 			}
 			prev_val_x = read;
-		}
 
-		read = titsc_readl(ts_dev, REG_FIFO1);
-		channel = read & 0xf0000;
-		channel = channel >> 0x10;
-		if ((channel >= ts_dev->coordinate_readouts) &&
-			(channel < (2 * ts_dev->coordinate_readouts - 1))) {
-			read &= 0xfff;
+		} else if (channel < creads * 2) {
 			diff = abs(read - prev_val_y);
 			if (diff < prev_diff_y) {
 				prev_diff_y = diff;
 				*y = read;
 			}
 			prev_val_y = read;
+
+		} else if (channel < creads * 2 + 1) {
+			*z1 = read;
+
+		} else if (channel < creads * 2 + 2) {
+			*z2 = read;
 		}
 	}
 }
@@ -256,10 +261,8 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 
 	status = titsc_readl(ts_dev, REG_IRQSTATUS);
 	if (status & IRQENB_FIFO0THRES) {
-		titsc_read_coordinates(ts_dev, &x, &y);
 
-		z1 = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
-		z2 = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
+		titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
 
 		if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
 			/*
@@ -267,10 +270,10 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 			 * Resistance(touch) = x plate resistance *
 			 * x postion/4096 * ((z2 / z1) - 1)
 			 */
-			z = z2 - z1;
+			z = z1 - z2;
 			z *= x;
 			z *= ts_dev->x_plate_resistance;
-			z /= z1;
+			z /= z2;
 			z = (z + 2047) >> 12;
 
 			if (z <= MAX_12BIT) {
@@ -391,7 +394,8 @@ static int titsc_probe(struct platform_device *pdev)
 		goto err_free_irq;
 	}
 	titsc_step_config(ts_dev);
-	titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->coordinate_readouts);
+	titsc_writel(ts_dev, REG_FIFO0THR,
+			ts_dev->coordinate_readouts * 2 + 2 - 1);
 
 	input_dev->name = "ti-tsc";
 	input_dev->dev.parent = &pdev->dev;
@@ -468,7 +472,7 @@ static int titsc_resume(struct device *dev)
 	}
 	titsc_step_config(ts_dev);
 	titsc_writel(ts_dev, REG_FIFO0THR,
-			ts_dev->coordinate_readouts);
+			ts_dev->coordinate_readouts * 2 + 2 - 1);
 	return 0;
 }
 
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
index 533f200..8d73fe2 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -30,8 +30,8 @@
 #define REG_IDLECONFIG		0x058
 #define REG_CHARGECONFIG	0x05C
 #define REG_CHARGEDELAY		0x060
-#define REG_STEPCONFIG(n)	(0x64 + ((n - 1) * 8))
-#define REG_STEPDELAY(n)	(0x68 + ((n - 1) * 8))
+#define REG_STEPCONFIG(n)	(0x64 + ((n) * 8))
+#define REG_STEPDELAY(n)	(0x68 + ((n) * 8))
 #define REG_FIFO0CNT		0xE4
 #define REG_FIFO0THR		0xE8
 #define REG_FIFO1CNT		0xF0
-- 
1.7.10.4

[PATCH 18/21] input: ti_am335x_tsc: ACK the HW_PEN irq in ISR

[Sebastian Andrzej Siewior]

The interrupt source IRQENB_HW_PEN is enabled in suspend and suposed to
be used as a wake up source. Once this interrupt source is unmaksed, the
devices ends up in ISR and never continues.
This change ACKs the interrupt and disables it so the system does not
freeze.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 1bceb25..2ba7703 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -308,6 +308,12 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 		irqclr |= IRQENB_PENUP;
 	}
 
+	if (status & IRQENB_HW_PEN) {
+
+		titsc_writel(ts_dev, REG_IRQWAKEUP, 0x00);
+		titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
+	}
+
 	titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
 
 	am335x_tsc_se_update(ts_dev->mfd_tscadc);
-- 
1.7.10.4

[PATCH 19/21] input: ti_am335x_tsc: return IRQ_NONE if there was no IRQ for us

[Sebastian Andrzej Siewior]

