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Message-Id: <20250912120745.2295115-7-mwalle@kernel.org>
Date: Fri, 12 Sep 2025 14:07:44 +0200
From: Michael Walle <mwalle@...nel.org>
To: Nishanth Menon <nm@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Tero Kristo <kristo@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Michael Walle <mwalle@...nel.org>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Lee Jones <lee@...nel.org>,
Srinivas Kandagatla <srini@...nel.org>,
Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc: linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org,
linux-watchdog@...r.kernel.org,
Andrew Davis <afd@...com>
Subject: [PATCH v2 6/7] hwmon: add SMARC-sAM67 support
Add a new driver for the Kontron SMARC-sAM67 board management
controller. It has two voltage sensors and one temperature sensor.
Signed-off-by: Michael Walle <mwalle@...nel.org>
---
Documentation/hwmon/sa67.rst | 41 +++++++++
MAINTAINERS | 1 +
drivers/hwmon/Kconfig | 10 +++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/sa67mcu-hwmon.c | 161 ++++++++++++++++++++++++++++++++++
5 files changed, 214 insertions(+)
create mode 100644 Documentation/hwmon/sa67.rst
create mode 100644 drivers/hwmon/sa67mcu-hwmon.c
diff --git a/Documentation/hwmon/sa67.rst b/Documentation/hwmon/sa67.rst
new file mode 100644
index 000000000000..029c7c169b7f
--- /dev/null
+++ b/Documentation/hwmon/sa67.rst
@@ -0,0 +1,41 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+Kernel driver sa67mcu
+=====================
+
+Supported chips:
+
+ * Kontron sa67mcu
+
+ Prefix: 'sa67mcu'
+
+ Datasheet: not available
+
+Authors: Michael Walle <mwalle@...nel.org>
+
+Description
+-----------
+
+The sa67mcu is a board management controller which also exposes a hardware
+monitoring controller.
+
+The controller has two voltage and one temperature sensor. The values are
+hold in two 8 bit registers to form one 16 bit value. Reading the lower byte
+will also capture the high byte to make the access atomic. The unit of the
+volatge sensors are 1mV and the unit of the temperature sensor is 0.1degC.
+
+Sysfs entries
+-------------
+
+The following attributes are supported.
+
+======================= ========================================================
+in0_label "VDDIN"
+in0_input Measured VDDIN voltage.
+
+in1_label "VDD_RTC"
+in1_input Measured VDD_RTC voltage.
+
+temp1_input MCU temperature. Roughly the board temperature.
+======================= ========================================================
+
diff --git a/MAINTAINERS b/MAINTAINERS
index fa7f80bd7b2f..69fcd5c077ae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23489,6 +23489,7 @@ F: Documentation/devicetree/bindings/interrupt-controller/kontron,sl28cpld-intc.
F: Documentation/devicetree/bindings/pwm/kontron,sl28cpld-pwm.yaml
F: Documentation/devicetree/bindings/watchdog/kontron,sl28cpld-wdt.yaml
F: drivers/gpio/gpio-sl28cpld.c
+F: drivers/hwmon/sa67mcu-hwmon.c
F: drivers/hwmon/sl28cpld-hwmon.c
F: drivers/irqchip/irq-sl28cpld.c
F: drivers/pwm/pwm-sl28cpld.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index d6769288a76e..c2f288ebdf44 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1905,6 +1905,16 @@ config SENSORS_RASPBERRYPI_HWMON
This driver can also be built as a module. If so, the module
will be called raspberrypi-hwmon.
+config SENSORS_SA67MCU
+ tristate "Kontron sa67mcu hardware monitoring driver"
+ depends on MFD_SL28CPLD || COMPILE_TEST
+ help
+ If you say yes here you get support for the voltage and temperature
+ monitor of the sa67 board management controller.
+
+ This driver can also be built as a module. If so, the module
+ will be called sa67mcu-hwmon.
