realtek: thermal driver for rtl838x and rtl930x SoCs

Add simple driver reading the internal temperature sensor.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Link: https://github.com/openwrt/openwrt/pull/17967
Signed-off-by: Sander Vanheule <sander@svanheule.net>

diff --git a/target/linux/realtek/dts/rtl838x.dtsi b/target/linux/realtek/dts/rtl838x.dtsi
index 18da4c9380046155afb51843c777a76e86f37e8c..abce9500fee70f7f202c05be80c38345d483e9fe 100644 (file)
--- a/target/linux/realtek/dts/rtl838x.dtsi
+++ b/target/linux/realtek/dts/rtl838x.dtsi
@@ -264,6 +264,11 @@
                        pinctrl-names = "default";
                        pinctrl-0 = <&mdio_aux_mdx>, <&aux_mode_mdio>;
                };
+
+               soc_thermal: thermal {
+                       compatible = "realtek,rtl8380-thermal";
+                       #thermal-sensor-cells = <0>;
+               };
        };
 
        pinmux@1b000144 {
@@ -364,4 +369,20 @@
                interrupt-parent = <&intc>;
                interrupts = <20 2>;
        };
+
+       thermal_zones: thermal-zones {
+               cpu-thermal {
+                       polling-delay-passive = <1000>;
+                       polling-delay = <1000>;
+                       coefficients = <1000 0>;
+                       thermal-sensors = <&soc_thermal>;
+                       trips {
+                               cpu-crit {
+                                       temperature = <105000>;
+                                       hysteresis = <2000>;
+                                       type = "critical";
+                               };
+                       };
+               };
+       };
 };

diff --git a/target/linux/realtek/dts/rtl930x.dtsi b/target/linux/realtek/dts/rtl930x.dtsi
index 94b755aeee3782b3ac7f02337e9210cb3d02e854..34d1ede54c9e6c19c1b4c72388c6935f123af7c9 100644 (file)
--- a/target/linux/realtek/dts/rtl930x.dtsi
+++ b/target/linux/realtek/dts/rtl930x.dtsi
@@ -156,6 +156,11 @@
 
                        status = "disabled";
                };
+
+               soc_thermal: thermal {
+                       compatible = "realtek,rtl9300-thermal";
+                       #thermal-sensor-cells = <0>;
+               };
        };
 
        pinmux@1b00c600 {
@@ -209,4 +214,20 @@
                interrupt-parent = <&intc>;
                interrupts = <23 2>;
        };
+
+       thermal_zones: thermal-zones {
+               cpu-thermal {
+                       polling-delay-passive = <1000>;
+                       polling-delay = <1000>;
+                       coefficients = <1000 0>;
+                       thermal-sensors = <&soc_thermal>;
+                       trips {
+                               critical {
+                                       temperature = <105000>;
+                                       hysteresis = <2000>;
+                                       type = "critical";
+                               };
+                       };
+               };
+       };
 };

