[PATCH 0/3] hwmon: Adding support for Microchip Sparx5 SoC

[PATCH 0/3] hwmon: Adding support for Microchip Sparx5 SoC

[Lars Povlsen]

This is an add-on series to the main SoC Sparx5 series
(Message-ID: <20200513125532.24585-1-lars.povlsen@microchip.com>).

It is expected that the DT patches are to be taken directly by the arm-soc
maintainers.

Lars Povlsen (3):
  dt-bindings: hwmon: Add Sparx5 temperature sensor
  arm64: dts: sparx5: Add hwmon temperature sensor
  hwmon: sparx5: Add Sparx5 SoC temperature driver

 .../bindings/hwmon/microchip,sparx5-temp.yaml |  39 +++++
 arch/arm64/boot/dts/microchip/sparx5.dtsi     |   6 +
 drivers/hwmon/Kconfig                         |  10 ++
 drivers/hwmon/Makefile                        |   2 +-
 drivers/hwmon/sparx5-temp.c                   | 154 ++++++++++++++++++
 5 files changed, 210 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,sparx5-temp.yaml
 create mode 100644 drivers/hwmon/sparx5-temp.c

--
2.26.2

[PATCH 1/3] dt-bindings: hwmon: Add Sparx5 temperature sensor

[Lars Povlsen]

This add the DT binding specification for the Sparx5 temperature
sensor.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
 .../bindings/hwmon/microchip,sparx5-temp.yaml | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,sparx5-temp.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/microchip,sparx5-temp.yaml b/Documentation/devicetree/bindings/hwmon/microchip,sparx5-temp.yaml
new file mode 100644
index 0000000000000..0df4813fd7b24
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/microchip,sparx5-temp.yaml
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/microchip,sparx5-temp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Sparx5 Temperature Monitor
+
+maintainers:
+  - Lars Povlsen <lars.povlsen@microchip.com>
+
+description: |
+  Microchip Sparx5 embedded temperature monitor
+
+properties:
+  compatible:
+    enum:
+      - microchip,sparx5-temp
+
+  reg:
+    maxItems: 1
+
+  '#thermal-sensor-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    tmon0: tmon@610508110 {
+        compatible = "microchip,sparx5-temp";
+        reg = <0x10508110 0xc>;
+        #thermal-sensor-cells = <0>;
+    };
+
--
2.26.2

[PATCH 2/3] arm64: dts: sparx5: Add hwmon temperature sensor

[Lars Povlsen]

This adds a hwmon temperature node sensor to the Sparx5 SoC.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
 arch/arm64/boot/dts/microchip/sparx5.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi b/arch/arm64/boot/dts/microchip/sparx5.dtsi
index f09a49c41ce19..b5f2d088af30e 100644
--- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
+++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
@@ -233,5 +233,11 @@ i2c1: i2c@600103000 {
 			clock-frequency = <100000>;
 			clocks = <&ahb_clk>;
 		};
+
+		tmon0: tmon@610508110 {
+			compatible = "microchip,sparx5-temp";
+			reg = <0x6 0x10508110 0xc>;
+			#thermal-sensor-cells = <0>;
+		};
 	};
 };
--
2.26.2

[PATCH 3/3] hwmon: sparx5: Add Sparx5 SoC temperature driver

[Lars Povlsen]

This patch adds a temperature sensor driver to the Sparx5 SoC.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
 drivers/hwmon/Kconfig       |  10 +++
 drivers/hwmon/Makefile      |   2 +-
 drivers/hwmon/sparx5-temp.c | 154 ++++++++++++++++++++++++++++++++++++
 3 files changed, 165 insertions(+), 1 deletion(-)
 create mode 100644 drivers/hwmon/sparx5-temp.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 4c62f900bf7e8..130cb1f1748ff 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -480,6 +480,16 @@ 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
+	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 b0b9c8e571762..28a09986b7a62 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_SENSORS_DS1621)	+= ds1621.o
 obj-$(CONFIG_SENSORS_EMC1403)	+= emc1403.o
 obj-$(CONFIG_SENSORS_EMC2103)	+= emc2103.o
 obj-$(CONFIG_SENSORS_EMC6W201)	+= emc6w201.o
+obj-$(CONFIG_SENSORS_SPARX5)	+= sparx5-temp.o
 obj-$(CONFIG_SENSORS_F71805F)	+= f71805f.o
 obj-$(CONFIG_SENSORS_F71882FG)	+= f71882fg.o
 obj-$(CONFIG_SENSORS_F75375S)	+= f75375s.o
@@ -190,4 +191,3 @@ obj-$(CONFIG_SENSORS_OCC)	+= occ/
 obj-$(CONFIG_PMBUS)		+= pmbus/

 ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
-
diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
new file mode 100644
index 0000000000000..bf9dd102a9825
--- /dev/null
+++ b/drivers/hwmon/sparx5-temp.c
@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Sparx5 SoC temperature sensor driver
+ *
+ * Copyright (C) 2020 Lars Povlsen <lars.povlsen@microchip.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#define TEMP_CTRL		0
+#define TEMP_CFG		4
+#define  TEMP_CFG_CYCLES	GENMASK(24, 15)
+#define  TEMP_CFG_CYCLES_OFF	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;
+};
+
+static void s5_temp_enable(struct s5_hwmon *hwmon)
+{
+	u32 val = readl(hwmon->base + TEMP_CFG);
+	u32 clk = 250;
+
+	val &= ~TEMP_CFG_CYCLES;
+	val |= (clk << TEMP_CFG_CYCLES_OFF);
+	val |= TEMP_CFG_ENA;
+
+	writel(val, hwmon->base + TEMP_CFG);
+}
+
+static void s5_temp_disable(void *data)
+{
+	struct s5_hwmon *hwmon = data;
+	u32 val = readl(hwmon->base + TEMP_CFG);
+
+	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) {
+			value = (stat & TEMP_STAT_TEMP);
+			value = DIV_ROUND_CLOSEST(value * 3522, 4096) - 1094;
+			value *= 100;
+			*temp = value;
+		} else
+			rc = -EINVAL;
+		break;
+	default:
+		rc = -EOPNOTSUPP;
+	}
+
+	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 err = 0;
+
+	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);
+
+	err = devm_add_action(&pdev->dev, s5_temp_disable, hwmon);
+	if (err)
+		return err;
+
+	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");
--
2.26.2

Re: [PATCH 3/3] hwmon: sparx5: Add Sparx5 SoC temperature driver

[Guenter Roeck]

On Wed, May 13, 2020 at 03:41:40PM +0200, Lars Povlsen wrote:
> This patch adds a temperature sensor driver to the Sparx5 SoC.
> 
> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
> ---
>  drivers/hwmon/Kconfig       |  10 +++
>  drivers/hwmon/Makefile      |   2 +-
>  drivers/hwmon/sparx5-temp.c | 154 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 165 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/hwmon/sparx5-temp.c
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 4c62f900bf7e8..130cb1f1748ff 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -480,6 +480,16 @@ 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
> +	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 b0b9c8e571762..28a09986b7a62 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -64,6 +64,7 @@ obj-$(CONFIG_SENSORS_DS1621)	+= ds1621.o
>  obj-$(CONFIG_SENSORS_EMC1403)	+= emc1403.o
>  obj-$(CONFIG_SENSORS_EMC2103)	+= emc2103.o
>  obj-$(CONFIG_SENSORS_EMC6W201)	+= emc6w201.o
> +obj-$(CONFIG_SENSORS_SPARX5)	+= sparx5-temp.o
>  obj-$(CONFIG_SENSORS_F71805F)	+= f71805f.o
>  obj-$(CONFIG_SENSORS_F71882FG)	+= f71882fg.o
>  obj-$(CONFIG_SENSORS_F75375S)	+= f75375s.o
> @@ -190,4 +191,3 @@ obj-$(CONFIG_SENSORS_OCC)	+= occ/
>  obj-$(CONFIG_PMBUS)		+= pmbus/
> 
>  ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
> -
> diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
> new file mode 100644
> index 0000000000000..bf9dd102a9825
> --- /dev/null
> +++ b/drivers/hwmon/sparx5-temp.c
> @@ -0,0 +1,154 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/* Sparx5 SoC temperature sensor driver
> + *
> + * Copyright (C) 2020 Lars Povlsen <lars.povlsen@microchip.com>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>

