timer: cadence: Add bind function to driver

When DT node has pwm-cells property it shouldn't be bind as timer driver
but as PWM driver. That's why make sure that this property is checked.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/434ef195fbedea9f83672a12d1ace0da16e8832e.1634303847.git.michal.simek@xilinx.com

drivers/timer/cadence-ttc.c

@@ -97,6 +97,17 @@ static int cadence_ttc_of_to_plat(struct udevice *dev)
 	return 0;
 }
 
+static int cadence_ttc_bind(struct udevice *dev)
+{
+	const char *cells;
+
+	cells = dev_read_prop(dev, "#pwm-cells", NULL);
+	if (cells)
+		return -ENODEV;
+
+	return 0;
+}
+
 static const struct timer_ops cadence_ttc_ops = {
 	.get_count = cadence_ttc_get_count,
 };
@@ -114,4 +125,5 @@ U_BOOT_DRIVER(cadence_ttc) = {
 	.priv_auto	= sizeof(struct cadence_ttc_priv),
 	.probe = cadence_ttc_probe,
 	.ops = &cadence_ttc_ops,
+	.bind = cadence_ttc_bind,
 };