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Message-Id: <20241026-add-ltc2971-v1-1-109ec21687bc@gmail.com>
Date: Sat, 26 Oct 2024 11:08:44 +0200
From: Patryk Biel <pbiel7@...il.com>
To: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Frank Li <Frank.Li@....com>
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Patryk Biel <pbiel7@...il.com>
Subject: [PATCH 1/2] hwmon: pmbus: Add support for ltc2971
LTC2971 is a power manager similar to already supported LTC2972,
it uses the same register set but supports a different voltage range.
Signed-off-by: Patryk Biel <pbiel7@...il.com>
---
drivers/hwmon/pmbus/ltc2978.c | 34 +++++++++++++++++++++++++++++++---
1 file changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index 73a86f4d647288be97615f19a5c6314e4036e6a3..681e7b811dbcc263fe8f5e4f9da30fcbc7e019ad 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -21,7 +21,8 @@
enum chips {
/* Managers */
- ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980,
+ ltc2971, ltc2972, ltc2974, ltc2975, ltc2977, ltc2978,
+ ltc2979, ltc2980,
/* Controllers */
ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, ltc3889, ltc7132, ltc7880,
/* Modules */
@@ -61,6 +62,7 @@ enum chips {
#define LTC2978_ID_MASK 0xfff0
+#define LTC2971_ID 0x0320
#define LTC2972_ID 0x0310
#define LTC2974_ID 0x0210
#define LTC2975_ID 0x0220
@@ -533,6 +535,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
}
static const struct i2c_device_id ltc2978_id[] = {
+ {"ltc2971", ltc2971},
{"ltc2972", ltc2972},
{"ltc2974", ltc2974},
{"ltc2975", ltc2975},
@@ -564,11 +567,19 @@ MODULE_DEVICE_TABLE(i2c, ltc2978_id);
#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
#define LTC2978_ADC_RES 0xFFFF
+#define LTC2978_UV_STEP 1000
+
+/* Common for most chips */
#define LTC2978_N_ADC 122
#define LTC2978_MAX_UV (LTC2978_ADC_RES * LTC2978_N_ADC)
-#define LTC2978_UV_STEP 1000
#define LTC2978_N_VOLTAGES ((LTC2978_MAX_UV / LTC2978_UV_STEP) + 1)
+/* LTC2971 */
+#define LTC2971_N_ADC 4500
+#define LTC2971_MAX_UV (LTC2978_ADC_RES * LTC2971_N_ADC)
+#define LTC2971_N_VOLTAGES ((LTC2971_MAX_UV / LTC2978_UV_STEP) + 1)
+
+/* Common for most chips */
static const struct regulator_desc ltc2978_reg_desc[] = {
PMBUS_REGULATOR_STEP("vout", 0, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 1, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
@@ -580,6 +591,12 @@ static const struct regulator_desc ltc2978_reg_desc[] = {
PMBUS_REGULATOR_STEP("vout", 7, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
};
+/* LTC2971 */
+static const struct regulator_desc ltc2971_reg_desc[] = {
+ PMBUS_REGULATOR_STEP("vout", 0, LTC2971_N_VOLTAGES, LTC2978_UV_STEP, 0),
+ PMBUS_REGULATOR_STEP("vout", 1, LTC2971_N_VOLTAGES, LTC2978_UV_STEP, 0),
+};
+
static const struct regulator_desc ltc2978_reg_desc_default[] = {
PMBUS_REGULATOR("vout", 0),
PMBUS_REGULATOR("vout", 1),
@@ -624,7 +641,9 @@ static int ltc2978_get_id(struct i2c_client *client)
chip_id &= LTC2978_ID_MASK;
- if (chip_id == LTC2972_ID)
+ if (chip_id == LTC2971_ID)
+ return ltc2971;
+ else if (chip_id == LTC2972_ID)
return ltc2972;
else if (chip_id == LTC2974_ID)
return ltc2974;
@@ -731,6 +750,7 @@ static int ltc2978_probe(struct i2c_client *client)
data->temp2_max = 0x7c00;
switch (data->id) {
+ case ltc2971:
case ltc2972:
info->read_word_data = ltc2975_read_word_data;
info->pages = LTC2972_NUM_PAGES;
@@ -861,6 +881,13 @@ static int ltc2978_probe(struct i2c_client *client)
#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
info->num_regulators = info->pages;
switch (data->id) {
+ case ltc2971:
+ info->reg_desc = ltc2971_reg_desc;
+ if (info->num_regulators > ARRAY_SIZE(ltc2971_reg_desc)) {
+ dev_warn(&client->dev, "num_regulators too large!");
+ info->num_regulators = ARRAY_SIZE(ltc2971_reg_desc);
+ }
+ break;
case ltc2972:
case ltc2974:
case ltc2975:
@@ -892,6 +919,7 @@ static int ltc2978_probe(struct i2c_client *client)
#ifdef CONFIG_OF
static const struct of_device_id ltc2978_of_match[] = {
+ { .compatible = "lltc,ltc2971" },
{ .compatible = "lltc,ltc2972" },
{ .compatible = "lltc,ltc2974" },
{ .compatible = "lltc,ltc2975" },
--
2.43.0
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