+
config SENSORS_SL28CPLD
tristate "Kontron sl28cpld hardware monitoring driver"
depends on MFD_SL28CPLD || COMPILE_TEST
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 051981eb8a50..2956898776bb 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -197,6 +197,7 @@ obj-$(CONFIG_SENSORS_PT5161L) += pt5161l.o
obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
obj-$(CONFIG_SENSORS_QNAP_MCU_HWMON) += qnap-mcu-hwmon.o
obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o
+obj-$(CONFIG_SENSORS_SA67MCU) += sa67mcu-hwmon.o
obj-$(CONFIG_SENSORS_SBTSI) += sbtsi_temp.o
obj-$(CONFIG_SENSORS_SBRMI) += sbrmi.o
obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
diff --git a/drivers/hwmon/sa67mcu-hwmon.c b/drivers/hwmon/sa67mcu-hwmon.c
new file mode 100644
index 000000000000..22f703b7b256
--- /dev/null
+++ b/drivers/hwmon/sa67mcu-hwmon.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sl67mcu hardware monitoring driver
+ *
+ * Copyright 2025 Kontron Europe GmbH
+ */
+
+#include <linux/bitfield.h>
+#include <linux/hwmon.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define SA67MCU_VOLTAGE(n) (0x00 + ((n) * 2))
+#define SA67MCU_TEMP(n) (0x04 + ((n) * 2))
+
+struct sa67mcu_hwmon {
+ struct regmap *regmap;
+ u32 offset;
+};
+
+static int sa67mcu_hwmon_read(struct device *dev,
+ enum hwmon_sensor_types type, u32 attr,
+ int channel, long *input)
+{
+ struct sa67mcu_hwmon *hwmon = dev_get_drvdata(dev);
+ unsigned int offset;
+ u8 reg[2];
+ int ret;
+
+ switch (type) {
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_input:
+ offset = hwmon->offset + SA67MCU_VOLTAGE(channel);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ break;
+ case hwmon_temp:
+ switch (attr) {
+ case hwmon_temp_input:
+ offset = hwmon->offset + SA67MCU_TEMP(channel);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ /* Reading the low byte will capture the value */
+ ret = regmap_bulk_read(hwmon->regmap, offset, reg, ARRAY_SIZE(reg));
+ if (ret)
+ return ret;
+
+ *input = reg[1] << 8 | reg[0];
+
+ /* Temperatures are s16 and in 0.1degC steps. */
+ if (type == hwmon_temp)
+ *input = sign_extend32(*input, 15) * 100;
+
+ return 0;
+}
+
+static const struct hwmon_channel_info * const sa67mcu_hwmon_info[] = {
+ HWMON_CHANNEL_INFO(in,
+ HWMON_I_INPUT | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_LABEL),
+ HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
+ NULL
+};
+
+static const char *const sa67mcu_hwmon_in_labels[] = {
+ "VDDIN",
+ "VDD_RTC",
+};
+
+static int sa67mcu_hwmon_read_string(struct device *dev,
+ enum hwmon_sensor_types type, u32 attr,
+ int channel, const char **str)
+{
+ switch (type) {
+ case hwmon_in:
+ switch (attr) {
+ case hwmon_in_label:
+ *str = sa67mcu_hwmon_in_labels[channel];
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static const struct hwmon_ops sa67mcu_hwmon_ops = {
+ .visible = 0444,
+ .read = sa67mcu_hwmon_read,
+ .read_string = sa67mcu_hwmon_read_string,
+};
+
+static const struct hwmon_chip_info sa67mcu_hwmon_chip_info = {
+ .ops = &sa67mcu_hwmon_ops,
+ .info = sa67mcu_hwmon_info,
+};
+
+static int sa67mcu_hwmon_probe(struct platform_device *pdev)
+{
+ struct sa67mcu_hwmon *hwmon;
+ struct device *hwmon_dev;
+ int ret;
+
+ if (!pdev->dev.parent)
+ return -ENODEV;
+
+ hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
+ if (!hwmon)
+ return -ENOMEM;
+
+ hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!hwmon->regmap)
+ return -ENODEV;
+
+ ret = device_property_read_u32(&pdev->dev, "reg", &hwmon->offset);
+ if (ret)
+ return -EINVAL;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
+ "sa67mcu_hwmon", hwmon,
+ &sa67mcu_hwmon_chip_info,
+ NULL);
+ if (IS_ERR(hwmon_dev))
+ dev_err(&pdev->dev, "failed to register as hwmon device");
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id sa67mcu_hwmon_of_match[] = {
+ { .compatible = "kontron,sa67mcu-hwmon", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sa67mcu_hwmon_of_match);
+
+static struct platform_driver sa67mcu_hwmon_driver = {
+ .probe = sa67mcu_hwmon_probe,
+ .driver = {
+ .name = "sa67mcu-hwmon",
+ .of_match_table = sa67mcu_hwmon_of_match,
+ },
+};
+module_platform_driver(sa67mcu_hwmon_driver);
+
+MODULE_DESCRIPTION("sa67mcu Hardware Monitoring Driver");
+MODULE_AUTHOR("Michael Walle <mwalle@...nel.org>");
+MODULE_LICENSE("GPL");
--
2.39.5
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