The previous patch ("input/ti_am335x_tsc: ACK the HW_PEN irq in ISR")
acked the interrupt so we don't freeze if we don't handle an enabled
interrupt source. The interrupt core has a mechanism for this and to get
it work one should only say that it handled an interrupt if it is
actually the case.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 2ba7703..0e9f02a 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -314,10 +314,12 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 		titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
 	}
 
-	titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
-
-	am335x_tsc_se_update(ts_dev->mfd_tscadc);
-	return IRQ_HANDLED;
+	if (irqclr) {
+		titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
+		am335x_tsc_se_update(ts_dev->mfd_tscadc);
+		return IRQ_HANDLED;
+	}
+	return IRQ_NONE;
 }
 
 static int titsc_parse_dt(struct platform_device *pdev,
-- 
1.7.10.4

[PATCH 20/21] iio: ti_am335x_adc: Allow to specify input line

[Sebastian Andrzej Siewior]

The TSC part allows to specify the input lines. The IIO part assumes
that it usues always the last few, that means if IIO has adc-channels
set to 2 it will use channel 6 and 7. However it might make sense to use
only 6.
This patch changes the device property (which was introduced recently
and was never in an official release) in a way that the user can specify
which of the AIN lines should be used. In Addition to this, the name is
now AINx where x is the channel number i.e. for AIN6 we would have 6.
Prior this, it always started counting at 0 which is confusing. In
addition to this, it also checks for correct step number during reading
and does not rely on proper FIFO depth.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 arch/arm/boot/dts/am335x-evm.dts |    2 +-
 drivers/iio/adc/ti_am335x_adc.c  |   57 +++++++++++++++++++++++++-------------
 drivers/mfd/ti_am335x_tscadc.c   |   20 +++++++++++--
 3 files changed, 56 insertions(+), 23 deletions(-)

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 26fea97..0fa4c7f 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -255,6 +255,6 @@
 	};
 
 	adc {
-		ti,adc-channels = <4>;
+		ti,adc-channels = <4 5 6 7>;
 	};
 };
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 307a7c0..8ffe52d 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -32,6 +32,8 @@
 struct tiadc_device {
 	struct ti_tscadc_dev *mfd_tscadc;
 	int channels;
+	u8 channel_line[8];
+	u8 channel_step[8];
 };
 
 static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
@@ -57,7 +59,7 @@ static u32 get_adc_step_mask(struct tiadc_device *adc_dev)
 static void tiadc_step_config(struct tiadc_device *adc_dev)
 {
 	unsigned int stepconfig;
-	int i, channels = 0, steps;
+	int i, steps;
 	u32 step_en;
 
 	/*
@@ -71,16 +73,18 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
 	 */
 
 	steps = TOTAL_STEPS - adc_dev->channels;
-	channels = TOTAL_CHANNELS - adc_dev->channels;
-
 	stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1;
 
-	for (i = steps; i < TOTAL_STEPS; i++) {
-		tiadc_writel(adc_dev, REG_STEPCONFIG(i),
-				stepconfig | STEPCONFIG_INP(channels));
-		tiadc_writel(adc_dev, REG_STEPDELAY(i),
+	for (i = 0; i < adc_dev->channels; i++) {
+		int chan;
+
+		chan = adc_dev->channel_line[i];
+		tiadc_writel(adc_dev, REG_STEPCONFIG(steps),
+				stepconfig | STEPCONFIG_INP(chan));
+		tiadc_writel(adc_dev, REG_STEPDELAY(steps),
 				STEPCONFIG_OPENDLY);
-		channels++;
+		adc_dev->channel_step[i] = steps;
+		steps++;
 	}
 	step_en = get_adc_step_mask(adc_dev);
 	am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
@@ -115,9 +119,9 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
 
