thermal: imx_sc: add i.MX system controller thermal support (e20db70d) · Commits · 戴 / test

drivers/thermal/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -251,6 +251,17 @@ 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 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

drivers/thermal/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -43,6 +43,7 @@ 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

drivers/thermal/imx_sc_thermal.c

0 → 100644

+148 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0+
		/*
		* Copyright 2018-2020 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 int imx_sc_thermal_remove(struct platform_device *pdev)
		{
		return 0;
		}

		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,
		.remove = imx_sc_thermal_remove,
		.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");

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