[PATCH v2 31/46] mfd: ti_am335x_tscadc: Add a boolean to clarify the presence of a touchscreen

Miquel Raynal
2021-09-02T21:52:57Z

Just checking the number of wires will soon not be enough, add a boolean
to indicated the actual use or not of the touchscreen.

Certain checks only make sense when there is a touchscreen wired. Make
this checks explicitly depend on the presence of the touchscreen.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/mfd/ti_am335x_tscadc.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index f30bcdf600fb..cfdef833dffb 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -120,6 +120,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)
struct mfd_cell *cell;
struct property *prop;
const __be32 *cur;
+ bool use_tsc = false;
u32 val;
int err;
int tscmag_wires = 0, adc_channels = 0, cell_idx = 0, total_channels;
@@ -143,6 +144,8 @@ static int ti_tscadc_probe(struct platform_device *pdev)
of_property_read_u32(node, "ti,wires", &tscmag_wires);
of_property_read_u32(node, "ti,coordiante-readouts", &readouts);
of_node_put(node);
+ if (tscmag_wires)
+ use_tsc = true;

node = of_get_child_by_name(pdev->dev.of_node, "adc");
of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
@@ -168,7 +171,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)
return -EINVAL;
}

- if (readouts * 2 + 2 + adc_channels > 16) {
+ if (use_tsc && (readouts * 2 + 2 + adc_channels > 16)) {
dev_err(&pdev->dev, "Too many step configurations requested\n");
return -EINVAL;
}
@@ -221,7 +224,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)

/* Set the control register bits */
tscadc->ctrl = CNTRLREG_TSC_STEPCONFIGWRT | CNTRLREG_STEPID;
- if (tscmag_wires > 0) {
+ if (use_tsc) {
tscadc->ctrl |= CNTRLREG_TSC_ENB;
if (tscmag_wires == 5)
tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
--
2.27.0