thermal: add i.MX8 thermal driver

Add i.MX8 thermal driver to support get temperature from SCU.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

drivers/thermal/Kconfig

@@ -17,6 +17,15 @@ config IMX_THERMAL
           cpufreq is used as the cooling device to throttle CPUs when the
           passive trip is crossed.
 
+config IMX_SCU_THERMAL
+	bool "Temperature sensor driver for NXP i.MX8"
+	depends on ARCH_IMX8
+	help
+	  Support for Temperature sensors on NXP i.MX8.
+	  It supports one critical trip point and one passive trip point. The
+	  boot is hold to the cool device to throttle CPUs when the passive
+	  trip is crossed
+
 config TI_DRA7_THERMAL
         bool "Temperature sensor driver for TI dra7xx SOCs"
         help

drivers/thermal/Makefile

@@ -5,4 +5,5 @@
 
 obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o
 obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o
+obj-$(CONFIG_IMX_SCU_THERMAL) += imx_scu_thermal.o
 obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o

drivers/thermal/imx_scu_thermal.c

@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 NXP
+ */
+
+#include <config.h>
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <thermal.h>
+#include <dm/device-internal.h>
+#include <dm/device.h>
+#include <asm/arch/sci/sci.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct imx_sc_thermal_plat {
+	int critical;
+	int alert;
+	int polling_delay;
+	int id;
+	bool zone_node;
+};
+
+static int read_temperature(struct udevice *dev, int *temp)
+{
+	s16 celsius;
+	s8 tenths;
+	int ret;
+
+	sc_rsrc_t *sensor_rsrc = (sc_rsrc_t *)dev_get_driver_data(dev);
+
+	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
+
+	if (!temp)
+		return -EINVAL;
+
+	ret = sc_misc_get_temp(-1, sensor_rsrc[pdata->id], SC_C_TEMP,
+			       &celsius, &tenths);
+	if (ret) {
+		printf("Error: get temperature failed! (error = %d)\n", ret);
+		return ret;
+	}
+
+	*temp = celsius * 1000 + tenths * 100;
+
+	return 0;
+}
+
+int imx_sc_thermal_get_temp(struct udevice *dev, int *temp)
+{
+	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
+	int cpu_temp = 0;
+	int ret;
+
+	ret = read_temperature(dev, &cpu_temp);
+	if (ret)
+		return ret;
+
+	while (cpu_temp >= pdata->alert) {
+		printf("CPU Temperature (%dC) has beyond alert (%dC), close to critical (%dC)",
+		       cpu_temp, pdata->alert, pdata->critical);
+		puts(" waiting...\n");
+		mdelay(pdata->polling_delay);
+		ret = read_temperature(dev, &cpu_temp);
+		if (ret)
+			return ret;
+	}
+
+	*temp = cpu_temp / 1000;
+
+	return 0;
+}
+
+static const struct dm_thermal_ops imx_sc_thermal_ops = {
+	.get_temp	= imx_sc_thermal_get_temp,
+};
+
+static int imx_sc_thermal_probe(struct udevice *dev)
+{
+	debug("%s dev name %s\n", __func__, dev->name);
+	return 0;
+}
+
+static int imx_sc_thermal_bind(struct udevice *dev)
+{
+	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
+	int reg, ret;
+	int offset;
+	const char *name;
+	const void *prop;
+
+	debug("%s dev name %s\n", __func__, dev->name);
+
+	prop = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "compatible",
+			   NULL);
+	if (!prop)
+		return 0;
+
+	pdata->zone_node = 1;
+
+	reg = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "tsens-num", 0);
+	if (reg == 0) {
+		printf("%s: no temp sensor number provided!\n", __func__);
+		return -EINVAL;
+	}
+
+	offset = fdt_subnode_offset(gd->fdt_blob, 0, "thermal-zones");
+	fdt_for_each_subnode(offset, gd->fdt_blob, offset) {
+		/* Bind the subnode to this driver */
+		name = fdt_get_name(gd->fdt_blob, offset, NULL);
+
+		ret = device_bind_with_driver_data(dev, dev->driver, name,
+						   dev->driver_data,
+						   offset_to_ofnode(offset),
+						   NULL);
+		if (ret)
+			printf("Error binding driver '%s': %d\n",
+			       dev->driver->name, ret);
+	}
+	return 0;
+}
+
+static int imx_sc_thermal_ofdata_to_platdata(struct udevice *dev)
+{
+	struct imx_sc_thermal_plat *pdata = dev_get_platdata(dev);
+	struct fdtdec_phandle_args args;
+	const char *type;
+	int ret;
+	int trips_np;
+
+	debug("%s dev name %s\n", __func__, dev->name);
+
+	if (pdata->zone_node)
+		return 0;
+
+	ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
+					     "thermal-sensors",
+					     "#thermal-sensor-cells",
+					     0, 0, &args);
+	if (ret)
+		return ret;
+
+	if (args.node != dev_of_offset(dev->parent))
+		return -EFAULT;
+
+	if (args.args_count >= 1)
+		pdata->id = args.args[0];
+	else
+		pdata->id = 0;
+
+	debug("args.args_count %d, id %d\n", args.args_count, pdata->id);
+
+	pdata->polling_delay = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
+					      "polling-delay", 1000);
+
+	trips_np = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev),
+				      "trips");
+	fdt_for_each_subnode(trips_np, gd->fdt_blob, trips_np) {
+		type = fdt_getprop(gd->fdt_blob, trips_np, "type", NULL);
+		if (type) {
+			if (strcmp(type, "critical") == 0) {
+				pdata->critical = fdtdec_get_int(gd->fdt_blob,
+								 trips_np,
+								 "temperature",
+								 85);
+			} else if (strcmp(type, "passive") == 0) {
+				pdata->alert = fdtdec_get_int(gd->fdt_blob,
+							      trips_np,
+							      "temperature",
+							      80);
+			}
+		}
+	}
+
+	debug("id %d polling_delay %d, critical %d, alert %d\n", pdata->id,
+	      pdata->polling_delay, pdata->critical, pdata->alert);
+
+	return 0;
+}
+
+static const sc_rsrc_t imx8qxp_sensor_rsrc[] = {
+	SC_R_SYSTEM, SC_R_DRC_0, SC_R_PMIC_0,
+	SC_R_PMIC_1, SC_R_PMIC_2,
+};
+
+static const struct udevice_id imx_sc_thermal_ids[] = {
+	{ .compatible = "nxp,imx8qxp-sc-tsens", .data =
+		(ulong)&imx8qxp_sensor_rsrc, },
+	{ }
+};
+
+U_BOOT_DRIVER(imx_sc_thermal) = {
+	.name	= "imx_sc_thermal",
+	.id	= UCLASS_THERMAL,
+	.ops	= &imx_sc_thermal_ops,
+	.of_match = imx_sc_thermal_ids,
+	.bind = imx_sc_thermal_bind,
+	.probe	= imx_sc_thermal_probe,
+	.ofdata_to_platdata = imx_sc_thermal_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct imx_sc_thermal_plat),
+	.flags  = DM_FLAG_PRE_RELOC,
+};