From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
Add simple on/off regulator support for ltc2978 and
other pmbus parts supported by ltc2978.c
Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
v2: Remove '#include <linux/regulator/machine.h>'
Only one regulator per pmbus device
Get regulator_init_data from pdata or device tree
v3: Support multiple regulators for each chip
Move most code to pmbus_core.c
fixed values for on/off
v4: fix a #endif comment
simplify probe code, remove added switch statement
remove BUG_ON(), add error message and fix num_regulators
---
drivers/hwmon/pmbus/Kconfig | 7 +++++++
drivers/hwmon/pmbus/ltc2978.c | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 6e1e493..79117b7 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -56,6 +56,13 @@ config SENSORS_LTC2978
This driver can also be built as a module. If so, the module will
be called ltc2978.
+config SENSORS_LTC2978_REGULATOR
+ boolean "Regulator support for LTC2974, LTC2978, LTC3880, and LTC3883"
+ depends on SENSORS_LTC2978 && REGULATOR
+ help
+ If you say yes here you get regulator support for Linear
+ Technology LTC2974, LTC2978, LTC3880, and LTC3883.
+
config SENSORS_MAX16064
tristate "Maxim MAX16064"
default n
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index e24ed52..422712e 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -22,6 +22,8 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
#include "pmbus.h"
enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
@@ -374,6 +376,30 @@ static const struct i2c_device_id ltc2978_id[] = {
};
MODULE_DEVICE_TABLE(i2c, ltc2978_id);
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+static const struct regulator_desc ltc2978_reg_desc[] = {
+ PMBUS_REGULATOR("vout_en", 0),
+ PMBUS_REGULATOR("vout_en", 1),
+ PMBUS_REGULATOR("vout_en", 2),
+ PMBUS_REGULATOR("vout_en", 3),
+ PMBUS_REGULATOR("vout_en", 4),
+ PMBUS_REGULATOR("vout_en", 5),
+ PMBUS_REGULATOR("vout_en", 6),
+ PMBUS_REGULATOR("vout_en", 7),
+};
+
+static struct of_regulator_match ltc2978_reg_matches[] = {
+ { .name = "vout_en0" },
+ { .name = "vout_en1" },
+ { .name = "vout_en2" },
+ { .name = "vout_en3" },
+ { .name = "vout_en4" },
+ { .name = "vout_en5" },
+ { .name = "vout_en6" },
+ { .name = "vout_en7" },
+};
+#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
+
static int ltc2978_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -487,6 +513,17 @@ static int ltc2978_probe(struct i2c_client *client,
default:
return -ENODEV;
}
+
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+ info->num_regulators = info->pages;
+ info->reg_desc = ltc2978_reg_desc;
+ info->reg_matches = ltc2978_reg_matches;
+ if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
+ dev_err(&client->dev, "num_regulators too large!");
+ info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
+ }
+#endif
+
return pmbus_do_probe(client, id, info);
}
--
1.7.9.5
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