[PATCH 05/10] hwmon: (ltc4245) Drop platform data support

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

There are no in-tree users of ltc4245_platform_data. Sampling all GPIO
pins as analog voltages is already configurable via the
"ltc4245,use-extra-gpios" devicetree property.

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/ltc4245.rst       |  6 ++----
 drivers/hwmon/ltc4245.c               | 21 +++------------------
 include/linux/platform_data/ltc4245.h | 17 -----------------
 3 files changed, 5 insertions(+), 39 deletions(-)
 delete mode 100644 include/linux/platform_data/ltc4245.h

diff --git a/Documentation/hwmon/ltc4245.rst b/Documentation/hwmon/ltc4245.rst
index 3dafd08a4e87..0c3b823169b9 100644
--- a/Documentation/hwmon/ltc4245.rst
+++ b/Documentation/hwmon/ltc4245.rst
@@ -103,9 +103,7 @@ then they will be sampled in round-robin fashion. If userspace reads too
 slowly, -EAGAIN will be returned when you read the sysfs attribute containing
 the sensor reading.
 
-The LTC4245 chip can be configured to sample all GPIO pins with two methods:
-
-1) platform data -- see include/linux/platform_data/ltc4245.h
-2) OF device tree -- add the "ltc4245,use-extra-gpios" property to each chip
+The LTC4245 chip can be configured to sample all GPIO pins by adding the
+"ltc4245,use-extra-gpios" OF device tree property to each chip.
 
 The default mode of operation is to sample a single GPIO pin.
diff --git a/drivers/hwmon/ltc4245.c b/drivers/hwmon/ltc4245.c
index e7fcf607a05e..7425c801cfe5 100644
--- a/drivers/hwmon/ltc4245.c
+++ b/drivers/hwmon/ltc4245.c
@@ -19,7 +19,7 @@
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
 #include <linux/jiffies.h>
-#include <linux/platform_data/ltc4245.h>
+#include <linux/of.h>
 
 /* Here are names of the chip's registers (a.k.a. commands) */
 enum ltc4245_cmd {
@@ -418,22 +418,6 @@ static const struct hwmon_chip_info ltc4245_chip_info = {
 	.info = ltc4245_info,
 };
 
-static bool ltc4245_use_extra_gpios(struct i2c_client *client)
-{
-	struct ltc4245_platform_data *pdata = dev_get_platdata(&client->dev);
-	struct device_node *np = client->dev.of_node;
-
-	/* prefer platform data */
-	if (pdata)
-		return pdata->use_extra_gpios;
-
-	/* fallback on OF */
-	if (of_property_read_bool(np, "ltc4245,use-extra-gpios"))
-		return true;
-
-	return false;
-}
-
 static int ltc4245_probe(struct i2c_client *client)
 {
 	struct i2c_adapter *adapter = client->adapter;
@@ -448,7 +432,8 @@ static int ltc4245_probe(struct i2c_client *client)
 		return -ENOMEM;
 
 	data->client = client;
-	data->use_extra_gpios = ltc4245_use_extra_gpios(client);
+	data->use_extra_gpios = of_property_read_bool(client->dev.of_node,
+						      "ltc4245,use-extra-gpios");
 
 	/* Initialize the LTC4245 chip */
 	i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00);
diff --git a/include/linux/platform_data/ltc4245.h b/include/linux/platform_data/ltc4245.h
deleted file mode 100644
index f07fa05ea6c4..000000000000
--- a/include/linux/platform_data/ltc4245.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Platform Data for LTC4245 hardware monitor chip
- *
- * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
- */
-
-#ifndef LINUX_LTC4245_H
-#define LINUX_LTC4245_H
-
-#include <linux/types.h>
-
-struct ltc4245_platform_data {
-	bool use_extra_gpios;
-};
-
-#endif /* LINUX_LTC4245_H */
-- 
2.45.2