Merge tag 'am335x_tsc-adc' of git://breakpoint.cc/bigeasy/linux

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.

Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt

+* 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>;
+		};
+	}

arch/arm/boot/dts/am335x-evm.dts

@@ -244,3 +244,17 @@ &cpsw_emac0 {
 &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 5 6 7>;
+	};
+};

arch/arm/boot/dts/am33xx.dtsi

@@ -404,6 +404,24 @@ wkup_m3: wkup_m3@44d00000 {
 			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";

drivers/iio/adc/ti_am335x_adc.c

@@ -22,13 +22,18 @@
 #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/iio/machine.h>
+#include <linux/iio/driver.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;
 	int channels;
+	u8 channel_line[8];
+	u8 channel_step[8];
 };
 
 static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
@@ -42,10 +47,20 @@ 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;
+	int i, steps;
+	u32 step_en;
 
 	/*
 	 * There are 16 configurable steps and 8 analog input
@@ -58,43 +73,63 @@ 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 + 1); 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++;
 	}
-	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 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->channel = adc_dev->channel_line[i];
 		chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
+		chan->datasheet_name = chan_name_ain[chan->channel];
+		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)
@@ -108,7 +143,9 @@ 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;
+	bool found = false;
 
 	/*
 	 * When the sub-system is first enabled,
@@ -121,14 +158,26 @@ 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;
+			found = true;
+		}
 	}
-	tiadc_writel(adc_dev, REG_SE, STPENB_STEPENB);
-
+	am335x_tsc_se_update(adc_dev->mfd_tscadc);
+	if (found == false)
+		return -EBUSY;
 	return IIO_VAL_INT;
 }
 
@@ -140,13 +189,15 @@ 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 mfd_tscadc_board	*pdata;
+	struct device_node	*node = pdev->dev.of_node;
+	struct property		*prop;
+	const __be32		*cur;
 	int			err;
+	u32			val;
+	int			channels = 0;
 
-	pdata = tscadc_dev->dev->platform_data;
-	if (!pdata || !pdata->adc_init) {
-		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;
 	}
 
@@ -158,8 +209,13 @@ 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);
+
+	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);
@@ -191,10 +247,15 @@ 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;
@@ -205,9 +266,10 @@ 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);
@@ -243,16 +305,22 @@ 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",
+		.name   = "TI-am335x-adc",
 		.owner	= THIS_MODULE,
 		.pm	= TIADC_PM_OPS,
+		.of_match_table = of_match_ptr(ti_adc_dt_ids),
 	},
 	.probe	= tiadc_probe,
 	.remove	= tiadc_remove,
 };
-
 module_platform_driver(tiadc_driver);
 
 MODULE_DESCRIPTION("TI ADC controller driver");

drivers/input/touchscreen/ti_am335x_tsc.c

@@ -24,8 +24,9 @@
 #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>
 
 #include <linux/mfd/ti_am335x_tscadc.h>
 
@@ -33,6 +34,13 @@
 #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;
@@ -40,7 +48,10 @@ 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;
 };
 
 static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
@@ -54,92 +65,153 @@ 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;
-	int i, total_steps;
-
-	/* Configure the Step registers */
-	total_steps = 2 * ts_dev->steps_to_configure;
+	int i;
+	int end_step;
+	u32 stepenable;
 
 	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;
 	}
 
-	for (i = 1; i <= ts_dev->steps_to_configure; 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);
 	}
 
 	config = 0;
 	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | STEPCONFIG_YNN |
-			STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1;
+			STEPCONFIG_AVG_16 | ts_dev->bit_yn |
+			STEPCONFIG_INM_ADCREFM;
 	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;
 	}
 
-	for (i = (ts_dev->steps_to_configure + 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 = 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);
 
-	config = 0;
-	/* Configure to calculate pressure */
+	/* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */
 	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | STEPCONFIG_YPP |
-			STEPCONFIG_XNN | STEPCONFIG_INM_ADCREFM;
-	titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config);
-	titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 1),
+			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(end_step), config);
+	titsc_writel(ts_dev, REG_STEPDELAY(end_step),
 			STEPCONFIG_OPENDLY);
 
