NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
system controller, the system controller is in charge of system
power, clock and thermal sensors etc. management, Linux kernel
has to communicate with system controller via MU (message unit)
IPC to get temperature from thermal sensors, this patch adds
binding doc for i.MX system controller thermal driver.
Signed-off-by: Anson Huang <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
---
Changes since V6:
- put "imx,sensor-resource-id" property in thermal zone nodes.
---
.../devicetree/bindings/arm/freescale/fsl,scu.txt | 27 ++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index 72d481c..ad96881 100644
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -122,6 +122,27 @@ RTC bindings based on SCU Message Protocol
Required properties:
- compatible: should be "fsl,imx8qxp-sc-rtc";
+Thermal bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+Required properties:
+- compatible : Must be "fsl,imx-sc-thermal";
+- tsens-num : Total number of thermal sensors supported;
+- #thermal-sensor-cells : Should be 1. See
+ Documentation/devicetree/bindings/thermal/thermal.txt
+ for a description.
+
+Required properties for thermal zone nodes:
+- imx,sensor-resource-id : This property should be defined in each thermal zone
+ of thermal-zones node, it passes each thermal zone's
+ resource id for thermal driver to get temperature via
+ SCU IPC.
+
+ For thermal zone nodes, please refer to below binding
+ doc for details:
+
+[1] Documentation/devicetree/bindings/thermal/thermal.txt
+
Example (imx8qxp):
-------------
lsio_mu1: mailbox@5d1c0000 {
@@ -168,6 +189,12 @@ firmware {
rtc: rtc {
compatible = "fsl,imx8qxp-sc-rtc";
};
+
+ tsens: thermal-sensor {
+ compatible = "fsl,imx8qxp-sc-thermal";
+ tsens-num = <1>;
+ #thermal-sensor-cells = <1>;
+ };
};
};
--
2.7.4
i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
inside, the system controller is in charge of controlling power,
clock and thermal sensors etc..
This patch adds i.MX system controller thermal driver support,
Linux kernel has to communicate with system controller via MU
(message unit) IPC to get each thermal sensor's temperature,
it supports multiple sensors which are passed from device tree,
please see the binding doc for details.
Signed-off-by: Anson Huang <[email protected]>
---
Changes since V6:
- use "fsl,imx-sc-thermal" compatible to make SC thermal driver more generic for other i.MX8 SoCs
with system controller inside.
---
drivers/thermal/Kconfig | 11 +++
drivers/thermal/Makefile | 1 +
drivers/thermal/imx_sc_thermal.c | 161 +++++++++++++++++++++++++++++++++++++++
3 files changed, 173 insertions(+)
create mode 100644 drivers/thermal/imx_sc_thermal.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 58bb7d7..fec0ef5 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -223,6 +223,17 @@ config IMX_THERMAL
cpufreq is used as the cooling device to throttle CPUs when the
passive trip is crossed.
+config IMX_SC_THERMAL
+ tristate "Temperature sensor driver for NXP i.MX SoCs with System Controller"
+ depends on (ARCH_MXC && IMX_SCU) || COMPILE_TEST
+ depends on OF
+ help
+ Support for Temperature Monitor (TEMPMON) found on NXP i.MX SoCs with
+ system controller inside, Linux kernel has to communicate with system
+ controller via MU (message unit) IPC to get temperature from thermal
+ sensor. It supports one critical trip point and one
+ passive trip point for each thermal sensor.
+
config MAX77620_THERMAL
tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
depends on MFD_MAX77620
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 486d682..4062627 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o
obj-$(CONFIG_TANGO_THERMAL) += tango_thermal.o
obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
+obj-$(CONFIG_IMX_SC_THERMAL) += imx_sc_thermal.o
obj-$(CONFIG_MAX77620_THERMAL) += max77620_thermal.o
obj-$(CONFIG_QORIQ_THERMAL) += qoriq_thermal.o
obj-$(CONFIG_DA9062_THERMAL) += da9062-thermal.o
diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
new file mode 100644
index 0000000..1a8b978
--- /dev/null
+++ b/drivers/thermal/imx_sc_thermal.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2019 NXP.
