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>

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, },
@@ -466,6 +472,10 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
 		.compatible = "maxim,mcp980x",
 		.data = (void *)mcp980x
 	},
+	{
+		.compatible = "nxp,pct2075",
+		.data = (void *)pct2075
+	},
 	{
 		.compatible = "st,stds75",
 		.data = (void *)stds75