gpio: pca953x: Drop unused fields in struct pca953x_platform_data

JIRA: https://issues.redhat.com/browse/RHEL-35606
Conflicts: Due to missing
           ed5c2f5 ("i2c: Make remove callback return void"),
           we must still return 0.

commit 2f4d3e2
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date:   Fri Sep 1 16:40:32 2023 +0300

    gpio: pca953x: Drop unused fields in struct pca953x_platform_data

    New code should solely use firmware nodes for the specifics and
    not any callbacks.

    Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
    Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Signed-off-by: Andrew Halaney <ahalaney@redhat.com>

Author: ahalaney

drivers/gpio/gpio-pca953x.c

@@ -211,7 +211,6 @@ struct pca953x_chip {
 
 	struct i2c_client *client;
 	struct gpio_chip gpio_chip;
-	const char *const *names;
 	unsigned long driver_data;
 	struct regulator *regulator;
 
@@ -712,7 +711,6 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 	gc->label = dev_name(&chip->client->dev);
 	gc->parent = &chip->client->dev;
 	gc->owner = THIS_MODULE;
-	gc->names = chip->names;
 }
 
 #ifdef CONFIG_GPIO_PCA953X_IRQ
@@ -998,7 +996,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
 }
 #endif
 
-static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
+static int device_pca95xx_init(struct pca953x_chip *chip)
 {
 	DECLARE_BITMAP(val, MAX_LINE);
 	u8 regaddr;
@@ -1016,24 +1014,21 @@ static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
 	if (ret)
 		goto out;
 
-	/* set platform specific polarity inversion */
-	if (invert)
-		bitmap_fill(val, MAX_LINE);
-	else
-		bitmap_zero(val, MAX_LINE);
+	/* clear polarity inversion */
+	bitmap_zero(val, MAX_LINE);
 
 	ret = pca953x_write_regs(chip, chip->regs->invert, val);
 out:
 	return ret;
 }
 
-static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
+static int device_pca957x_init(struct pca953x_chip *chip)
 {
 	DECLARE_BITMAP(val, MAX_LINE);
 	unsigned int i;
 	int ret;
 
-	ret = device_pca95xx_init(chip, invert);
+	ret = device_pca95xx_init(chip);
 	if (ret)
 		goto out;
 
@@ -1055,9 +1050,8 @@ static int pca953x_probe(struct i2c_client *client)
 	const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client);
 	struct pca953x_platform_data *pdata;
 	struct pca953x_chip *chip;
-	int irq_base = 0;
+	int irq_base;
 	int ret;
-	u32 invert = 0;
 	struct regulator *reg;
 	const struct regmap_config *regmap_config;
 
@@ -1069,8 +1063,6 @@ static int pca953x_probe(struct i2c_client *client)
 	if (pdata) {
 		irq_base = pdata->irq_base;
 		chip->gpio_start = pdata->gpio_base;
-		invert = pdata->invert;
-		chip->names = pdata->names;
 	} else {
 		struct gpio_desc *reset_gpio;
 
@@ -1170,10 +1162,10 @@ static int pca953x_probe(struct i2c_client *client)
 	 */
 	if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
 		chip->regs = &pca957x_regs;
-		ret = device_pca957x_init(chip, invert);
+		ret = device_pca957x_init(chip);
 	} else {
 		chip->regs = &pca953x_regs;
-		ret = device_pca95xx_init(chip, invert);
+		ret = device_pca95xx_init(chip);
 	}
 	if (ret)
 		goto err_exit;
@@ -1186,13 +1178,6 @@ static int pca953x_probe(struct i2c_client *client)
 	if (ret)
 		goto err_exit;
 
-	if (pdata && pdata->setup) {
-		ret = pdata->setup(client, chip->gpio_chip.base,
-				   chip->gpio_chip.ngpio, pdata->context);
-		if (ret < 0)
-			dev_warn(&client->dev, "setup failed, %d\n", ret);
-	}
-
 	return 0;
 
 err_exit:
@@ -1202,14 +1187,8 @@ static int pca953x_probe(struct i2c_client *client)
 
 static int pca953x_remove(struct i2c_client *client)
 {
-	struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct pca953x_chip *chip = i2c_get_clientdata(client);
 
-	if (pdata && pdata->teardown) {
-		pdata->teardown(client, chip->gpio_chip.base,
-				chip->gpio_chip.ngpio, pdata->context);
-	}
-
 	regulator_disable(chip->regulator);
 
 	return 0;

include/linux/platform_data/pca953x.h

@@ -11,21 +11,8 @@ struct pca953x_platform_data {
 	/* number of the first GPIO */
 	unsigned	gpio_base;
 
-	/* initial polarity inversion setting */
-	u32		invert;
-
 	/* interrupt base */
 	int		irq_base;
-
-	void		*context;	/* param to setup/teardown */
-
-	int		(*setup)(struct i2c_client *client,
-				unsigned gpio, unsigned ngpio,
-				void *context);
-	void		(*teardown)(struct i2c_client *client,
-				unsigned gpio, unsigned ngpio,
-				void *context);
-	const char	*const *names;
 };
 
 #endif /* _LINUX_PCA953X_H */