 		chan->type = IIO_VOLTAGE;
 		chan->indexed = 1;
-		chan->channel = i;
+		chan->channel = adc_dev->channel_line[i];
 		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
-		chan->datasheet_name = chan_name_ain[i];
+		chan->datasheet_name = chan_name_ain[chan->channel];
 		chan->scan_type.sign = 'u';
 		chan->scan_type.realbits = 12;
 		chan->scan_type.storagebits = 32;
@@ -139,7 +143,8 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
 {
 	struct tiadc_device *adc_dev = iio_priv(indio_dev);
 	int i;
-	unsigned int fifo1count, readx1;
+	unsigned int fifo1count, read;
+	u32 step = UINT_MAX;
 
 	/*
 	 * When the sub-system is first enabled,
@@ -152,11 +157,20 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
 	 * Hence we need to flush out this data.
 	 */
 
+	for (i = 0; i < ARRAY_SIZE(adc_dev->channel_step); i++) {
+		if (chan->channel == adc_dev->channel_line[i]) {
+			step = adc_dev->channel_step[i];
+			break;
+		}
+	}
+	if (WARN_ON_ONCE(step == UINT_MAX))
+		return -EINVAL;
+
 	fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 	for (i = 0; i < fifo1count; i++) {
-		readx1 = tiadc_readl(adc_dev, REG_FIFO1);
-		if (i == chan->channel)
-			*val = readx1 & 0xfff;
+		read = tiadc_readl(adc_dev, REG_FIFO1);
+		if (read >> 16 == step)
+			*val = read & 0xfff;
 	}
 	am335x_tsc_se_update(adc_dev->mfd_tscadc);
 
@@ -172,8 +186,11 @@ static int tiadc_probe(struct platform_device *pdev)
 	struct iio_dev		*indio_dev;
 	struct tiadc_device	*adc_dev;
 	struct device_node	*node = pdev->dev.of_node;
+	struct property		*prop;
+	const __be32		*cur;
 	int			err;
-	u32			val32;
+	u32			val;
+	int			channels = 0;
 
 	if (!node) {
 		dev_err(&pdev->dev, "Could not find valid DT data.\n");
@@ -190,11 +207,11 @@ static int tiadc_probe(struct platform_device *pdev)
 
 	adc_dev->mfd_tscadc = ti_tscadc_dev_get(pdev);
 
-	err = of_property_read_u32(node,
-			"ti,adc-channels", &val32);
-	if (err < 0)
-		goto err_free_device;
-	adc_dev->channels = val32;
+	of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
+		adc_dev->channel_line[channels] = val;
+		channels++;
+	}
+	adc_dev->channels = channels;
 
 	indio_dev->dev.parent = &pdev->dev;
 	indio_dev->name = dev_name(&pdev->dev);
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index 2532339..b003a16 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -91,9 +91,13 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	struct clk		*clk;
 	struct device_node	*node = pdev->dev.of_node;
 	struct mfd_cell		*cell;
+	struct property         *prop;
+	const __be32            *cur;
+	u32			val;
 	int			err, ctrl;
 	int			clk_value, clock_rate;
 	int			tsc_wires = 0, adc_channels = 0, total_channels;
+	int			readouts = 0;
 
 	if (!pdev->dev.of_node) {
 		dev_err(&pdev->dev, "Could not find valid DT data.\n");
@@ -102,10 +106,17 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 
 	node = of_get_child_by_name(pdev->dev.of_node, "tsc");
 	of_property_read_u32(node, "ti,wires", &tsc_wires);
+	of_property_read_u32(node, "ti,coordiante-readouts", &readouts);
 
 	node = of_get_child_by_name(pdev->dev.of_node, "adc");
-	of_property_read_u32(node, "ti,adc-channels", &adc_channels);
-
+	of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
+		adc_channels++;
+		if (val > 7) {
+			dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
+					val);
+			return -EINVAL;
+		}
+	}
 	total_channels = tsc_wires + adc_channels;
 	if (total_channels > 8) {
 		dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
@@ -116,6 +127,11 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	if (readouts * 2 + 2 + adc_channels > 16) {
+		dev_err(&pdev->dev, "Too many step configurations requested\n");
+		return -EINVAL;
+	}
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "no memory resource defined.\n");
-- 
1.7.10.4