+ */
+
+#include <linux/err.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+#define IMX_SC_MISC_FUNC_GET_TEMP 13
+#define IMX_SC_C_TEMP 0
+
+static struct imx_sc_ipc *thermal_ipc_handle;
+
+struct imx_sc_sensor {
+ struct thermal_zone_device *tzd;
+ u32 resource_id;
+};
+
+struct imx_sc_thermal_data {
+ struct imx_sc_sensor *sensor;
+};
+
+struct req_get_temp {
+ u16 resource_id;
+ u8 type;
+} __packed;
+
+struct resp_get_temp {
+ u16 celsius;
+ u8 tenths;
+} __packed;
+
+struct imx_sc_msg_misc_get_temp {
+ struct imx_sc_rpc_msg hdr;
+ union {
+ struct req_get_temp req;
+ struct resp_get_temp resp;
+ } data;
+} __packed;
+
+static int imx_sc_thermal_get_temp(void *data, int *temp)
+{
+ struct imx_sc_msg_misc_get_temp msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ struct imx_sc_sensor *sensor = data;
+ int ret;
+
+ msg.data.req.resource_id = sensor->resource_id;
+ msg.data.req.type = IMX_SC_C_TEMP;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_MISC;
+ hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
+ hdr->size = 2;
+
+ ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
+ if (ret) {
+ pr_err("read temp sensor %d failed, ret %d\n",
+ sensor->resource_id, ret);
+ return ret;
+ }
+
+ *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
+
+ return 0;
+}
+
+static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
+ .get_temp = imx_sc_thermal_get_temp,
+};
+
+static int imx_sc_thermal_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *sensor_np = NULL;
+ struct imx_sc_thermal_data *data;
+ struct imx_sc_sensor *sensors;
+ u32 sensor_num;
+ int ret, i;
+
+ ret = imx_scu_get_handle(&thermal_ipc_handle);
+ if (ret)
+ return ret;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = of_property_read_u32(np, "tsens-num", &sensor_num);
+ if (ret || !sensor_num) {
+ dev_err(&pdev->dev, "failed to get valid temp sensor number!\n");
+ return -EINVAL;
+ }
+
+ sensors = devm_kzalloc(&pdev->dev, sizeof(*data->sensor) * sensor_num,
+ GFP_KERNEL);
+ if (!sensors)
+ return -ENOMEM;
+
+ data->sensor = sensors;
+
+ np = of_find_node_by_name(NULL, "thermal-zones");
+ if (!np)
+ return -ENODEV;
+
+ for (i = 0; i < sensor_num; i++) {
+ struct imx_sc_sensor *sensor = &data->sensor[i];
+
+ sensor_np = of_get_next_child(np, sensor_np);
+ ret = of_property_read_u32(sensor_np, "imx,sensor-resource-id",
+ &sensor->resource_id);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "failed to get valid sensor resource id: %d\n",
+ ret);
+ break;
+ }
+
+ sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
+ i,
+ sensor,
+ &imx_sc_thermal_ops);
+ if (IS_ERR(sensor->tzd)) {
+ dev_err(&pdev->dev, "failed to register thermal zone\n");
+ ret = PTR_ERR(sensor->tzd);
+ break;
+ }
+ }
+
+ of_node_put(np);
+ of_node_put(sensor_np);
+
+ return ret;
+}
+
+static const struct of_device_id imx_sc_thermal_table[] = {
+ { .compatible = "fsl,imx-sc-thermal", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
+
+static struct platform_driver imx_sc_thermal_driver = {
+ .probe = imx_sc_thermal_probe,
+ .driver = {
+ .name = "imx-sc-thermal",
+ .of_match_table = imx_sc_thermal_table,
+ },
+};
+module_platform_driver(imx_sc_thermal_driver);
+
+MODULE_AUTHOR("Anson Huang <[email protected]>");
+MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
+MODULE_LICENSE("GPL v2");
--
2.7.4
Add i.MX8QXP CPU thermal zone support.
Signed-off-by: Anson Huang <[email protected]>
---
Changes since V6:
- add fallback compatible string "fsl,imx-sc-thermal" according to i.MX SC thermal driver
update.