Unnecessary include

> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#define TEMP_CTRL		0
> +#define TEMP_CFG		4
> +#define  TEMP_CFG_CYCLES	GENMASK(24, 15)
> +#define  TEMP_CFG_CYCLES_OFF	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;
> +};
> +
> +static void s5_temp_enable(struct s5_hwmon *hwmon)
> +{
> +	u32 val = readl(hwmon->base + TEMP_CFG);
> +	u32 clk = 250;
> +
> +	val &= ~TEMP_CFG_CYCLES;
> +	val |= (clk << TEMP_CFG_CYCLES_OFF);
> +	val |= TEMP_CFG_ENA;
> +
> +	writel(val, hwmon->base + TEMP_CFG);
> +}
> +
> +static void s5_temp_disable(void *data)
> +{
> +	struct s5_hwmon *hwmon = data;
> +	u32 val = readl(hwmon->base + TEMP_CFG);
> +
> +	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) {
> +			value = (stat & TEMP_STAT_TEMP);

Unnecessary ( )

> +			value = DIV_ROUND_CLOSEST(value * 3522, 4096) - 1094;
> +			value *= 100;
> +			*temp = value;
> +		} else
> +			rc = -EINVAL;

-EINVAL is for bad used input. -EIO, maybe, unless there is a better error.
Also,

		if (!(stat & TEMP_STAT_VALID))
			return -EIO;
		...

would be easier to read (and not result in a checkpatch warning).

> +		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 err = 0;

Unnecessary initialization

> +
> +	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);
> +
> +	err = devm_add_action(&pdev->dev, s5_temp_disable, hwmon);
> +	if (err)
> +		return err;
> +
> +	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");
> --
> 2.26.2

Re: [PATCH 3/3] hwmon: sparx5: Add Sparx5 SoC temperature driver

[Lars Povlsen]

Guenter Roeck writes:

> On Wed, May 13, 2020 at 03:41:40PM +0200, Lars Povlsen wrote:
>> This patch adds a temperature sensor driver to the Sparx5 SoC.
>>
>> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
>> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
>> ---
>>  drivers/hwmon/Kconfig       |  10 +++
>>  drivers/hwmon/Makefile      |   2 +-
>>  drivers/hwmon/sparx5-temp.c | 154 ++++++++++++++++++++++++++++++++++++
>>  3 files changed, 165 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/hwmon/sparx5-temp.c
>>
>> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
>> index 4c62f900bf7e8..130cb1f1748ff 100644
>> --- a/drivers/hwmon/Kconfig
>> +++ b/drivers/hwmon/Kconfig
>> @@ -480,6 +480,16 @@ 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
>> +     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 b0b9c8e571762..28a09986b7a62 100644
>> --- a/drivers/hwmon/Makefile
>> +++ b/drivers/hwmon/Makefile
>> @@ -64,6 +64,7 @@ obj-$(CONFIG_SENSORS_DS1621)        += ds1621.o
>>  obj-$(CONFIG_SENSORS_EMC1403)        += emc1403.o
>>  obj-$(CONFIG_SENSORS_EMC2103)        += emc2103.o
>>  obj-$(CONFIG_SENSORS_EMC6W201)       += emc6w201.o
>> +obj-$(CONFIG_SENSORS_SPARX5) += sparx5-temp.o
>>  obj-$(CONFIG_SENSORS_F71805F)        += f71805f.o
>>  obj-$(CONFIG_SENSORS_F71882FG)       += f71882fg.o
>>  obj-$(CONFIG_SENSORS_F75375S)        += f75375s.o
>> @@ -190,4 +191,3 @@ obj-$(CONFIG_SENSORS_OCC) += occ/
>>  obj-$(CONFIG_PMBUS)          += pmbus/
>>
>>  ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
>> -
>> diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
>> new file mode 100644
>> index 0000000000000..bf9dd102a9825
>> --- /dev/null
>> +++ b/drivers/hwmon/sparx5-temp.c
>> @@ -0,0 +1,154 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +/* Sparx5 SoC temperature sensor driver
>> + *
>> + * Copyright (C) 2020 Lars Povlsen <lars.povlsen@microchip.com>
>> + */
>> +
>> +#include <linux/bitops.h>
>> +#include <linux/hwmon.h>
>> +#include <linux/hwmon-sysfs.h>
>
> Unnecessary include

Ack.

