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@xxxxxx>
---
v5:
- print out a warning when ti,charge-delay is not specified
drivers/input/touchscreen/ti_am335x_tsc.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 8650b1dd24dc..9cb8b4a01dca 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));
}
--
1.9.1
--
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