[PATCH 2/3] input: ti_am335x_tsc: Remove DT wire-config parameter

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

From: Jeff Lance <j-lance1@ti.com>

With the touschscreen in am335x, you do not have the option to mux the
analog input lines. You must connect the analog input to the corresponding
touchscreen terminal.
This patch removes the code that is parsing the ti,wire-config and uses
the "default" parameters instead.
In short,
	inp_xp => STEPCONFIG_INP(0)
	inp_xn => STEPCONFIG_INP(1)
	inp_yp => STEPCONFIG_INP(2)
	inp_yn => STEPCONFIG_INP(3)
	bit_xp => STEPCONFIG_XPP
	bit_xn => STEPCONFIG_XNN
	bit_yp => STEPCONFIG_YPP
	bit_yn => STEPCONFIG_YNN

Cc: "Benoît Cousson" <bcousson@baylibre.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Jeff Lance <j-lance1@ti.com>
[bigeasy: refresh, drop AIN defines.]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/input/touchscreen/ti_am335x_tsc.c | 109 +++++-------------------------
 1 file changed, 16 insertions(+), 93 deletions(-)

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 092fa8b31c67..92fb473621b0 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -33,13 +33,6 @@
 #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;
@@ -48,9 +41,6 @@ struct titsc {
 	unsigned int		x_plate_resistance;
 	bool			pen_down;
 	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;
 	u32			step_mask;
 };
 
@@ -65,58 +55,6 @@ 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;
@@ -124,19 +62,17 @@ static void titsc_step_config(struct titsc *ts_dev)
 	int end_step;
 	u32 stepenable;
 
-	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | ts_dev->bit_xp;
+	config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | STEPCONFIG_XPP;
 	switch (ts_dev->wires) {
 	case 4:
-		config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
+		config |= STEPCONFIG_INP(2) | STEPCONFIG_XNN;
 		break;
 	case 5:
-		config |= ts_dev->bit_yn |
-				STEPCONFIG_INP_AN4 | ts_dev->bit_xn |
-				ts_dev->bit_yp;
+		config |= STEPCONFIG_YNN | STEPCONFIG_INP_AN4 | STEPCONFIG_XNN |
+				STEPCONFIG_YPP;
 		break;
 	case 8:
-		config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
+		config |= STEPCONFIG_INP(2) | STEPCONFIG_XNN;
 		break;
 	}
 
@@ -147,20 +83,18 @@ static void titsc_step_config(struct titsc *ts_dev)
 		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
 	}
 
-	config = 0;
-	config = STEPCONFIG_MODE_HWSYNC |
-			STEPCONFIG_AVG_16 | ts_dev->bit_yn |
+	config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | STEPCONFIG_YNN |
 			STEPCONFIG_INM_ADCREFM;
 	switch (ts_dev->wires) {
 	case 4:
-		config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
+		config |= STEPCONFIG_YPP | STEPCONFIG_INP(0);
 		break;
 	case 5:
-		config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 |
+		config |= STEPCONFIG_XPP | STEPCONFIG_INP_AN4 |
 				STEPCONFIG_XNP | STEPCONFIG_YPN;
 		break;
 	case 8:
-		config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
+		config |= STEPCONFIG_YPP | STEPCONFIG_INP(0);
 		break;
 	}
 
@@ -172,24 +106,23 @@ static void titsc_step_config(struct titsc *ts_dev)
 	}
 
 	/* Charge step configuration */
-	config = ts_dev->bit_xp | ts_dev->bit_yn |
-			STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR |
-			STEPCHARGE_INM_AN1 | STEPCHARGE_INP(ts_dev->inp_yp);
+	config = STEPCONFIG_XPP | STEPCONFIG_YNN | STEPCHARGE_RFP_XPUL |
+		STEPCHARGE_RFM_XNUR | STEPCHARGE_INM_AN1 | STEPCHARGE_INP(2);
 
 	titsc_writel(ts_dev, REG_CHARGECONFIG, config);
 	titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
 
 	/* 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);
+			STEPCONFIG_AVG_16 | STEPCONFIG_YPP |
+			STEPCONFIG_XNN | STEPCONFIG_INM_ADCREFM |
+			STEPCONFIG_INP(0);
 	titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
 	titsc_writel(ts_dev, REG_STEPDELAY(end_step),
 			STEPCONFIG_OPENDLY);
 
 	end_step++;
-	config |= STEPCONFIG_INP(ts_dev->inp_yn);
+	config |= STEPCONFIG_INP(3);
 	titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
 	titsc_writel(ts_dev, REG_STEPDELAY(end_step),
 			STEPCONFIG_OPENDLY);
@@ -364,12 +297,7 @@ static int titsc_parse_dt(struct platform_device *pdev,
 		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));
+	return err;
 }
 
 /*
@@ -411,11 +339,6 @@ 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->coordinate_readouts * 2 + 2 - 1);
-- 
2.1.0

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