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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
174 lines
5.0 KiB
Diff
174 lines
5.0 KiB
Diff
From 84477b71c184345517625f5c3eccf26a29eac4df Mon Sep 17 00:00:00 2001
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From: Stefan Wahren <stefan.wahren@i2se.com>
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Date: Mon, 13 Jan 2020 19:56:16 +0100
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Subject: [PATCH] thermal: Add BCM2711 thermal driver
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Commit 59b781352dc4cb9ae27a8ddae0cda979d29d8af7 upstream.
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This adds the thermal sensor driver for the Broadcom BCM2711 SoC,
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which is placed on the Raspberry Pi 4. The driver only provides
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SoC temperature reading so far.
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Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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Link: https://lore.kernel.org/r/1578941778-23321-3-git-send-email-stefan.wahren@i2se.com
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Signed-off-by: Chen-Yu Tsai <wens@csie.org>
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---
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drivers/thermal/broadcom/Kconfig | 7 ++
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drivers/thermal/broadcom/Makefile | 1 +
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drivers/thermal/broadcom/bcm2711_thermal.c | 123 +++++++++++++++++++++
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3 files changed, 131 insertions(+)
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create mode 100644 drivers/thermal/broadcom/bcm2711_thermal.c
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--- a/drivers/thermal/broadcom/Kconfig
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+++ b/drivers/thermal/broadcom/Kconfig
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@@ -1,4 +1,11 @@
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# SPDX-License-Identifier: GPL-2.0-only
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+config BCM2711_THERMAL
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+ tristate "Broadcom AVS RO thermal sensor driver"
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+ depends on ARCH_BCM2835 || COMPILE_TEST
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+ depends on THERMAL_OF && MFD_SYSCON
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+ help
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+ Support for thermal sensors on Broadcom BCM2711 SoCs.
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+
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config BCM2835_THERMAL
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tristate "Thermal sensors on bcm2835 SoC"
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depends on ARCH_BCM2835 || COMPILE_TEST
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--- a/drivers/thermal/broadcom/Makefile
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+++ b/drivers/thermal/broadcom/Makefile
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@@ -1,4 +1,5 @@
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# SPDX-License-Identifier: GPL-2.0-only
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+obj-$(CONFIG_BCM2711_THERMAL) += bcm2711_thermal.o
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obj-$(CONFIG_BCM2835_THERMAL) += bcm2835_thermal.o
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obj-$(CONFIG_BRCMSTB_THERMAL) += brcmstb_thermal.o
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obj-$(CONFIG_BCM_NS_THERMAL) += ns-thermal.o
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--- /dev/null
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+++ b/drivers/thermal/broadcom/bcm2711_thermal.c
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@@ -0,0 +1,123 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Broadcom AVS RO thermal sensor driver
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+ *
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+ * based on brcmstb_thermal
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+ *
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+ * Copyright (C) 2020 Stefan Wahren
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+ */
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+
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+#include <linux/bitops.h>
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+#include <linux/clk.h>
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+#include <linux/device.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/kernel.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/of_device.h>
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+#include <linux/regmap.h>
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+#include <linux/thermal.h>
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+
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+#include "../thermal_hwmon.h"
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+
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+#define AVS_RO_TEMP_STATUS 0x200
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+#define AVS_RO_TEMP_STATUS_VALID_MSK (BIT(16) | BIT(10))
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+#define AVS_RO_TEMP_STATUS_DATA_MSK GENMASK(9, 0)
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+
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+struct bcm2711_thermal_priv {
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+ struct regmap *regmap;
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+ struct thermal_zone_device *thermal;
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+};
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+
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+static int bcm2711_get_temp(void *data, int *temp)
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+{
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+ struct bcm2711_thermal_priv *priv = data;
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+ int slope = thermal_zone_get_slope(priv->thermal);
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+ int offset = thermal_zone_get_offset(priv->thermal);
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+ u32 val;
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+ int ret;
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+ long t;
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+
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+ ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
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+ if (ret)
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+ return ret;
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+
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+ if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK))
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+ return -EIO;
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+
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+ val &= AVS_RO_TEMP_STATUS_DATA_MSK;
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+
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+ /* Convert a HW code to a temperature reading (millidegree celsius) */
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+ t = slope * val + offset;
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+
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+ *temp = t < 0 ? 0 : t;
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+
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+ return 0;
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+}
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+
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+static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = {
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+ .get_temp = bcm2711_get_temp,
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+};
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+
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+static const struct of_device_id bcm2711_thermal_id_table[] = {
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+ { .compatible = "brcm,bcm2711-thermal" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);
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+
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+static int bcm2711_thermal_probe(struct platform_device *pdev)
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+{
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+ struct thermal_zone_device *thermal;
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+ struct bcm2711_thermal_priv *priv;
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+ struct device *dev = &pdev->dev;
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+ struct device_node *parent;
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+ struct regmap *regmap;
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+ int ret;
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+
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+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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+ if (!priv)
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+ return -ENOMEM;
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+
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+ /* get regmap from syscon node */
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+ parent = of_get_parent(dev->of_node); /* parent should be syscon node */
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+ regmap = syscon_node_to_regmap(parent);
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+ of_node_put(parent);
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+ if (IS_ERR(regmap)) {
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+ ret = PTR_ERR(regmap);
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+ dev_err(dev, "failed to get regmap: %d\n", ret);
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+ return ret;
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+ }
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+ priv->regmap = regmap;
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+
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+ thermal = devm_thermal_zone_of_sensor_register(dev, 0, priv,
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+ &bcm2711_thermal_of_ops);
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+ if (IS_ERR(thermal)) {
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+ ret = PTR_ERR(thermal);
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+ dev_err(dev, "could not register sensor: %d\n", ret);
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+ return ret;
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+ }
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+
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+ priv->thermal = thermal;
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+
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+ thermal->tzp->no_hwmon = false;
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+ ret = thermal_add_hwmon_sysfs(thermal);
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+ if (ret)
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+ return ret;
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+
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+ return 0;
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+}
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+
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+static struct platform_driver bcm2711_thermal_driver = {
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+ .probe = bcm2711_thermal_probe,
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+ .driver = {
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+ .name = "bcm2711_thermal",
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+ .of_match_table = bcm2711_thermal_id_table,
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+ },
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+};
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+module_platform_driver(bcm2711_thermal_driver);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Stefan Wahren");
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+MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");
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