[PATCH 21/21] iio: ti_am335x_adc: check if we found the value

[Sebastian Andrzej Siewior]

Usually we get all the values we wanted but it is possible, that te ADC
unit is busy performing the conversation for the HW events. In that case
-EBUSY is returned and the user may re-call the function.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/iio/adc/ti_am335x_adc.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 8ffe52d..4427e8e 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -145,6 +145,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
 	int i;
 	unsigned int fifo1count, read;
 	u32 step = UINT_MAX;
+	bool found = false;
 
 	/*
 	 * When the sub-system is first enabled,
@@ -169,11 +170,14 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
 	fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
 	for (i = 0; i < fifo1count; i++) {
 		read = tiadc_readl(adc_dev, REG_FIFO1);
-		if (read >> 16 == step)
+		if (read >> 16 == step) {
 			*val = read & 0xfff;
+			found = true;
+		}
 	}
 	am335x_tsc_se_update(adc_dev->mfd_tscadc);
-
+	if (found == false)
+		return -EBUSY;
 	return IIO_VAL_INT;
 }
 
-- 
1.7.10.4

Re: am335x: TSC & ADC reworking including DT pieces, take 5

[Samuel Ortiz]

Hi Sebastian,

On Wed, Jun 12, 2013 at 06:58:01PM +0200, Sebastian Andrzej Siewior wrote:
> Hi Samuel,
> 
> I did the cosmetic changes of the subject line and removed the changes
> from within the sob lines in each patch. I dropped the "#define XPP
> STEPCONFIG_XPP" thingy and patch #1 which removed regmap from mfd. Not
> that I agree with it, I just do not want to miss the merge window due to
> this.
> 
> The following changes since commit d683b96b072dc4680fc74964eca77e6a23d1fa6e:
> 
>   Linux 3.10-rc4 (2013-06-02 17:11:17 +0900)
> 
> are available in the git repository at:
> 
>   git://breakpoint.cc/bigeasy/linux tags/am335x_tsc-adc
Pulled and pushed back to mfd-next, thanks.
I fixed a couple of unused variable warnings on top of it.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/

Re: am335x: TSC & ADC reworking including DT pieces, take 5

[Sebastian Andrzej Siewior]

On 06/13/2013 11:07 AM, Samuel Ortiz wrote:
> Hi Sebastian,

Hi Samuel,

> Pulled and pushed back to mfd-next, thanks.

Thank you.

> I fixed a couple of unused variable warnings on top of it.

I saw your patch at git.k.o and I am asking you not to taking it :)
The code is:

        of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
                 adc_channels++;
                 if (val > 7) {
                         dev_err(&pdev->dev, " PIN numbers are 0..7 (not
%d)\n",
                                         val);
                         return -EINVAL;
                 }
         }

and without CONFIG_OF of_property_for_each_u32() becomes most likely
empty. That is why I haven't seen it.
So either the macro should be changed to tell the compiler that the
variables are used (so the warning does not show up) or let the driver
depend on CONFIG_OF. I will look at the former and can prepare a patch
for the latter if you want.

> 
> Cheers,
> Samuel.
> 

Sebastian

Re: am335x: TSC & ADC reworking including DT pieces, take 5

[Samuel Ortiz]

Hi Sebastian,

On Thu, Jun 13, 2013 at 11:25:26AM +0200, Sebastian Andrzej Siewior wrote:
> > I fixed a couple of unused variable warnings on top of it.
> 
> I saw your patch at git.k.o and I am asking you not to taking it :)
I understand why now, I'll remove it. Sorry about that.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/