---
arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
index 4c3dd95..24b03d6 100644
--- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
@@ -10,6 +10,7 @@
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/pinctrl/pads-imx8qxp.h>
+#include <dt-bindings/thermal/thermal.h>
/ {
interrupt-parent = <&gic>;
@@ -116,6 +117,12 @@
rtc: rtc {
compatible = "fsl,imx8qxp-sc-rtc";
};
+
+ tsens: thermal-sensor {
+ compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
+ tsens-num = <1>;
+ #thermal-sensor-cells = <1>;
+ };
};
timer {
@@ -443,4 +450,25 @@
power-domains = <&pd IMX_SC_R_GPIO_7>;
};
};
+
+ thermal_zones: thermal-zones {
+ cpu-thermal0 {
+ polling-delay-passive = <250>;
+ polling-delay = <2000>;
+ thermal-sensors = <&tsens 0>;
+ imx,sensor-resource-id = <355>;
+ trips {
+ cpu_alert0: trip0 {
+ temperature = <107000>;
+ hysteresis = <2000>;
+ type = "passive";
+ };
+ cpu_crit0: trip1 {
+ temperature = <127000>;
+ hysteresis = <2000>;
+ type = "critical";
+ };
+ };
+ };
+ };
};
--
2.7.4
This patch enables CONFIG_IMX_SC_THERMAL as module.
Signed-off-by: Anson Huang <[email protected]>
---
No changes since V6.
---
arch/arm64/configs/defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 2d9c390..52d503e 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -413,6 +413,7 @@ CONFIG_SENSORS_INA2XX=m
CONFIG_THERMAL_GOV_POWER_ALLOCATOR=y
CONFIG_CPU_THERMAL=y
CONFIG_THERMAL_EMULATION=y
+CONFIG_IMX_SC_THERMAL=m
CONFIG_ROCKCHIP_THERMAL=m
CONFIG_RCAR_THERMAL=y
CONFIG_RCAR_GEN3_THERMAL=y
--
2.7.4
> From: Anson Huang
> Sent: Wednesday, February 20, 2019 2:54 PM
>
> NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as system
> controller, the system controller is in charge of system power, clock and
> thermal sensors etc. management, Linux kernel has to communicate with
> system controller via MU (message unit) IPC to get temperature from thermal
> sensors, this patch adds binding doc for i.MX system controller thermal driver.
>
> Signed-off-by: Anson Huang <[email protected]>
> Reviewed-by: Rob Herring <[email protected]>
> ---
> Changes since V6:
> - put "imx,sensor-resource-id" property in thermal zone nodes.
> ---
> .../devicetree/bindings/arm/freescale/fsl,scu.txt | 27
> ++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> index 72d481c..ad96881 100644
> --- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> @@ -122,6 +122,27 @@ RTC bindings based on SCU Message Protocol
> Required properties:
> - compatible: should be "fsl,imx8qxp-sc-rtc";
>
> +Thermal bindings based on SCU Message Protocol
> +------------------------------------------------------------
> +
> +Required properties:
> +- compatible : Must be "fsl,imx-sc-thermal";
> +- tsens-num : Total number of thermal sensors supported;
We properly don't need this property if the number of sensor
is fixed on a specific SoC.
> +- #thermal-sensor-cells : Should be 1. See
> + Documentation/devicetree/bindings/thermal/thermal.txt
> + for a description.
> +
> +Required properties for thermal zone nodes:
> +- imx,sensor-resource-id : This property should be defined in each thermal
After a further looking at it, I wonder this property may not needed either.
> zone
> + of thermal-zones node, it passes each thermal zone's
> + resource id for thermal driver to get temperature via
> + SCU IPC.
> +
> + For thermal zone nodes, please refer to below binding
> + doc for details:
> +
> +[1] Documentation/devicetree/bindings/thermal/thermal.txt
> +
> Example (imx8qxp):
> -------------
> lsio_mu1: mailbox@5d1c0000 {
> @@ -168,6 +189,12 @@ firmware {
> rtc: rtc {
> compatible = "fsl,imx8qxp-sc-rtc";
> };
> +
> + tsens: thermal-sensor {
> + compatible = "fsl,imx8qxp-sc-thermal";
> + tsens-num = <1>;
> + #thermal-sensor-cells = <1>;
This looks may not correct if sensor cells is 1 but the sensor number
Is also 1.
So we probably better remove tsens-num property.
Regards
Dong Aisheng
> + };
> };
> };
>
> --
> 2.7.4
Best Regards!
