[PATCH] thermal: amlogic: Add hwmon support

[Martin Blumenstingl]

Many monitoring tools read the CPU temperature using the hwmon
interface. Expose the thermal sensors on Amlogic boards as hwmon
devices.

Without this lm_sensors' "sensors" tool does not find any temperature
sensors. Now it prints:
  cpu_thermal-virtual-0
  Adapter: Virtual device
  temp1:        +44.7 C  (crit = +110.0 C)

  ddr_thermal-virtual-0
  Adapter: Virtual device
  temp1:        +45.9 C  (crit = +110.0 C)

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
 drivers/thermal/amlogic_thermal.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/thermal/amlogic_thermal.c b/drivers/thermal/amlogic_thermal.c
index ccb1fe18e993..dffe3ba8c7c4 100644
--- a/drivers/thermal/amlogic_thermal.c
+++ b/drivers/thermal/amlogic_thermal.c
@@ -29,6 +29,7 @@
 #include <linux/thermal.h>
 
 #include "thermal_core.h"
+#include "thermal_hwmon.h"
 
 #define TSENSOR_CFG_REG1			0x4
 	#define TSENSOR_CFG_REG1_RSET_VBG	BIT(12)
@@ -287,6 +288,9 @@ static int amlogic_thermal_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	if (devm_thermal_add_hwmon_sysfs(pdata->tzd))
+		dev_warn(&pdev->dev, "Failed to add hwmon sysfs attributes\n");
+
 	ret = amlogic_thermal_initialize(pdata);
 	if (ret)
 		return ret;
-- 
2.29.2