thermal: qcom: tsens: Allow number of sensors to come from DT

For platforms that has multiple copies of the TSENS hardware block it's
necessary to be able to specify the number of sensors per block in DeviceTree.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

Documentation/devicetree/bindings/thermal/qcom-tsens.txt

@@ -8,6 +8,7 @@ Required properties:
 
 - reg: Address range of the thermal registers
 - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description.
+- #qcom,sensors: Number of sensors in tsens block
 - Refer to Documentation/devicetree/bindings/nvmem/nvmem.txt to know how to specify
 nvmem cells
 

drivers/thermal/qcom/tsens.c

@@ -116,6 +116,7 @@ static int tsens_probe(struct platform_device *pdev)
 	struct tsens_device *tmdev;
 	const struct tsens_data *data;
 	const struct of_device_id *id;
+	u32 num_sensors;
 
 	if (pdev->dev.of_node)
 		dev = &pdev->dev;
@@ -130,18 +131,23 @@ static int tsens_probe(struct platform_device *pdev)
 	else
 		data = &data_8960;
 
-	if (data->num_sensors <= 0) {
+	num_sensors = data->num_sensors;
+
+	if (np)
+		of_property_read_u32(np, "#qcom,sensors", &num_sensors);
+
+	if (num_sensors <= 0) {
 		dev_err(dev, "invalid number of sensors\n");
 		return -EINVAL;
 	}
 
 	tmdev = devm_kzalloc(dev, sizeof(*tmdev) +
-			     data->num_sensors * sizeof(*s), GFP_KERNEL);
+			     num_sensors * sizeof(*s), GFP_KERNEL);
 	if (!tmdev)
 		return -ENOMEM;
 
 	tmdev->dev = dev;
-	tmdev->num_sensors = data->num_sensors;
+	tmdev->num_sensors = num_sensors;
 	tmdev->ops = data->ops;
 	for (i = 0;  i < tmdev->num_sensors; i++) {
 		if (data->hw_ids)