diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch b/target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch new file mode 100644 index 0000000000..d7e438fd72 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0750-thermal-Add-BCM2711-thermal-driver.patch @@ -0,0 +1,173 @@ +From 84477b71c184345517625f5c3eccf26a29eac4df Mon Sep 17 00:00:00 2001 +From: Stefan Wahren <stefan.wahren@i2se.com> +Date: Mon, 13 Jan 2020 19:56:16 +0100 +Subject: [PATCH] thermal: Add BCM2711 thermal driver + +Commit 59b781352dc4cb9ae27a8ddae0cda979d29d8af7 upstream. + +This adds the thermal sensor driver for the Broadcom BCM2711 SoC, +which is placed on the Raspberry Pi 4. The driver only provides +SoC temperature reading so far. + +Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> +Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> +Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> +Link: https://lore.kernel.org/r/1578941778-23321-3-git-send-email-stefan.wahren@i2se.com +Signed-off-by: Chen-Yu Tsai <wens@csie.org> +--- + drivers/thermal/broadcom/Kconfig | 7 ++ + drivers/thermal/broadcom/Makefile | 1 + + drivers/thermal/broadcom/bcm2711_thermal.c | 123 +++++++++++++++++++++ + 3 files changed, 131 insertions(+) + create mode 100644 drivers/thermal/broadcom/bcm2711_thermal.c + +--- a/drivers/thermal/broadcom/Kconfig ++++ b/drivers/thermal/broadcom/Kconfig +@@ -1,4 +1,11 @@ + # SPDX-License-Identifier: GPL-2.0-only ++config BCM2711_THERMAL ++ tristate "Broadcom AVS RO thermal sensor driver" ++ depends on ARCH_BCM2835 || COMPILE_TEST ++ depends on THERMAL_OF && MFD_SYSCON ++ help ++ Support for thermal sensors on Broadcom BCM2711 SoCs. ++ + config BCM2835_THERMAL + tristate "Thermal sensors on bcm2835 SoC" + depends on ARCH_BCM2835 || COMPILE_TEST +--- a/drivers/thermal/broadcom/Makefile ++++ b/drivers/thermal/broadcom/Makefile +@@ -1,4 +1,5 @@ + # SPDX-License-Identifier: GPL-2.0-only ++obj-$(CONFIG_BCM2711_THERMAL) += bcm2711_thermal.o + obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o + obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o + obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o +--- /dev/null ++++ b/drivers/thermal/broadcom/bcm2711_thermal.c +@@ -0,0 +1,123 @@ ++// SPDX-License-Identifier: GPL-2.0+ ++/* ++ * Broadcom AVS RO thermal sensor driver ++ * ++ * based on brcmstb_thermal ++ * ++ * Copyright (C) 2020 Stefan Wahren ++ */ ++ ++#include <linux/bitops.h> ++#include <linux/clk.h> ++#include <linux/device.h> ++#include <linux/err.h> ++#include <linux/io.h> ++#include <linux/kernel.h> ++#include <linux/mfd/syscon.h> ++#include <linux/module.h> ++#include <linux/platform_device.h> ++#include <linux/of_device.h> ++#include <linux/regmap.h> ++#include <linux/thermal.h> ++ ++#include "../thermal_hwmon.h" ++ ++#define AVS_RO_TEMP_STATUS 0x200 ++#define AVS_RO_TEMP_STATUS_VALID_MSK (BIT(16) | BIT(10)) ++#define AVS_RO_TEMP_STATUS_DATA_MSK GENMASK(9, 0) ++ ++struct bcm2711_thermal_priv { ++ struct regmap *regmap; ++ struct thermal_zone_device *thermal; ++}; ++ ++static int bcm2711_get_temp(void *data, int *temp) ++{ ++ struct bcm2711_thermal_priv *priv = data; ++ int slope = thermal_zone_get_slope(priv->thermal); ++ int offset = thermal_zone_get_offset(priv->thermal); ++ u32 val; ++ int ret; ++ long t; ++ ++ ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val); ++ if (ret) ++ return ret; ++ ++ if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK)) ++ return -EIO; ++ ++ val &= AVS_RO_TEMP_STATUS_DATA_MSK; ++ ++ /* Convert a HW code to a temperature reading (millidegree celsius) */ ++ t = slope * val + offset; ++ ++ *temp = t < 0 ? 0 : t; ++ ++ return 0; ++} ++ ++static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = { ++ .get_temp = bcm2711_get_temp, ++}; ++ ++static const struct of_device_id bcm2711_thermal_id_table[] = { ++ { .compatible = "brcm,bcm2711-thermal" }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table); ++ ++static int bcm2711_thermal_probe(struct platform_device *pdev) ++{ ++ struct thermal_zone_device *thermal; ++ struct bcm2711_thermal_priv *priv; ++ struct device *dev = &pdev->dev; ++ struct device_node *parent; ++ struct regmap *regmap; ++ int ret; ++ ++ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); ++ if (!priv) ++ return -ENOMEM; ++ ++ /* get regmap from syscon node */ ++ parent = of_get_parent(dev->of_node); /* parent should be syscon node */ ++ regmap = syscon_node_to_regmap(parent); ++ of_node_put(parent); ++ if (IS_ERR(regmap)) { ++ ret = PTR_ERR(regmap); ++ dev_err(dev, "failed to get regmap: %d\n", ret); ++ return ret; ++ } ++ priv->regmap = regmap; ++ ++ thermal = devm_thermal_zone_of_sensor_register(dev, 0, priv, ++ &bcm2711_thermal_of_ops); ++ if (IS_ERR(thermal)) { ++ ret = PTR_ERR(thermal); ++ dev_err(dev, "could not register sensor: %d\n", ret); ++ return ret; ++ } ++ ++ priv->thermal = thermal; ++ ++ thermal->tzp->no_hwmon = false; ++ ret = thermal_add_hwmon_sysfs(thermal); ++ if (ret) ++ return ret; ++ ++ return 0; ++} ++ ++static struct platform_driver bcm2711_thermal_driver = { ++ .probe = bcm2711_thermal_probe, ++ .driver = { ++ .name = "bcm2711_thermal", ++ .of_match_table = bcm2711_thermal_id_table, ++ }, ++}; ++module_platform_driver(bcm2711_thermal_driver); ++ ++MODULE_LICENSE("GPL"); ++MODULE_AUTHOR("Stefan Wahren"); ++MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver"); |