Anson Huang
> -----Original Message-----
> From: Aisheng Dong
> Sent: 2019??2??20?? 15:45
> To: Anson Huang <[email protected]>; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; Daniel Baluta <[email protected]>;
> [email protected]; Andy Gross <[email protected]>;
> [email protected]; [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]; linux-arm-
> [email protected]; [email protected]
> Cc: dl-linux-imx <[email protected]>
> Subject: RE: [PATCH V7 1/4] dt-bindings: fsl: scu: add thermal binding
>
> > From: Anson Huang
> > Sent: Wednesday, February 20, 2019 2:54 PM
> >
> > NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as system
> > controller, the system controller is in charge of system power, clock
> > and thermal sensors etc. management, Linux kernel has to communicate
> > with system controller via MU (message unit) IPC to get temperature
> > from thermal sensors, this patch adds binding doc for i.MX system
> controller thermal driver.
> >
> > Signed-off-by: Anson Huang <[email protected]>
> > Reviewed-by: Rob Herring <[email protected]>
> > ---
> > Changes since V6:
> > - put "imx,sensor-resource-id" property in thermal zone nodes.
> > ---
> > .../devicetree/bindings/arm/freescale/fsl,scu.txt | 27
> > ++++++++++++++++++++++
> > 1 file changed, 27 insertions(+)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> > b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> > index 72d481c..ad96881 100644
> > --- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> > +++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
> > @@ -122,6 +122,27 @@ RTC bindings based on SCU Message Protocol
> > Required properties:
> > - compatible: should be "fsl,imx8qxp-sc-rtc";
> >
> > +Thermal bindings based on SCU Message Protocol
> > +------------------------------------------------------------
> > +
> > +Required properties:
> > +- compatible : Must be "fsl,imx-sc-thermal";
> > +- tsens-num : Total number of thermal sensors supported;
>
> We properly don't need this property if the number of sensor is fixed on a
> specific SoC.
After further check, I think we can use " for_each_available_child_of_node "
to get every thermal zone's HW resource ID and remove this property.
>
> > +- #thermal-sensor-cells : Should be 1. See
> > +
> Documentation/devicetree/bindings/thermal/thermal.txt
> > + for a description.
> > +
> > +Required properties for thermal zone nodes:
> > +- imx,sensor-resource-id : This property should be defined in each
> > +thermal
>
> After a further looking at it, I wonder this property may not needed either.
>
If we do NOT have such property, we have to do the mapping in driver to get
resource ID, for different SoC, we will have to create different mapping table,
the thermal zone ID given by common thermal framework is virtual ID starting
from 0. Adding this property in thermal zone node is to make SC thermal driver
more generic for other SoCs.
> > zone
> > + of thermal-zones node, it passes each thermal
> zone's
> > + resource id for thermal driver to get temperature
> via
> > + SCU IPC.
> > +
> > + For thermal zone nodes, please refer to below
> binding
> > + doc for details:
> > +
> > +[1] Documentation/devicetree/bindings/thermal/thermal.txt
> > +
> > Example (imx8qxp):
> > -------------
> > lsio_mu1: mailbox@5d1c0000 {
> > @@ -168,6 +189,12 @@ firmware {
> > rtc: rtc {
> > compatible = "fsl,imx8qxp-sc-rtc";
> > };
> > +
> > + tsens: thermal-sensor {
> > + compatible = "fsl,imx8qxp-sc-thermal";
> > + tsens-num = <1>;
> > + #thermal-sensor-cells = <1>;
>
> This looks may not correct if sensor cells is 1 but the sensor number Is also 1.
> So we probably better remove tsens-num property.
Yes, this should be 0 if 1 thermal zone ONLY have 1 thermal sensor, later we will
add other thermal zone like DDR zone, currently there is still some issues so SCFW
does NOT provide support for this zone, after issue fixed, SCFW may add this thermal
zone's support. Will fix them in next version.
Thanks,
Anson.
>
> Regards
> Dong Aisheng
>
> > + };
> > };
> > };
> >
> > --
> > 2.7.4
On Wed, Feb 20, 2019 at 06:53:58AM +0000, Anson Huang wrote:
> Add i.MX8QXP CPU thermal zone support.
>
> Signed-off-by: Anson Huang <[email protected]>
> ---
> Changes since V6:
> - add fallback compatible string "fsl,imx-sc-thermal" according to i.MX SC thermal driver
> update.
