thermal: tsens: Add support to split up register address space into two

There are two banks of registers for v2 TSENS IPs: SROT and TM. On older
SoCs these were contiguous, leading to DTs mapping them as one register
address space of size 0x2000. In newer SoCs, these two banks are not
contiguous anymore.

Add logic to init_common() to differentiate between old and new DTs and
adjust associated offsets for the TM register bank so that the old DTs will
continue to function correctly.

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

3 files changed, 15 insertions, 2 deletions

diff --git a/drivers/thermal/qcom/tsens-8996.c b/drivers/thermal/qcom/tsens-8996.c
index e1f77818d8fa..3e60cecd2c45 100644
--- a/drivers/thermal/qcom/tsens-8996.c
+++ b/drivers/thermal/qcom/tsens-8996.c
@@ -16,7 +16,7 @@
 #include <linux/regmap.h>
 #include "tsens.h"
 
-#define STATUS_OFFSET   0x10a0
+#define STATUS_OFFSET   0xa0
 #define LAST_TEMP_MASK  0xfff
 #define STATUS_VALID_BIT        BIT(21)
 #define CODE_SIGN_BIT           BIT(11)
@@ -28,7 +28,7 @@ static int get_temp_8996(struct tsens_device *tmdev, int id, int *temp)
         unsigned int sensor_addr;
         int last_temp = 0, last_temp2 = 0, last_temp3 = 0, ret;
 
-        sensor_addr = STATUS_OFFSET + s->hw_id * 4;
+        sensor_addr = tmdev->tm_offset + STATUS_OFFSET + s->hw_id * 4;
         ret = regmap_read(tmdev->map, sensor_addr, &code);
         if (ret)
                 return ret;
diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
index b1449ad67fc0..c22dc18c7c65 100644
--- a/drivers/thermal/qcom/tsens-common.c
+++ b/drivers/thermal/qcom/tsens-common.c
@@ -16,6 +16,7 @@
 #include <linux/io.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/of_address.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include "tsens.h"
@@ -126,11 +127,22 @@ static const struct regmap_config tsens_config = {
 int __init init_common(struct tsens_device *tmdev)
 {
         void __iomem *base;
+        struct platform_device *op = of_find_device_by_node(tmdev->dev->of_node);
 
+        if (!op)
+                return -EINVAL;
         base = of_iomap(tmdev->dev->of_node, 0);
         if (!base)
                 return -EINVAL;
 
+        /* The driver only uses the TM register address space for now */
+        if (op->num_resources > 1) {
+                tmdev->tm_offset = 0;
+        } else {
+                /* old DTs where SROT and TM were in a contiguous 2K block */
+                tmdev->tm_offset = 0x1000;
+        }
+
         tmdev->map = devm_regmap_init_mmio(tmdev->dev, base, &tsens_config);
         if (IS_ERR(tmdev->map)) {
                 iounmap(base);
diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
index dc56e1e2a19e..d785b37b47d2 100644
--- a/drivers/thermal/qcom/tsens.h
+++ b/drivers/thermal/qcom/tsens.h
@@ -77,6 +77,7 @@ struct tsens_device {
         struct device                   *dev;
         u32                             num_sensors;
         struct regmap                   *map;
+        u32                             tm_offset;
         struct tsens_context            ctx;
         const struct tsens_ops          *ops;
         struct tsens_sensor             sensor[0];