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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
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// SPDX-License-Identifier: GPL-2.0+ | ||
/* | ||
* Broadcom AVS RO thermal sensor driver | ||
* | ||
* based on brcmstb_thermal | ||
* | ||
* Copyright (C) 2020 Stefan Wahren | ||
*/ | ||
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#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> | ||
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#include "../thermal_hwmon.h" | ||
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#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) | ||
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struct bcm2711_thermal_priv { | ||
struct regmap *regmap; | ||
struct thermal_zone_device *thermal; | ||
}; | ||
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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; | ||
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ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val); | ||
if (ret) | ||
return ret; | ||
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if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK)) | ||
return -EIO; | ||
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val &= AVS_RO_TEMP_STATUS_DATA_MSK; | ||
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/* Convert a HW code to a temperature reading (millidegree celsius) */ | ||
t = slope * val + offset; | ||
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*temp = t < 0 ? 0 : t; | ||
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return 0; | ||
} | ||
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static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = { | ||
.get_temp = bcm2711_get_temp, | ||
}; | ||
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static const struct of_device_id bcm2711_thermal_id_table[] = { | ||
{ .compatible = "brcm,bcm2711-thermal" }, | ||
{}, | ||
}; | ||
MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table); | ||
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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; | ||
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | ||
if (!priv) | ||
return -ENOMEM; | ||
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/* 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; | ||
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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; | ||
} | ||
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priv->thermal = thermal; | ||
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thermal->tzp->no_hwmon = false; | ||
ret = thermal_add_hwmon_sysfs(thermal); | ||
if (ret) | ||
return ret; | ||
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return 0; | ||
} | ||
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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); | ||
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MODULE_LICENSE("GPL"); | ||
MODULE_AUTHOR("Stefan Wahren"); | ||
MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver"); |