Re: [PATCH] hwmon: (pmbus/tda38640) Add driver for Infineon TDA38640 Voltage Regulator

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Hi

On 24-01-2023 04:40 pm, Krzysztof Kozlowski wrote:
On 24/01/2023 12:01, Naresh Solanki wrote:
From: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>

Add the pmbus driver for the Infineon TDA38640 voltage regulator.

Signed-off-by: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
Signed-off-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
---
  .../devicetree/bindings/trivial-devices.yaml  |  2 +

Split bindings from driver code.
Sure

  drivers/hwmon/pmbus/Kconfig                   | 16 ++++
  drivers/hwmon/pmbus/Makefile                  |  1 +
  drivers/hwmon/pmbus/tda38640.c                | 78 +++++++++++++++++++
  4 files changed, 97 insertions(+)
  create mode 100644 drivers/hwmon/pmbus/tda38640.c

diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
index f5c0a6283e61..a28b02036489 100644
--- a/Documentation/devicetree/bindings/trivial-devices.yaml
+++ b/Documentation/devicetree/bindings/trivial-devices.yaml
@@ -141,6 +141,8 @@ properties:
            - infineon,slb9645tt
              # Infineon SLB9673 I2C TPM 2.0
            - infineon,slb9673
+            # Infineon TDA38640 Voltage Regulator
+          - infineon,tda38640
              # Infineon TLV493D-A1B6 I2C 3D Magnetic Sensor
            - infineon,tlv493d-a1b6
              # Infineon Multi-phase Digital VR Controller xdpe11280
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 30448e049486..9f4bbb9c487a 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -395,6 +395,22 @@ config SENSORS_STPDDC60
  	  This driver can also be built as a module. If so, the module will
  	  be called stpddc60.
+config SENSORS_TDA38640
+	tristate "Infineon TDA38640"
+	help
+	  If you say yes here you get hardware monitoring support for Infineon
+	  TDA38640.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tda38640.
+
+config SENSORS_TDA38640_REGULATOR
+	bool "Regulator support for TDA38640 and compatibles"
+	depends on SENSORS_TDA38640 && REGULATOR
+	help
+	  If you say yes here you get regulator support for Infineon
+	  TDA38640 as regulator.

Drop entire option, why is it needed?
You mean regulator option ?
This is how other pmbus regulator devices have provided option.

+
  config SENSORS_TPS40422
  	tristate "TI TPS40422"
  	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index d9d2fa4bd6f7..3ae019916267 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
  obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
  obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
  obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
+obj-$(CONFIG_SENSORS_TDA38640)	+= tda38640.o
  obj-$(CONFIG_SENSORS_TPS40422)	+= tps40422.o
  obj-$(CONFIG_SENSORS_TPS53679)	+= tps53679.o
  obj-$(CONFIG_SENSORS_TPS546D24)	+= tps546d24.o
diff --git a/drivers/hwmon/pmbus/tda38640.c b/drivers/hwmon/pmbus/tda38640.c
new file mode 100644
index 000000000000..31e17a936b8c
--- /dev/null
+++ b/drivers/hwmon/pmbus/tda38640.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for Infineon TDA38640
+ *
+ * Copyright (c) 2023 9elements GmbH
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/driver.h>
+#include "pmbus.h"
+
+#if IS_ENABLED(CONFIG_SENSORS_TDA38640_REGULATOR)
+static const struct regulator_desc tda38640_reg_desc[] = {
+	PMBUS_REGULATOR("vout", 0),
+};
+#endif /* CONFIG_SENSORS_TDA38640_REGULATOR */
+
+static struct pmbus_driver_info tda38640_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.format[PSC_CURRENT_IN] = linear,
+	.format[PSC_POWER] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
+	    | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
+	    | PMBUS_HAVE_IIN
+	    | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+	    | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
+	    | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN,
+#if IS_ENABLED(CONFIG_SENSORS_TDA38640_REGULATOR)
+	.num_regulators = 1,
+	.reg_desc = tda38640_reg_desc,
+#endif
+};
+
+static int tda38640_probe(struct i2c_client *client)
+{
+	return pmbus_do_probe(client, &tda38640_info);
+}
+
+static const struct i2c_device_id tda38640_id[] = {
+	{"tda38640", 0},
+	{}
+};
+

Drop blank line
Sure

+MODULE_DEVICE_TABLE(i2c, tda38640_id);
+
+#ifdef CONFIG_OF

Drop ifdefs and use __maybe_unused

+static const struct of_device_id tda38640_of_match[] = {
+	{ .compatible = "infineon,tda38640"},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, tda38640_of_match);

Where is it used? You miss the user.
I'm not sure if I get your question right.
This chip is used in sbp1 board to power CPU rails.

+#endif
+
+/* This is the driver that will be inserted */
+static struct i2c_driver tda38640_driver = {
+	.driver = {
+		   .name = "tda38640",
+		   },
+	.probe_new = tda38640_probe,
+	.id_table = tda38640_id,
+};

Best regards,
Krzysztof


Best regards,
Naresh



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