> ---
> arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> index 4c3dd95..24b03d6 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> @@ -10,6 +10,7 @@
> #include <dt-bindings/gpio/gpio.h>
> #include <dt-bindings/interrupt-controller/arm-gic.h>
> #include <dt-bindings/pinctrl/pads-imx8qxp.h>
> +#include <dt-bindings/thermal/thermal.h>
>
> / {
> interrupt-parent = <&gic>;
> @@ -116,6 +117,12 @@
> rtc: rtc {
> compatible = "fsl,imx8qxp-sc-rtc";
> };
> +
> + tsens: thermal-sensor {
> + compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
> + tsens-num = <1>;
> + #thermal-sensor-cells = <1>;
> + };
> };
>
> timer {
> @@ -443,4 +450,25 @@
> power-domains = <&pd IMX_SC_R_GPIO_7>;
> };
> };
> +
> + thermal_zones: thermal-zones {
> + cpu-thermal0 {
> + polling-delay-passive = <250>;
> + polling-delay = <2000>;
> + thermal-sensors = <&tsens 0>;
> + imx,sensor-resource-id = <355>;
> + trips {
> + cpu_alert0: trip0 {
> + temperature = <107000>;
> + hysteresis = <2000>;
> + type = "passive";
Please add your cooling maps for a passive trip point.
> + };
> + cpu_crit0: trip1 {
> + temperature = <127000>;
> + hysteresis = <2000>;
> + type = "critical";
> + };
> + };
> + };
> + };
> };
> --
> 2.7.4
>
On Wed, Feb 20, 2019 at 06:53:40AM +0000, Anson Huang wrote:
> i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
> inside, the system controller is in charge of controlling power,
> clock and thermal sensors etc..
>
> This patch adds i.MX system controller thermal driver support,
> Linux kernel has to communicate with system controller via MU
> (message unit) IPC to get each thermal sensor's temperature,
> it supports multiple sensors which are passed from device tree,
> please see the binding doc for details.
>
> Signed-off-by: Anson Huang <[email protected]>
> ---
> Changes since V6:
> - use "fsl,imx-sc-thermal" compatible to make SC thermal driver more generic for other i.MX8 SoCs
> with system controller inside.
> ---
> drivers/thermal/Kconfig | 11 +++
> drivers/thermal/Makefile | 1 +
> drivers/thermal/imx_sc_thermal.c | 161 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 173 insertions(+)
> create mode 100644 drivers/thermal/imx_sc_thermal.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 58bb7d7..fec0ef5 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -223,6 +223,17 @@ config IMX_THERMAL
> cpufreq is used as the cooling device to throttle CPUs when the
> passive trip is crossed.
>
> +config IMX_SC_THERMAL
> + tristate "Temperature sensor driver for NXP i.MX SoCs with System Controller"
> + depends on (ARCH_MXC && IMX_SCU) || COMPILE_TEST
> + depends on OF
> + help
> + Support for Temperature Monitor (TEMPMON) found on NXP i.MX SoCs with
> + system controller inside, Linux kernel has to communicate with system
> + controller via MU (message unit) IPC to get temperature from thermal
> + sensor. It supports one critical trip point and one
> + passive trip point for each thermal sensor.
