ASoC: ssm2518: drop support for platform data

There are currently no users of this driver's platform data in the
mainline kernel, so let's drop it.

Newer devices should use DT, ACPI, or static software properties to
describe the hardware.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/20220920025804.1788667-1-dmitry.torokhov@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/linux/platform_data/ssm2518.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * SSM2518 amplifier audio driver
- *
- * Copyright 2013 Analog Devices Inc.
- *  Author: Lars-Peter Clausen <lars@metafoo.de>
- */
-
-#ifndef __LINUX_PLATFORM_DATA_SSM2518_H__
-#define __LINUX_PLATFORM_DATA_SSM2518_H__
-
-/**
- * struct ssm2518_platform_data - Platform data for the ssm2518 driver
- * @enable_gpio: GPIO connected to the nSD pin. Set to -1 if the nSD pin is
- *            hardwired.
- */
-struct ssm2518_platform_data {
-	int enable_gpio;
-};
-
-#endif

sound/soc/codecs/ssm2518.c

@@ -13,7 +13,6 @@
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
-#include <linux/platform_data/ssm2518.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -736,7 +735,6 @@ static const struct regmap_config ssm2518_regmap_config = {
 
 static int ssm2518_i2c_probe(struct i2c_client *i2c)
 {
-	struct ssm2518_platform_data *pdata = i2c->dev.platform_data;
 	struct ssm2518 *ssm2518;
 	int ret;
 
@@ -744,9 +742,7 @@ static int ssm2518_i2c_probe(struct i2c_client *i2c)
 	if (ssm2518 == NULL)
 		return -ENOMEM;
 
-	if (pdata) {
-		ssm2518->enable_gpio = pdata->enable_gpio;
-	} else if (i2c->dev.of_node) {
+	if (i2c->dev.of_node) {
 		ssm2518->enable_gpio = of_get_gpio(i2c->dev.of_node, 0);
 		if (ssm2518->enable_gpio < 0 && ssm2518->enable_gpio != -ENOENT)
 			return ssm2518->enable_gpio;