From: Fabio Estevam <festevam@xxxxxxx>
Currently, after the SoC reaches the critical temperature, the board
goes through a poweroff mechanism.
In some cases, such behavior does not suit well, as the board may be
unattended in the field and rebooting may be a better approach.
The bootloader may also check the temperature and only allow the boot to
proceed when the temperature is below a certain threshold.
Introduce the 'nxp,reboot-on-critical' property to indicate that the
board will go through a reboot after the critical temperature is reached.
When this property is absent, the default behavior of forcing a shutdown
is kept.
Tested on a imx8mm-evk board.
Signed-off-by: Fabio Estevam <festevam@xxxxxxx>
---
Changes since v4:
- Went back to the devicetree approach.
- Populate tmu_tz_ops.critical inside probe (Daniel).
Changes since v3:
- Switch to sysfs.
Changes since v2:
- Populate tmu_tz_ops.critical inside probe (Daniel).
Changes since v1:
- Use module_param().
drivers/thermal/imx8mm_thermal.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c
index e89b11b3f2b9..0ca3cba33f39 100644
--- a/drivers/thermal/imx8mm_thermal.c
+++ b/drivers/thermal/imx8mm_thermal.c
@@ -13,6 +13,7 @@
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/thermal.h>
@@ -146,7 +147,7 @@ static int tmu_get_temp(struct thermal_zone_device *tz, int *temp)
return tmu->socdata->get_temp(sensor, temp);
}
-static const struct thermal_zone_device_ops tmu_tz_ops = {
+static struct thermal_zone_device_ops tmu_tz_ops = {
.get_temp = tmu_get_temp,
};
@@ -293,6 +294,13 @@ static int imx8mm_tmu_probe_set_calib(struct platform_device *pdev,
return imx8mm_tmu_probe_set_calib_v2(pdev, tmu);
}
+static void tmu_critical(struct thermal_zone_device *tz)
+{
+ dev_emerg(thermal_zone_device(tz), "%s: critical temperature reached\n",
+ thermal_zone_device_type(tz));
+ kernel_restart(NULL);
+}
+
static int imx8mm_tmu_probe(struct platform_device *pdev)
{
const struct thermal_soc_data *data;
@@ -313,6 +321,9 @@ static int imx8mm_tmu_probe(struct platform_device *pdev)
if (IS_ERR(tmu->base))
return PTR_ERR(tmu->base);
+ if (of_property_present(pdev->dev.of_node, "nxp,reboot-on-critical"))
+ tmu_tz_ops.critical = tmu_critical;
+
tmu->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(tmu->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(tmu->clk),
--
2.34.1
