MFD: ti_tscadc: Disable TSC config registers in adc mode
AFE Pen Ctrl and TouchScreen transistors enabling is not
required when only ADC mode is being used, so check for availability of
TSC driver before accessing control register.
Signed-off-by: Patil, Rachna <rachna@ti.com>
Acked-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e0852ec..cd74d59 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -204,13 +204,14 @@
/* Set the control register bits */
ctrl = CNTRLREG_STEPCONFIGWRT |
- CNTRLREG_TSCENB |
- CNTRLREG_STEPID |
- CNTRLREG_4WIRE;
+ CNTRLREG_STEPID;
+ if (tsc_wires > 0)
+ ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
tscadc_writel(tscadc, REG_CTRL, ctrl);
/* Set register bits for Idle Config Mode */
- tscadc_idle_config(tscadc);
+ if (tsc_wires > 0)
+ tscadc_idle_config(tscadc);
/* Enable the TSC module enable bit */
ctrl = tscadc_readl(tscadc, REG_CTRL);
@@ -290,10 +291,13 @@
pm_runtime_get_sync(dev);
/* context restore */
- ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_TSCENB |
- CNTRLREG_STEPID | CNTRLREG_4WIRE;
+ ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
+ if (tscadc_dev->tsc_cell != -1)
+ ctrl |= CNTRLREG_TSCENB | CNTRLREG_4WIRE;
tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
- tscadc_idle_config(tscadc_dev);
+
+ if (tscadc_dev->tsc_cell != -1)
+ tscadc_idle_config(tscadc_dev);
am335x_tsc_se_update(tscadc_dev);
restore = tscadc_readl(tscadc_dev, REG_CTRL);
tscadc_writel(tscadc_dev, REG_CTRL,