diff --git a/target/linux/realtek/files-6.6/drivers/thermal/realtek-thermal.c b/target/linux/realtek/files-6.6/drivers/thermal/realtek-thermal.c
new file mode 100644 (file)
index 0000000..242f11b
--- /dev/null
+++ b/target/linux/realtek/files-6.6/drivers/thermal/realtek-thermal.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Realtek thermal sensor driver
+ *
+ * Copyright (C) 2025 Bjørn Mork <bjorn@mork.no>>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include "thermal_hwmon.h"
+
+#define RTL8380_THERMAL_METER_CTRL0    0x98
+#define RTL8380_THERMAL_METER_CTRL1    0x9c
+#define RTL8380_THERMAL_METER_CTRL2    0xa0
+#define RTL8380_THERMAL_METER_RESULT   0xa4
+#define RTL8380_TM_ENABLE              BIT(0)
+#define RTL8380_TEMP_VALID             BIT(8)
+#define RTL8380_TEMP_OUT_MASK          GENMASK(6, 0)
+
+#define RTL9300_THERMAL_METER_CTRL0    0x60
+#define RTL9300_THERMAL_METER_CTRL1    0x64
+#define RTL9300_THERMAL_METER_CTRL2    0x68
+#define RTL9300_THERMAL_METER_RESULT0  0x6c
+#define RTL9300_THERMAL_METER_RESULT1  0x70
+#define RTL9300_TM_ENABLE              BIT(16)
+#define RTL9300_TEMP_VALID             BIT(24)
+#define RTL9300_TEMP_OUT_MASK          GENMASK(23, 16)
+#define RTL9300_SAMPLE_DLY_SHIFT       (16)
+#define RTL9300_SAMPLE_DLY_MASK                GENMASK(RTL9300_SAMPLE_DLY_SHIFT + 15, RTL9300_SAMPLE_DLY_SHIFT)
+#define RTL9300_COMPARE_DLY_SHIFT      (0)
+#define RTL9300_COMPARE_DLY_MASK               GENMASK(RTL9300_COMPARE_DLY_SHIFT + 15, RTL9300_COMPARE_DLY_SHIFT)
+
+struct realtek_thermal_priv {
+       struct regmap *regmap;
+       bool enabled;
+};
+
+static void rtl8380_thermal_init(struct realtek_thermal_priv *priv)
+{
+       priv->enabled = !regmap_update_bits(priv->regmap, RTL8380_THERMAL_METER_CTRL0, RTL8380_TM_ENABLE, RTL8380_TM_ENABLE);
+}
+
+static int rtl8380_get_temp(struct thermal_zone_device *tz, int *res)
+{
+       struct realtek_thermal_priv *priv = thermal_zone_device_priv(tz);
+       int offset = thermal_zone_get_offset(tz);
+       int slope = thermal_zone_get_slope(tz);
+       u32 val;
+       int ret;
+
+       if (!priv->enabled)
+               rtl8380_thermal_init(priv);
+
+       ret = regmap_read(priv->regmap, RTL8380_THERMAL_METER_RESULT, &val);
+       if (ret)
+               return ret;
+
+       if (!(val & RTL8380_TEMP_VALID))
+               return -EAGAIN;
+
+       *res = FIELD_GET(RTL8380_TEMP_OUT_MASK, val) * slope + offset;
+       return 0;
+}
+
+static const struct thermal_zone_device_ops rtl8380_ops = {
+       .get_temp = rtl8380_get_temp,
+};
+
+static void rtl9300_thermal_init(struct realtek_thermal_priv *priv)
+{
+       /* increasing sample delay makes get_temp() succeed more often */
+       regmap_update_bits(priv->regmap, RTL9300_THERMAL_METER_CTRL1, RTL9300_SAMPLE_DLY_MASK, 0x0800 << RTL9300_SAMPLE_DLY_SHIFT);
+       priv->enabled = !regmap_update_bits(priv->regmap, RTL9300_THERMAL_METER_CTRL2, RTL9300_TM_ENABLE, RTL9300_TM_ENABLE);
+}
+
+static int rtl9300_get_temp(struct thermal_zone_device *tz, int *res)
+{
+       struct realtek_thermal_priv *priv = thermal_zone_device_priv(tz);
+       int offset = thermal_zone_get_offset(tz);
+       int slope = thermal_zone_get_slope(tz);
+       u32 val;
+       int ret;
+
+       if (!priv->enabled)
+               rtl9300_thermal_init(priv);
+
+       ret = regmap_read(priv->regmap, RTL9300_THERMAL_METER_RESULT0, &val);
+       if (ret)
+               return ret;
+       if (!(val & RTL9300_TEMP_VALID))
+               return -EAGAIN;
+
+       *res = FIELD_GET(RTL9300_TEMP_OUT_MASK, val) * slope + offset;
+       return 0;
+}
+
+static const struct thermal_zone_device_ops rtl9300_ops = {
+       .get_temp = rtl9300_get_temp,
+};
+
+static int realtek_thermal_probe(struct platform_device *pdev)
+{
+       struct realtek_thermal_priv *priv;
+       struct thermal_zone_device *tzdev;
+       struct device *dev = &pdev->dev;
+       struct regmap *regmap;
+
+       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       regmap = syscon_node_to_regmap(dev->of_node->parent);
+       if (IS_ERR(regmap))
+               return PTR_ERR(regmap);
+
+       priv->regmap = regmap;
+       tzdev = devm_thermal_of_zone_register(dev, 0, priv, device_get_match_data(dev));
+       if (IS_ERR(tzdev))
+               return PTR_ERR(tzdev);
+
+       return devm_thermal_add_hwmon_sysfs(dev, tzdev);
+}
+
+static const struct of_device_id realtek_sensor_ids[] = {
+       { .compatible = "realtek,rtl8380-thermal", .data = &rtl8380_ops, },
+       { .compatible = "realtek,rtl9300-thermal", .data = &rtl9300_ops, },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, realtek_sensor_ids);
+
+static struct platform_driver realtek_thermal_driver = {
+       .probe  = realtek_thermal_probe,
+       .driver = {
+               .name           = "realtek-thermal",
+               .of_match_table = realtek_sensor_ids,
+       },
+};
+
+module_platform_driver(realtek_thermal_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
+MODULE_DESCRIPTION("Realtek temperature sensor");