>
>> +#include <linux/init.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +
>> +#define TEMP_CTRL            0
>> +#define TEMP_CFG             4
>> +#define  TEMP_CFG_CYCLES     GENMASK(24, 15)
>> +#define  TEMP_CFG_CYCLES_OFF 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;
>> +};
>> +
>> +static void s5_temp_enable(struct s5_hwmon *hwmon)
>> +{
>> +     u32 val = readl(hwmon->base + TEMP_CFG);
>> +     u32 clk = 250;
>> +
>> +     val &= ~TEMP_CFG_CYCLES;
>> +     val |= (clk << TEMP_CFG_CYCLES_OFF);
>> +     val |= TEMP_CFG_ENA;
>> +
>> +     writel(val, hwmon->base + TEMP_CFG);
>> +}
>> +
>> +static void s5_temp_disable(void *data)
>> +{
>> +     struct s5_hwmon *hwmon = data;
>> +     u32 val = readl(hwmon->base + TEMP_CFG);
>> +
>> +     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) {
>> +                     value = (stat & TEMP_STAT_TEMP);
>
> Unnecessary ( )

Removed.

>
>> +                     value = DIV_ROUND_CLOSEST(value * 3522, 4096) - 1094;
>> +                     value *= 100;
>> +                     *temp = value;
>> +             } else
>> +                     rc = -EINVAL;
>
> -EINVAL is for bad used input. -EIO, maybe, unless there is a better error.
> Also,
>
>                 if (!(stat & TEMP_STAT_VALID))
>                         return -EIO;

Ok, changed.

>                 ...
>
> would be easier to read (and not result in a checkpatch warning).
>
>> +             break;
>> +     default:
>> +             rc = -EOPNOTSUPP;
>
>                 break;
>

Added.

>> +     }
>> +
>> +     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 err = 0;
>
> Unnecessary initialization
>

Removed

>> +
>> +     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);
>> +
>> +     err = devm_add_action(&pdev->dev, s5_temp_disable, hwmon);
>> +     if (err)
>> +             return err;
>> +
>> +     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");
>> --
>> 2.26.2

Thank you for your input, I will submit anew asap.

---Lars

-- 
Lars Povlsen,
Microchip

Re: [PATCH 2/3] arm64: dts: sparx5: Add hwmon temperature sensor

[Rob Herring]

On Wed, May 13, 2020 at 03:41:39PM +0200, Lars Povlsen wrote:
> This adds a hwmon temperature node sensor to the Sparx5 SoC.
> 
> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
> ---
>  arch/arm64/boot/dts/microchip/sparx5.dtsi | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> index f09a49c41ce19..b5f2d088af30e 100644
> --- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
> +++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> @@ -233,5 +233,11 @@ i2c1: i2c@600103000 {
>  			clock-frequency = <100000>;
>  			clocks = <&ahb_clk>;
>  		};
> +
> +		tmon0: tmon@610508110 {
> +			compatible = "microchip,sparx5-temp";
> +			reg = <0x6 0x10508110 0xc>;

These nodes are all very odd with a couple of registers spread out at 
randomish addresses. DT nodes should roughly correlate to h/w blocks, 
not sets of registers for a driver like this seems to be.

Please make the dts files one patch. Reviewing a node at a time is not 
all that effective.

Rob

Re: [PATCH 2/3] arm64: dts: sparx5: Add hwmon temperature sensor

[Alexandre Belloni]

Hi Rob,

On 27/05/2020 20:29:31-0600, Rob Herring wrote:
> On Wed, May 13, 2020 at 03:41:39PM +0200, Lars Povlsen wrote:
> > This adds a hwmon temperature node sensor to the Sparx5 SoC.
> > 
> > Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> > Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
> > ---
> >  arch/arm64/boot/dts/microchip/sparx5.dtsi | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > index f09a49c41ce19..b5f2d088af30e 100644
> > --- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > +++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> > @@ -233,5 +233,11 @@ i2c1: i2c@600103000 {
> >  			clock-frequency = <100000>;
> >  			clocks = <&ahb_clk>;
> >  		};
> > +
> > +		tmon0: tmon@610508110 {
> > +			compatible = "microchip,sparx5-temp";
> > +			reg = <0x6 0x10508110 0xc>;
> 
> These nodes are all very odd with a couple of registers spread out at 
> randomish addresses. DT nodes should roughly correlate to h/w blocks, 
> not sets of registers for a driver like this seems to be.
> 

The DT nodes correlates to HW block, this and the previous families of
SoCs were designed with packed registers. There is no padding between HW
block registers.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com