linux-kernel - [PATCH v1 2/3] hwmon (xdpe12284): Add support for xdpe11280

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Date:   Thu, 17 Feb 2022 10:27:29 +0100
From:   Marcello Sylvester Bauer <sylv@...v.io>
To:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        Marcello Sylvester Bauer <sylv@...v.io>,
        linux-doc@...r.kernel.org
Subject: [PATCH v1 2/3] hwmon (xdpe12284): Add support for xdpe11280

Add support for another family of Infineon Multi-phase controllers.
The xdpe11280 uses linear instead of vid data format for VOUT.
Add the required logic to detect VOUT_MODE during identification,
and set the format accordingly.

Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
---
 Documentation/hwmon/xdpe12284.rst | 10 +++++++---
 drivers/hwmon/pmbus/xdpe12284.c   | 17 ++++++++++++++++-
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/Documentation/hwmon/xdpe12284.rst b/Documentation/hwmon/xdpe12284.rst
index 67d1f87808e5..e9a5a19b0c3d 100644
--- a/Documentation/hwmon/xdpe12284.rst
+++ b/Documentation/hwmon/xdpe12284.rst
@@ -5,6 +5,10 @@ Kernel driver xdpe122
 
 Supported chips:
 
+  * Infineon XDPE11280
+
+    Prefix: 'xdpe11280'
+
   * Infineon XDPE12254
 
     Prefix: 'xdpe12254'
@@ -20,9 +24,9 @@ Authors:
 Description
 -----------
 
-This driver implements support for Infineon Multi-phase XDPE122 family
-dual loop voltage regulators.
-The family includes XDPE12284 and XDPE12254 devices.
+This driver implements support for Infineon Multi-phase XDPE112 and XDPE122
+family dual loop voltage regulators.
+These families include XDPE11280, XDPE12284 and XDPE12254 devices.
 The devices from this family complaint with:
 
 - Intel VR13 and VR13HC rev 1.3, IMVP8 rev 1.2 and IMPVP9 rev 1.3 DC-DC
diff --git a/drivers/hwmon/pmbus/xdpe12284.c b/drivers/hwmon/pmbus/xdpe12284.c
index b07da06a40c9..ec947c697670 100644
--- a/drivers/hwmon/pmbus/xdpe12284.c
+++ b/drivers/hwmon/pmbus/xdpe12284.c
@@ -27,6 +27,9 @@ static int xdpe122_read_word_data(struct i2c_client *client, int page,
 	s32 mantissa;
 	int ret;
 
+	if (info->format[PSC_VOLTAGE_OUT] == linear)
+		return -ENODATA;
+
 	switch (reg) {
 	case PMBUS_VOUT_OV_FAULT_LIMIT:
 	case PMBUS_VOUT_UV_FAULT_LIMIT:
@@ -75,9 +78,19 @@ static int xdpe122_read_word_data(struct i2c_client *client, int page,
 static int xdpe122_identify(struct i2c_client *client,
 			    struct pmbus_driver_info *info)
 {
-	u8 vout_params;
+	u8 vout_mode, vout_params;
 	int i, ret;
 
+	ret = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
+	if (ret < 0)
+		return ret;
+
+	vout_mode = ret >> 5;
+	if (vout_mode == 0) {
+		info->format[PSC_VOLTAGE_OUT] = linear;
+		return 0;
+	}
+
 	for (i = 0; i < XDPE122_PAGE_NUM; i++) {
 		/* Read the register with VOUT scaling value.*/
 		ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
@@ -140,6 +153,7 @@ static int xdpe122_probe(struct i2c_client *client)
 }
 
 static const struct i2c_device_id xdpe122_id[] = {
+	{"xdpe11280", 0},
 	{"xdpe12254", 0},
 	{"xdpe12284", 0},
 	{}
@@ -148,6 +162,7 @@ static const struct i2c_device_id xdpe122_id[] = {
 MODULE_DEVICE_TABLE(i2c, xdpe122_id);
 
 static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
+	{.compatible = "infineon,xdpe11280"},
 	{.compatible = "infineon,xdpe12254"},
 	{.compatible = "infineon,xdpe12284"},
 	{}
-- 
2.34.1