@@ -233,6 +233,17 @@ 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
+ 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
@@ -41,6 +41,7 @@ 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
new file mode 100644
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2019 NXP.
+ */
+
+#include <linux/err.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/firmware/imx/types.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
+
+static struct imx_sc_ipc *thermal_ipc_handle;
+
+struct imx_sc_sensor {
+ struct thermal_zone_device *tzd;
+ u32 resource_id;
+};
+
+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;
+};
+
+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) {
+ dev_err(&sensor->tzd->device, "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, *child, *sensor_np;
+ struct imx_sc_sensor *sensor;
+ int ret;
+
+ ret = imx_scu_get_handle(&thermal_ipc_handle);
+ if (ret)
+ return ret;
+
+ np = of_find_node_by_name(NULL, "thermal-zones");
+ if (!np)
+ return -ENODEV;
+
+ sensor_np = of_node_get(pdev->dev.of_node);
+
+ for_each_available_child_of_node(np, child) {
+ sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
+ if (!sensor) {
+ of_node_put(sensor_np);
+ return -ENOMEM;
+ }
+
+ ret = thermal_zone_of_get_sensor_id(child,
+ sensor_np,
+ &sensor->resource_id);
+ if (ret < 0) {
+ 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,
+ sensor->resource_id,
+ 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(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 <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
+MODULE_LICENSE("GPL v2");