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Message-ID: <20200624211038.GA72859@roeck-us.net>
Date: Wed, 24 Jun 2020 14:10:38 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Lars Povlsen <lars.povlsen@...rochip.com>
Cc: Jean Delvare <jdelvare@...e.com>,
Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH v4 3/3] hwmon: sparx5: Add Sparx5 SoC temperature driver
On Thu, Jun 18, 2020 at 03:59:51PM +0200, Lars Povlsen wrote:
> This patch adds a temperature sensor driver to the Sparx5 SoC.
>
> Signed-off-by: Lars Povlsen <lars.povlsen@...rochip.com>
Sorry for the long delay.
We'll still need approval from DT for DT properties.
> ---
> Documentation/hwmon/sparx5-temp.rst | 33 ++++++
Nitpick: The new file needs to be added to index.rst.
Other than that, for my reference:
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> drivers/hwmon/Kconfig | 10 ++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/sparx5-temp.c | 168 ++++++++++++++++++++++++++++
> 4 files changed, 212 insertions(+)
> create mode 100644 Documentation/hwmon/sparx5-temp.rst
> create mode 100644 drivers/hwmon/sparx5-temp.c
>
> diff --git a/Documentation/hwmon/sparx5-temp.rst b/Documentation/hwmon/sparx5-temp.rst
> new file mode 100644
> index 0000000000000..0140809089542
> --- /dev/null
> +++ b/Documentation/hwmon/sparx5-temp.rst
> @@ -0,0 +1,33 @@
> +.. 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@...rochip.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.)
> +======================= ========================================================
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 288ae9f63588c..7fb5e0c6c6306 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -515,6 +515,16 @@ 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
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 3e32c21f5efe3..857293f650412 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -167,6 +167,7 @@ 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
> diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
> new file mode 100644
> index 0000000000000..7d7a060259a80
> --- /dev/null
> +++ b/drivers/hwmon/sparx5-temp.c
> @@ -0,0 +1,168 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/* Sparx5 SoC temperature sensor driver
> + *
> + * Copyright (C) 2020 Lars Povlsen <lars.povlsen@...rochip.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@...rochip.com>");
> +MODULE_DESCRIPTION("Sparx5 SoC temperature sensor driver");
> +MODULE_LICENSE("GPL");
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