Input: ti_am335x_tsc - read charge delay from DT

This patch reads charge delay from tsc DT node and writes to
REG_CHARGEDELAY register. If the charge delay is not specified in DT then
default value of 0x400(CHARGEDLY_OPENDLY) is used.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 0625c102a1d0..7c0f6b21559d 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -52,6 +52,7 @@ struct titsc {
         u32                     bit_xp, bit_xn, bit_yp, bit_yn;
         u32                     inp_xp, inp_xn, inp_yp, inp_yn;
         u32                     step_mask;
+        u32                     charge_delay;
 };
 
 static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
@@ -177,7 +178,7 @@ static void titsc_step_config(struct titsc *ts_dev)
 
         config = titsc_readl(ts_dev, REG_IDLECONFIG);
         titsc_writel(ts_dev, REG_CHARGECONFIG, config);
-        titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
+        titsc_writel(ts_dev, REG_CHARGEDELAY, ts_dev->charge_delay);
 
         /* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */
         config = STEPCONFIG_MODE_HWSYNC |
@@ -368,6 +369,17 @@ static int titsc_parse_dt(struct platform_device *pdev,
         if (err < 0)
                 return err;
 
+        err = of_property_read_u32(node, "ti,charge-delay",
+                                   &ts_dev->charge_delay);
+        /*
+         * If ti,charge-delay value is not specified, then use
+         * CHARGEDLY_OPENDLY as the default value.
+         */
+        if (err < 0) {
+                ts_dev->charge_delay = CHARGEDLY_OPENDLY;
+                dev_warn(&pdev->dev, "ti,charge-delay not specified\n");
+        }
+
         return of_property_read_u32_array(node, "ti,wire-config",
                         ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
 }