> +
> config MAX77620_THERMAL
> tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
> depends on MFD_MAX77620
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 486d682..4062627 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -40,6 +40,7 @@ obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
> obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o
> obj-$(CONFIG_TANGO_THERMAL) += tango_thermal.o
> obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
> +obj-$(CONFIG_IMX_SC_THERMAL) += imx_sc_thermal.o
> obj-$(CONFIG_MAX77620_THERMAL) += max77620_thermal.o
> obj-$(CONFIG_QORIQ_THERMAL) += qoriq_thermal.o
> obj-$(CONFIG_DA9062_THERMAL) += da9062-thermal.o
> diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
> new file mode 100644
> index 0000000..1a8b978
> --- /dev/null
> +++ b/drivers/thermal/imx_sc_thermal.c
> @@ -0,0 +1,161 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2018-2019 NXP.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/firmware/imx/sci.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/thermal.h>
> +
> +#include "thermal_core.h"
> +
> +#define IMX_SC_MISC_FUNC_GET_TEMP 13
> +#define IMX_SC_C_TEMP 0
> +
> +static struct imx_sc_ipc *thermal_ipc_handle;
> +
> +struct imx_sc_sensor {
> + struct thermal_zone_device *tzd;
> + u32 resource_id;
> +};
> +
> +struct imx_sc_thermal_data {
> + struct imx_sc_sensor *sensor;
> +};
> +
> +struct req_get_temp {
> + u16 resource_id;
> + u8 type;
> +} __packed;
> +
> +struct resp_get_temp {
> + u16 celsius;
> + u8 tenths;
> +} __packed;
> +
> +struct imx_sc_msg_misc_get_temp {
> + struct imx_sc_rpc_msg hdr;
> + union {
> + struct req_get_temp req;
> + struct resp_get_temp resp;
> + } data;
> +} __packed;
> +
> +static int imx_sc_thermal_get_temp(void *data, int *temp)
> +{
> + struct imx_sc_msg_misc_get_temp msg;
> + struct imx_sc_rpc_msg *hdr = &msg.hdr;
> + struct imx_sc_sensor *sensor = data;
> + int ret;
> +
> + msg.data.req.resource_id = sensor->resource_id;
> + msg.data.req.type = IMX_SC_C_TEMP;
> +
> + hdr->ver = IMX_SC_RPC_VERSION;
> + hdr->svc = IMX_SC_RPC_SVC_MISC;
> + hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
> + hdr->size = 2;
> +
> + ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
> + if (ret) {
> + pr_err("read temp sensor %d failed, ret %d\n",
> + sensor->resource_id, ret);
> + return ret;
> + }
> +
> + *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
> +
> + return 0;
> +}
> +
> +static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
> + .get_temp = imx_sc_thermal_get_temp,
> +};
> +
> +static int imx_sc_thermal_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct device_node *sensor_np = NULL;
> + struct imx_sc_thermal_data *data;
> + struct imx_sc_sensor *sensors;
> + u32 sensor_num;
> + int ret, i;
> +
> + ret = imx_scu_get_handle(&thermal_ipc_handle);
> + if (ret)
> + return ret;
> +
> + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + ret = of_property_read_u32(np, "tsens-num", &sensor_num);
> + if (ret || !sensor_num) {
> + dev_err(&pdev->dev, "failed to get valid temp sensor number!\n");
> + return -EINVAL;
> + }
> +
> + sensors = devm_kzalloc(&pdev->dev, sizeof(*data->sensor) * sensor_num,
> + GFP_KERNEL);
> + if (!sensors)
> + return -ENOMEM;
> +
> + data->sensor = sensors;
> +
> + np = of_find_node_by_name(NULL, "thermal-zones");
> + if (!np)
> + return -ENODEV;
> +
> + for (i = 0; i < sensor_num; i++) {
> + struct imx_sc_sensor *sensor = &data->sensor[i];
> +
> + sensor_np = of_get_next_child(np, sensor_np);
> + ret = of_property_read_u32(sensor_np, "imx,sensor-resource-id",
I think the idea here is to have imx,sensor-resource-id part of the
tsens node, not part of the thermal-zone node.
> + &sensor->resource_id);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "failed to get valid sensor resource id: %d\n",
> + ret);
> + break;
> + }
> +
> + sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
> + i,
> + sensor,
> + &imx_sc_thermal_ops);
> + if (IS_ERR(sensor->tzd)) {
> + dev_err(&pdev->dev, "failed to register thermal zone\n");
> + ret = PTR_ERR(sensor->tzd);
> + break;
> + }
> + }
> +
> + of_node_put(np);
> + of_node_put(sensor_np);
> +
> + return ret;
> +}
> +
> +static const struct of_device_id imx_sc_thermal_table[] = {
> + { .compatible = "fsl,imx-sc-thermal", },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
> +
> +static struct platform_driver imx_sc_thermal_driver = {
> + .probe = imx_sc_thermal_probe,
> + .driver = {
> + .name = "imx-sc-thermal",
> + .of_match_table = imx_sc_thermal_table,
> + },
> +};
> +module_platform_driver(imx_sc_thermal_driver);
> +
> +MODULE_AUTHOR("Anson Huang <[email protected]>");
> +MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>