diff --git a/target/linux/realtek/patches-6.6/330-add-realtek-thernal-driver.patch b/target/linux/realtek/patches-6.6/330-add-realtek-thernal-driver.patch
new file mode 100644 (file)
index 0000000..0c8d4ab
--- /dev/null
+++ b/target/linux/realtek/patches-6.6/330-add-realtek-thernal-driver.patch
@@ -0,0 +1,21 @@
+--- a/drivers/thermal/Kconfig
++++ b/drivers/thermal/Kconfig
+@@ -522,4 +522,11 @@ config LOONGSON2_THERMAL
+         is higher than the high temperature threshold or lower than the low
+         temperature threshold, the interrupt will occur.
+ 
++config REALTEK_THERMAL
++      tristate "Realtek RTL838x and RTL930x thermal sensor support"
++      depends on RTL838X || RTL930X || COMPILE_TEST
++      depends on THERMAL_OF
++      help
++        Support thermal sensor in Realtek RTL838x and RTL930x SoCs
++
+ endif
+--- a/drivers/thermal/Makefile
++++ b/drivers/thermal/Makefile
+@@ -64,3 +64,4 @@ obj-$(CONFIG_AMLOGIC_THERMAL)     += aml
+ obj-$(CONFIG_SPRD_THERMAL)    += sprd_thermal.o
+ obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL)  += khadas_mcu_fan.o
+ obj-$(CONFIG_LOONGSON2_THERMAL)       += loongson2_thermal.o
++obj-$(CONFIG_REALTEK_THERMAL) += realtek-thermal.o

diff --git a/target/linux/realtek/rtl838x/config-6.6 b/target/linux/realtek/rtl838x/config-6.6
index 3020e58a680e108cc0fcfba66db8411bb123fe67..b193377dda6e12c0aee89a8c2d665003370067de 100644 (file)
--- a/target/linux/realtek/rtl838x/config-6.6
+++ b/target/linux/realtek/rtl838x/config-6.6
@@ -210,6 +210,7 @@ CONFIG_REALTEK_OTTO_TIMER=y
 CONFIG_REALTEK_OTTO_WDT=y
 CONFIG_REALTEK_PHY=y
 CONFIG_REALTEK_SOC_PHY=y
+CONFIG_REALTEK_THERMAL=y
 CONFIG_REGMAP=y
 CONFIG_REGMAP_I2C=y
 CONFIG_REGMAP_MDIO=y
@@ -237,6 +238,14 @@ CONFIG_SYS_SUPPORTS_BIG_ENDIAN=y
 CONFIG_SYS_SUPPORTS_HIGHMEM=y
 CONFIG_SYS_SUPPORTS_MIPS16=y
 CONFIG_TARGET_ISA_REV=2
+CONFIG_THERMAL=y
+CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
+# CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set
+# CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE is not set
+CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
+CONFIG_THERMAL_GOV_STEP_WISE=y
+CONFIG_THERMAL_HWMON=y
+CONFIG_THERMAL_OF=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y
 CONFIG_TIMER_PROBE=y

diff --git a/target/linux/realtek/rtl930x/config-6.6 b/target/linux/realtek/rtl930x/config-6.6
index a381e888248fda9bd2b398ceced0be5e3ed345b9..a79ad61c24b27b76d80e0cf84ad780ddf880620b 100644 (file)
--- a/target/linux/realtek/rtl930x/config-6.6
+++ b/target/linux/realtek/rtl930x/config-6.6
@@ -188,6 +188,7 @@ CONFIG_REALTEK_OTTO_TIMER=y
 CONFIG_REALTEK_OTTO_WDT=y
 CONFIG_REALTEK_PHY=y
 CONFIG_REALTEK_SOC_PHY=y
+CONFIG_REALTEK_THERMAL=y
 CONFIG_REGMAP=y
 CONFIG_REGMAP_I2C=y
 CONFIG_REGMAP_MDIO=y
@@ -216,6 +217,14 @@ CONFIG_SYS_SUPPORTS_HIGHMEM=y
 CONFIG_SYS_SUPPORTS_MIPS16=y
 CONFIG_SYS_SUPPORTS_MULTITHREADING=y
 CONFIG_TARGET_ISA_REV=2
+CONFIG_THERMAL=y
+CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
+# CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set
+# CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE is not set
+CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS=0
+CONFIG_THERMAL_GOV_STEP_WISE=y
+CONFIG_THERMAL_HWMON=y
+CONFIG_THERMAL_OF=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_TIMER_OF=y
 CONFIG_TIMER_PROBE=y