hwmon: (pmbus/zl6100) Add support for ZL2005

Add explicit support for ZL2005. Functionality is almost the same as with other
Zilker Labs / Intersil chips, but limit register detection does not work reliably.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

2 files changed, 19 insertions, 4 deletions

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 4b26f51920ba..d357ab280263 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -113,8 +113,8 @@ config SENSORS_ZL6100
         default n
         help
           If you say yes here you get hardware monitoring support for Intersil
-          ZL2004, ZL2006, ZL2008, ZL2105, ZL2106, ZL6100, and ZL6105 Digital
-          DC/DC Controllers.
+          ZL2004, ZL2005, ZL2006, ZL2008, ZL2105, ZL2106, ZL6100, and ZL6105
+          Digital DC/DC Controllers.
 
           This driver can also be built as a module. If so, the module will
           be called zl6100.
diff --git a/drivers/hwmon/pmbus/zl6100.c b/drivers/hwmon/pmbus/zl6100.c
index 2bc980006f83..d78bdcf467f3 100644
--- a/drivers/hwmon/pmbus/zl6100.c
+++ b/drivers/hwmon/pmbus/zl6100.c
@@ -28,7 +28,7 @@
 #include <linux/delay.h>
 #include "pmbus.h"
 
-enum chips { zl2004, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 };
+enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105 };
 
 struct zl6100_data {
         int id;
@@ -65,6 +65,19 @@ static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
         if (page || reg >= PMBUS_VIRT_BASE)
                 return -ENXIO;
 
+        if (data->id == zl2005) {
+                /*
+                 * Limit register detection is not reliable on ZL2005.
+                 * Make sure registers are not erroneously detected.
+                 */
+                switch (reg) {
+                case PMBUS_VOUT_OV_WARN_LIMIT:
+                case PMBUS_VOUT_UV_WARN_LIMIT:
+                case PMBUS_IOUT_OC_WARN_LIMIT:
+                        return -ENXIO;
+                }
+        }
+
         zl6100_wait(data);
         ret = pmbus_read_word_data(client, page, reg);
         data->access = ktime_get();
@@ -123,6 +136,7 @@ static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
 
 static const struct i2c_device_id zl6100_id[] = {
         {"zl2004", zl2004},
+        {"zl2005", zl2005},
         {"zl2006", zl2006},
         {"zl2008", zl2008},
         {"zl2105", zl2105},
@@ -177,8 +191,9 @@ static int zl6100_probe(struct i2c_client *client,
         data->id = mid->driver_data;
 
         /*
-         * ZL2008, ZL2105, and ZL6100 are known to require a wait time
+         * ZL2005, ZL2008, ZL2105, and ZL6100 are known to require a wait time
          * between I2C accesses. ZL2004 and ZL6105 are known to be safe.
+         * Other chips have not yet been tested.
          *
          * Only clear the wait time for chips known to be safe. The wait time
          * can be cleared later for additional chips if tests show that it