[PATCH 10/10] hwmon: (ds620) Drop platform data support

[Guenter Roeck <linux@roeck-us.net>]

There are no in-tree users of ds620_platform_data. Without platform
data, the driver clears PO2 to keep the thermostat output pin low,
which is the default valid configuration.

Drop platform data support from the driver, remove the unused
platform_data header file, and update the driver documentation.

Cc: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 Documentation/hwmon/ds620.rst       | 12 +-----------
 drivers/hwmon/ds620.c               | 13 ++-----------
 include/linux/platform_data/ds620.h | 22 ----------------------
 3 files changed, 3 insertions(+), 44 deletions(-)
 delete mode 100644 include/linux/platform_data/ds620.h

diff --git a/Documentation/hwmon/ds620.rst b/Documentation/hwmon/ds620.rst
index e2d915a988a2..6a18ecea5c4f 100644
--- a/Documentation/hwmon/ds620.rst
+++ b/Documentation/hwmon/ds620.rst
@@ -25,14 +25,4 @@ into non-volatile on-chip registers). Temperature range is -55 degree Celsius
 to +125. Between 0 and 70 degree Celsius, accuracy is 0.5 Kelvin. The value
 returned via sysfs displays post decimal positions.
 
-The thermostat function works as follows: When configured via platform_data
-(struct ds620_platform_data) .pomode == 0 (default), the thermostat output pin
-PO is always low. If .pomode == 1, the thermostat is in PO_LOW mode. I.e., the
-output pin PO becomes active when the temperature falls below temp1_min and
-stays active until the temperature goes above temp1_max.
-
-Likewise, with .pomode == 2, the thermostat is in PO_HIGH mode. I.e., the PO
-output pin becomes active when the temperature goes above temp1_max and stays
-active until the temperature falls below temp1_min.
-
-The PO output pin of the DS620 operates active-low.
+The thermostat output pin PO is configured to be always low.
diff --git a/drivers/hwmon/ds620.c b/drivers/hwmon/ds620.c
index efb005bedabb..17ae9cc72761 100644
--- a/drivers/hwmon/ds620.c
+++ b/drivers/hwmon/ds620.c
@@ -17,7 +17,6 @@
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/sysfs.h>
-#include <linux/platform_data/ds620.h>
 
 /*
  * Many DS620 constants specified below
@@ -64,7 +63,6 @@ struct ds620_data {
 
 static void ds620_init_client(struct i2c_client *client)
 {
-	struct ds620_platform_data *ds620_info = dev_get_platdata(&client->dev);
 	u16 conf, new_conf;
 
 	new_conf = conf =
@@ -72,15 +70,8 @@ static void ds620_init_client(struct i2c_client *client)
 
 	/* switch to continuous conversion mode */
 	new_conf &= ~DS620_REG_CONFIG_1SHOT;
-	/* already high at power-on, but don't trust the BIOS! */
-	new_conf |= DS620_REG_CONFIG_PO2;
-	/* thermostat mode according to platform data */
-	if (ds620_info && ds620_info->pomode == 1)
-		new_conf &= ~DS620_REG_CONFIG_PO1; /* PO_LOW */
-	else if (ds620_info && ds620_info->pomode == 2)
-		new_conf |= DS620_REG_CONFIG_PO1; /* PO_HIGH */
-	else
-		new_conf &= ~DS620_REG_CONFIG_PO2; /* always low */
+	/* thermostat output pin always low */
+	new_conf &= ~DS620_REG_CONFIG_PO2;
 	/* with highest precision */
 	new_conf |= DS620_REG_CONFIG_R1 | DS620_REG_CONFIG_R0;
 
diff --git a/include/linux/platform_data/ds620.h b/include/linux/platform_data/ds620.h
deleted file mode 100644
index f0ce22a78bb8..000000000000
--- a/include/linux/platform_data/ds620.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_DS620_H
-#define _LINUX_DS620_H
-
-#include <linux/types.h>
-#include <linux/i2c.h>
-
-/* platform data for the DS620 temperature sensor and thermostat */
-
-struct ds620_platform_data {
-	/*
-	 *  Thermostat output pin PO mode:
-	 *  0 = always low (default)
-	 *  1 = PO_LOW
-	 *  2 = PO_HIGH
-	 *
-	 * (see Documentation/hwmon/ds620.rst)
-	 */
-	int pomode;
-};
-
-#endif /* _LINUX_DS620_H */
-- 
2.45.2