hwmon: (ltc2978) Add regulator support

Add simple on/off regulator support for ltc2978 and
other pmbus parts supported by the ltc2978 driver.

Signed-off-by: Alan Tull <atull@opensource.altera.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 6e1e4935fc6226c0ec8993f56f68e8dc6ebdab3f..a674cd83a4e2ecfb4e3fbf63f31539ca933ea02b 100644 (file)
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -47,15 +47,22 @@ config SENSORS_LM25066
          be called lm25066.
 
 config SENSORS_LTC2978
-       tristate "Linear Technologies LTC2974, LTC2978, LTC3880, and LTC3883"
+       tristate "Linear Technologies LTC2978 and compatibles"
        default n
        help
          If you say yes here you get hardware monitoring support for Linear
-         Technology LTC2974, LTC2978, LTC3880, and LTC3883.
+         Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, and LTM4676.
 
          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 LTC2978 and compatibles"
+       depends on SENSORS_LTC2978 && REGULATOR
+       help
+         If you say yes here you get regulator support for Linear
+         Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, and LTM4676.
+
 config SENSORS_MAX16064
        tristate "Maxim MAX16064"
        default n

diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index e24ed521051a4a1f7b799849a5c5feee1fa6b369..0835050ec245ba67c65bd59f341b0f7eef2c3032 100644 (file)
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -22,6 +22,7 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
+#include <linux/regulator/driver.h>
 #include "pmbus.h"
 
 enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
@@ -374,6 +375,19 @@ 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", 0),
+       PMBUS_REGULATOR("vout", 1),
+       PMBUS_REGULATOR("vout", 2),
+       PMBUS_REGULATOR("vout", 3),
+       PMBUS_REGULATOR("vout", 4),
+       PMBUS_REGULATOR("vout", 5),
+       PMBUS_REGULATOR("vout", 6),
+       PMBUS_REGULATOR("vout", 7),
+};
+#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
+
 static int ltc2978_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
 {
@@ -487,13 +501,36 @@ 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;
+       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);
 }
 
-/* This is the driver that will be inserted */
+#ifdef CONFIG_OF
+static const struct of_device_id ltc2978_of_match[] = {
+       { .compatible = "lltc,ltc2974" },
+       { .compatible = "lltc,ltc2977" },
+       { .compatible = "lltc,ltc2978" },
+       { .compatible = "lltc,ltc3880" },
+       { .compatible = "lltc,ltc3883" },
+       { .compatible = "lltc,ltm4676" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, ltc2978_of_match);
+#endif
+
 static struct i2c_driver ltc2978_driver = {
        .driver = {
                   .name = "ltc2978",
+                  .of_match_table = of_match_ptr(ltc2978_of_match),
                   },
        .probe = ltc2978_probe,
        .remove = pmbus_do_remove,