hwmon: (lm75) add support for PCT2075

The NXP PCT2075 is largely compatible with other chips already supported
by the LM75 driver. It uses an 11-bit resolution and defaults to 100 ms
sampling period. The datasheet is here:

  https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf

Signed-off-by: Daniel Mack <daniel@zonque.org>
Link: https://lore.kernel.org/r/20190711124504.7580-2-daniel@zonque.org
[groeck: Documentation update]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/hwmon/lm75.rst b/Documentation/hwmon/lm75.rst
index ba8acbd..e749f82 100644 (file)
--- a/Documentation/hwmon/lm75.rst
+++ b/Documentation/hwmon/lm75.rst
@@ -119,9 +119,9 @@ Supported chips:
 
               http://www.ti.com/product/tmp275
 
-  * NXP LM75B
+  * NXP LM75B, PCT2075
 
-    Prefix: 'lm75b'
+    Prefix: 'lm75b', 'pct2075'
 
     Addresses scanned: none
 
@@ -129,6 +129,8 @@ Supported chips:
 
               http://www.nxp.com/documents/data_sheet/LM75B.pdf
 
+               http://www.nxp.com/docs/en/data-sheet/PCT2075.pdf
+
 Author: Frodo Looijaard <frodol@dds.nl>
 
 Description

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index cbabab7..0cd1447 100644 (file)
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -36,6 +36,7 @@ enum lm75_type {              /* keep sorted in alphabetical order */
        max6626,
        max31725,
        mcp980x,
+       pct2075,
        stds75,
        stlm75,
        tcn75,
@@ -317,6 +318,10 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
                data->resolution = 9;
                data->sample_time = MSEC_PER_SEC / 8;
                break;
+       case pct2075:
+               data->resolution = 11;
+               data->sample_time = MSEC_PER_SEC / 10;
+               break;
        case mcp980x:
                data->resolution_limits = 9;
                /* fall through */
@@ -397,6 +402,7 @@ static const struct i2c_device_id lm75_ids[] = {
        { "max31725", max31725, },
        { "max31726", max31725, },
        { "mcp980x", mcp980x, },
+       { "pct2075", pct2075, },
        { "stds75", stds75, },
        { "stlm75", stlm75, },
        { "tcn75", tcn75, },
@@ -467,6 +473,10 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
                .data = (void *)mcp980x
        },
        {
+               .compatible = "nxp,pct2075",
+               .data = (void *)pct2075
+       },
+       {
                .compatible = "st,stds75",
                .data = (void *)stds75
        },