recipes-kernel/linux/5.15/0001-Add-STEF48H28-driver.patch

From 0cd9db4531769ad522dc0aca6def1884cfbe0826 Mon Sep 17 00:00:00 2001
From: Charles Hsu <charles.hsu@quanta.corp-partner.google.com>
Date: Wed, 20 Aug 2025 05:22:42 +0000
Subject: [PATCH] Add STEF48H28 driver

---
 drivers/hwmon/pmbus/Kconfig     |  9 ++++
 drivers/hwmon/pmbus/Makefile    |  1 +
 drivers/hwmon/pmbus/stef48h28.c | 77 +++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 drivers/hwmon/pmbus/stef48h28.c

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index e6a7daf761e3..9556ebc3ce02 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -340,6 +340,15 @@ config SENSORS_Q54SJ108A2
 	  This driver can also be built as a module. If so, the module will
 	  be called q54sj108a2.
 
+config SENSORS_STEF48H28
+    tristate "ST STEF48H28"
+   help
+     If you say yes here you get hardware monitoring support for ST
+     STEF48H28.
+
+     This driver can also be built as a module. If so, the module will
+     be called stef48h28.
+
 config SENSORS_STPDDC60
 	tristate "ST STPDDC60"
 	help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 9029ff89daf6..b7ec2ddd5b22 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_SENSORS_MPQ8785)	+= mpq8785.o
 obj-$(CONFIG_SENSORS_PM6764TR)	+= pm6764tr.o
 obj-$(CONFIG_SENSORS_PXE1610)	+= pxe1610.o
 obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
+obj-$(CONFIG_SENSORS_STEF48H28)    += stef48h28.o
 obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
 obj-$(CONFIG_SENSORS_TDA38740) += tda38740.o
 obj-$(CONFIG_SENSORS_TPS40422)	+= tps40422.o
diff --git a/drivers/hwmon/pmbus/stef48h28.c b/drivers/hwmon/pmbus/stef48h28.c
new file mode 100644
index 000000000000..88437a6ec803
--- /dev/null
+++ b/drivers/hwmon/pmbus/stef48h28.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for STMicroelectronics digital controller stef48h28
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info stef48h28_info = {
+   .pages = 1,
+   .format[PSC_VOLTAGE_IN] = direct,
+   .format[PSC_VOLTAGE_OUT] = direct,
+    .format[PSC_CURRENT_IN] = direct,
+   .format[PSC_CURRENT_OUT] = direct,
+   .format[PSC_POWER] = direct,
+    .format[PSC_TEMPERATURE] = direct,
+    .m[PSC_VOLTAGE_IN] = 50,
+   .b[PSC_VOLTAGE_IN] = 0,
+   .R[PSC_VOLTAGE_IN] = 0,
+   .m[PSC_VOLTAGE_OUT] = 50,
+   .b[PSC_VOLTAGE_OUT] = 0,
+   .R[PSC_VOLTAGE_OUT] = 0,
+   .m[PSC_CURRENT_IN] = 100,
+   .b[PSC_CURRENT_IN] = 0,
+   .R[PSC_CURRENT_IN] = 0,
+   .m[PSC_CURRENT_OUT] = 100,
+   .b[PSC_CURRENT_OUT] = 0,
+   .R[PSC_CURRENT_OUT] = 0,
+   .m[PSC_POWER] = 9765,
+   .b[PSC_POWER] = 0,
+   .R[PSC_POWER] = -3,
+   .m[PSC_TEMPERATURE] = 25,
+   .b[PSC_TEMPERATURE] = 500,
+   .R[PSC_TEMPERATURE] = 0,
+   .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
+       | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
+       | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
+       | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT
+};
+
+static int stef48h28_probe(struct i2c_client *client)
+{
+   return pmbus_do_probe(client, &stef48h28_info);
+}
+
+static const struct i2c_device_id stef48h28_id[] = {
+   {"stef48h28"},
+   {}
+};
+MODULE_DEVICE_TABLE(i2c, stef48h28_id);
+
+static const struct of_device_id __maybe_unused stef48h28_of_match[] = {
+   {.compatible = "st,stef48h28"},
+   {}
+};
+
+/* This is the driver that will be inserted */
+static struct i2c_driver stef48h28_driver = {
+   .driver = {
+          .name = "stef48h28",
+          .of_match_table = of_match_ptr(stef48h28_of_match),
+          },
+   .probe_new = stef48h28_probe,
+   .id_table = stef48h28_id,
+};
+
+module_i2c_driver(stef48h28_driver);
+
+MODULE_AUTHOR("Charles Hsu <ythsu0511@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for ST stef48h28");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);
-- 
2.34.1