thermal: exynos: Add support to access common register for multistance

This patch adds support to parse one more common set of TMU register. First
set of register belongs to each instance of TMU and second set belongs to
common TMU registers.
Acked-by: NJonghwa Lee <jonghwa3.lee@samsung.com>
Acked-by: NKukjin Kim <kgene.kim@samsung.com>
Acked-by: NEduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: NAmit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: NEduardo Valentin <eduardo.valentin@ti.com>

drivers/thermal/samsung/exynos_tmu.c

@@ -40,6 +40,7 @@
  * @id: identifier of the one instance of the TMU controller.
  * @pdata: pointer to the tmu platform/configuration data
  * @base: base address of the single instance of the TMU controller.
+ * @base_common: base address of the common registers of the TMU controller.
  * @irq: irq number of the TMU controller.
  * @soc: id of the SOC type.
  * @irq_work: pointer to the irq work structure.
@@ -53,6 +54,7 @@ struct exynos_tmu_data {
 	int id;
 	struct exynos_tmu_platform_data *pdata;
 	void __iomem *base;
+	void __iomem *base_common;
 	int irq;
 	enum soc_type soc;
 	struct work_struct irq_work;
@@ -478,6 +480,24 @@ static int exynos_map_dt_data(struct platform_device *pdev)
 		return -ENODEV;
 	}
 	data->pdata = pdata;
+	/*
+	 * Check if the TMU shares some registers and then try to map the
+	 * memory of common registers.
+	 */
+	if (!TMU_SUPPORTS(pdata, SHARED_MEMORY))
+		return 0;
+
+	if (of_address_to_resource(pdev->dev.of_node, 1, &res)) {
+		dev_err(&pdev->dev, "failed to get Resource 1\n");
+		return -ENODEV;
+	}
+
+	data->base_common = devm_ioremap(&pdev->dev, res.start,
+					resource_size(&res));
+	if (!data->base) {
+		dev_err(&pdev->dev, "Failed to ioremap memory\n");
+		return -ENOMEM;
+	}
 
 	return 0;
 }