[PATCH v5 4/4] pmbus: ltc2978: add regulator support

atull
2014-10-02T18:44:34Z

From: Alan Tull <atull@opensource.altera.com>

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

Signed-off-by: Alan Tull <atull@opensource.altera.com>
---
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

v5: Kconfig: update list of supported chips
use "regulator: of: Provide simplified DT parsing method"
remove #include <linux/regulator/of_regulator.h>
remove of_regulator_match
---
drivers/hwmon/pmbus/Kconfig | 11 +++++++++--
drivers/hwmon/pmbus/ltc2978.c | 24 ++++++++++++++++++++++++
2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 6e1e493..a674cd8 100644
--- 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 e24ed52..efac4bf 100644
--- 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_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),
+};
+#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
+
static int ltc2978_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -487,6 +501,16 @@ 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);
}

--
1.7.9.5