hwmon: sparx5: Add Sparx5 SoC temperature driver (e4922176) · Commits · git / linux-net

Documentation/hwmon/sparx5-temp.rst

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		.. SPDX-License-Identifier: GPL-2.0-only

		Microchip SparX-5 SoC
		=====================

		Supported chips:

		* VSC7546, VSC7549, VSC755, VSC7556, and VSC7558 (Sparx5 series)

		Prefix: 'sparx5-temp'

		Addresses scanned: -

		Datasheet: Provided by Microchip upon request and under NDA

		Author: Lars Povlsen <lars.povlsen@microchip.com>

		Description
		-----------

		The Sparx5 SoC contains a temperature sensor based on the MR74060
		Moortec IP.

		The sensor has a range of -40°C to +125°C and an accuracy of +/-5°C.

		Sysfs entries
		-------------

		The following attributes are supported.

		======================= ========================================================
		temp1_input Die temperature (in millidegree Celsius.)
		======================= ========================================================

drivers/hwmon/Kconfig

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		@@ -525,6 +525,16 @@ config SENSORS_I5K_AMB
		This driver can also be built as a module. If so, the module
		will be called i5k_amb.

		config SENSORS_SPARX5
		tristate "Sparx5 SoC temperature sensor"
		depends on ARCH_SPARX5 \|\| COMPILE_TEST
		help
		If you say yes here you get support for temperature monitoring
		with the Microchip Sparx5 SoC.

		This driver can also be built as a module. If so, the module
		will be called sparx5-temp.

		config SENSORS_F71805F
		tristate "Fintek F71805F/FG, F71806F/FG and F71872F/FG"
		depends on !PPC

drivers/hwmon/Makefile

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		@@ -168,6 +168,7 @@ obj-$(CONFIG_SENSORS_SMM665) += smm665.o
		obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
		obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
		obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
		obj-$(CONFIG_SENSORS_SPARX5) += sparx5-temp.o
		obj-$(CONFIG_SENSORS_STTS751) += stts751.o
		obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
		obj-$(CONFIG_SENSORS_TC74) += tc74.o

drivers/hwmon/sparx5-temp.c

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		// SPDX-License-Identifier: GPL-2.0-or-later
		/* Sparx5 SoC temperature sensor driver
		*
		* Copyright (C) 2020 Lars Povlsen <lars.povlsen@microchip.com>
		*/

		#include <linux/bitfield.h>
		#include <linux/clk.h>
		#include <linux/hwmon.h>
		#include <linux/init.h>
		#include <linux/io.h>
		#include <linux/mod_devicetable.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>

		#define TEMP_CTRL 0
		#define TEMP_CFG 4
		#define TEMP_CFG_CYCLES GENMASK(24, 15)
		#define TEMP_CFG_ENA BIT(0)
		#define TEMP_STAT 8
		#define TEMP_STAT_VALID BIT(12)
		#define TEMP_STAT_TEMP GENMASK(11, 0)

		struct s5_hwmon {
		void __iomem *base;
		struct clk *clk;
		};

		static void s5_temp_clk_disable(void *data)
		{
		struct clk *clk = data;

		clk_disable_unprepare(clk);
		}

		static void s5_temp_enable(struct s5_hwmon *hwmon)
		{
		u32 val = readl(hwmon->base + TEMP_CFG);
		u32 clk = clk_get_rate(hwmon->clk) / USEC_PER_SEC;

		val &= ~TEMP_CFG_CYCLES;
		val \|= FIELD_PREP(TEMP_CFG_CYCLES, clk);
		val \|= TEMP_CFG_ENA;

		writel(val, hwmon->base + TEMP_CFG);
		}

		static int s5_read(struct device *dev, enum hwmon_sensor_types type,
		u32 attr, int channel, long *temp)
		{
		struct s5_hwmon *hwmon = dev_get_drvdata(dev);
		int rc = 0, value;
		u32 stat;

		switch (attr) {
		case hwmon_temp_input:
		stat = readl_relaxed(hwmon->base + TEMP_STAT);
		if (!(stat & TEMP_STAT_VALID))
		return -EIO;
		value = stat & TEMP_STAT_TEMP;
		/*
		* From register documentation:
		* Temp(C) = TEMP_SENSOR_STAT.TEMP / 4096 * 352.2 - 109.4
		*/
		value = DIV_ROUND_CLOSEST(value * 3522, 4096) - 1094;
		/*
		* Scale down by 10 from above and multiply by 1000 to
		* have millidegrees as specified by the hwmon sysfs
		* interface.
		*/
		value *= 100;
		*temp = value;
		break;
		default:
		rc = -EOPNOTSUPP;
		break;
		}

		return rc;
		}

		static umode_t s5_is_visible(const void *_data, enum hwmon_sensor_types type,
		u32 attr, int channel)
		{
		if (type != hwmon_temp)
		return 0;

		switch (attr) {
		case hwmon_temp_input:
		return 0444;
		default:
		return 0;
		}
		}

		static const struct hwmon_channel_info *s5_info[] = {
		HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
		HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
		NULL
		};

		static const struct hwmon_ops s5_hwmon_ops = {
		.is_visible = s5_is_visible,
		.read = s5_read,
		};

		static const struct hwmon_chip_info s5_chip_info = {
		.ops = &s5_hwmon_ops,
		.info = s5_info,
		};

		static int s5_temp_probe(struct platform_device *pdev)
		{
		struct device *hwmon_dev;
		struct s5_hwmon *hwmon;
		int ret;

		hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
		if (!hwmon)
		return -ENOMEM;

		hwmon->base = devm_platform_ioremap_resource(pdev, 0);
		if (IS_ERR(hwmon->base))
		return PTR_ERR(hwmon->base);

		hwmon->clk = devm_clk_get(&pdev->dev, NULL);
		if (IS_ERR(hwmon->clk))
		return PTR_ERR(hwmon->clk);

		ret = clk_prepare_enable(hwmon->clk);
		if (ret)
		return ret;

		ret = devm_add_action_or_reset(&pdev->dev, s5_temp_clk_disable,
		hwmon->clk);
		if (ret)
		return ret;

		s5_temp_enable(hwmon);

		hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
		"s5_temp",
		hwmon,
		&s5_chip_info,
		NULL);

		return PTR_ERR_OR_ZERO(hwmon_dev);
		}

		const struct of_device_id s5_temp_match[] = {
		{ .compatible = "microchip,sparx5-temp" },
		{},
		};
		MODULE_DEVICE_TABLE(of, s5_temp_match);

		static struct platform_driver s5_temp_driver = {
		.probe = s5_temp_probe,
		.driver = {
		.name = "sparx5-temp",
		.of_match_table = s5_temp_match,
		},
		};

		module_platform_driver(s5_temp_driver);

		MODULE_AUTHOR("Lars Povlsen <lars.povlsen@microchip.com>");
		MODULE_DESCRIPTION("Sparx5 SoC temperature sensor driver");
		MODULE_LICENSE("GPL");