thermal: tsens: Add the SROT address map

On platforms whose device trees specify two address spaces for TSENS, the
second one points to the SROT registers. Initialise the SROT map on those
platforms.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/qcom/tsens-common.c

@@ -117,16 +117,26 @@ static const struct regmap_config tsens_config = {
 
 int __init init_common(struct tsens_device *tmdev)
 {
-	void __iomem *tm_base;
+	void __iomem *tm_base, *srot_base;
 	struct resource *res;
 	struct platform_device *op = of_find_device_by_node(tmdev->dev->of_node);
 
 	if (!op)
 		return -EINVAL;
 
-	/* The driver only uses the TM register address space for now */
 	if (op->num_resources > 1) {
+		/* DT with separate SROT and TM address space */
 		tmdev->tm_offset = 0;
+		res = platform_get_resource(op, IORESOURCE_MEM, 1);
+		srot_base = devm_ioremap_resource(&op->dev, res);
+		if (IS_ERR(srot_base))
+			return PTR_ERR(srot_base);
+
+		tmdev->srot_map = devm_regmap_init_mmio(tmdev->dev,
+							srot_base, &tsens_config);
+		if (IS_ERR(tmdev->srot_map))
+			return PTR_ERR(tmdev->srot_map);
+
 	} else {
 		/* old DTs where SROT and TM were in a contiguous 2K block */
 		tmdev->tm_offset = 0x1000;

drivers/thermal/qcom/tsens.h

@@ -70,6 +70,7 @@ struct tsens_device {
 	struct device			*dev;
 	u32				num_sensors;
 	struct regmap			*tm_map;
+	struct regmap			*srot_map;
 	u32				tm_offset;
 	struct tsens_context		ctx;
 	const struct tsens_ops		*ops;