-	config |= STEPCONFIG_INP_AN3 | 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);
 
-	titsc_writel(ts_dev, REG_SE, STPENB_STEPENB_TC);
+	/* The steps1 … end and bit 0 for TS_Charge */
+	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
@@ -148,32 +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->steps_to_configure)) {
-			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->steps_to_configure) &&
-			(channel < (2 * ts_dev->steps_to_configure - 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;
 		}
 	}
 }
@@ -186,23 +258,11 @@ 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) {
-		titsc_read_coordinates(ts_dev, &x, &y);
 
-		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);
+		titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
 
 		if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
 			/*
@@ -210,10 +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) {
@@ -248,10 +308,53 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 		irqclr |= IRQENB_PENUP;
 	}
 
-	titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
+	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_SE, STPENB_STEPENB_TC);
-	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,
+					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));
 }
 
 /*
@@ -262,17 +365,9 @@ 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 mfd_tscadc_board	*pdata;
+	struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
 	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();
@@ -286,9 +381,12 @@ 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;
+
+	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);
@@ -298,8 +396,14 @@ 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);
+	titsc_writel(ts_dev, REG_FIFO0THR,
+			ts_dev->coordinate_readouts * 2 + 2 - 1);
 
 	input_dev->name = "ti-tsc";
 	input_dev->dev.parent = &pdev->dev;
@@ -329,11 +433,16 @@ 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);
 
+	/* total steps followed by the enable mask */
+	steps = 2 * ts_dev->coordinate_readouts + 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);
@@ -344,10 +453,11 @@ 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 +469,10 @@ 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);
@@ -369,7 +480,7 @@ 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 * 2 + 2 - 1);
 	return 0;
 }
 
@@ -382,13 +493,20 @@ 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,
 	.driver	= {
-		.name   = "tsc",
+		.name   = "TI-am335x-tsc",
 		.owner	= THIS_MODULE,
 		.pm	= TITSC_PM_OPS,
+		.of_match_table = of_match_ptr(ti_tsc_dt_ids),
 	},
 };
 module_platform_driver(ti_tsc_driver);

drivers/mfd/ti_am335x_tscadc.c

@@ -22,10 +22,10 @@
 #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>
-#include <linux/platform_data/ti_am335x_adc.h>
 
 static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg)
 {
@@ -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;
@@ -63,27 +89,48 @@ 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;
+	struct property         *prop;
+	const __be32            *cur;
+	u32			val;
 	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;
+	int			readouts = 0;
 
-	if (!pdata) {
-		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 (pdata->adc_init)
-		adc_channels = pdata->adc_init->adc_channels;
-
-	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);
+	of_property_read_u32(node, "ti,coordiante-readouts", &readouts);
+
+	node = of_get_child_by_name(pdev->dev.of_node, "adc");
+	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");
 		return -EINVAL;
 	}
+	if (total_channels == 0) {
+		dev_err(&pdev->dev, "Need atleast one channel.\n");
+		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) {
@@ -129,6 +176,7 @@ 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);
 
@@ -173,26 +221,37 @@ 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->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 = "TI-am335x-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->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 = "TI-am335x-adc";
+		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:
@@ -239,7 +298,7 @@ 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));
@@ -256,11 +315,18 @@ 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,

include/linux/input/ti_am335x_tsc.h

-#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.
- */
-
-struct tsc_data {
-	int wires;
-	int x_plate_resistance;
-	int steps_to_configure;
-};
-
-#endif

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
@@ -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)
@@ -73,8 +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)
@@ -96,7 +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)
@@ -125,22 +120,17 @@
 
 #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;
-};
-
 struct ti_tscadc_dev {
 	struct device *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;
 
 	/* tsc device */
 	struct titsc *tsc;
@@ -149,4 +139,15 @@ 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;
+}
+
+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

include/linux/platform_data/ti_am335x_adc.h

-#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