gpio: pca9570: add a platform data structure

Add struct pca9570_platform_data for adding the platform data
structure. Also modify the existing structs for pca9570 and pca9571
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-pca9570.c

@@ -15,14 +15,26 @@
 #include <linux/mutex.h>
 #include <linux/property.h>
 
+/**
+ * struct pca9570_platform_data - GPIO platformdata
+ * @ngpio: no of gpios
+ * @command: Command to be sent
+ */
+struct pca9570_platform_data {
+	u16 ngpio;
+	u32 command;
+};
+
 /**
  * struct pca9570 - GPIO driver data
  * @chip: GPIO controller chip
+ * @p_data: GPIO controller platform data
  * @lock: Protects write sequences
  * @out: Buffer for device register
  */
 struct pca9570 {
 	struct gpio_chip chip;
+	const struct pca9570_platform_data *p_data;
 	struct mutex lock;
 	u8 out;
 };
@@ -106,7 +118,8 @@ static int pca9570_probe(struct i2c_client *client)
 	gpio->chip.get = pca9570_get;
 	gpio->chip.set = pca9570_set;
 	gpio->chip.base = -1;
-	gpio->chip.ngpio = (uintptr_t)device_get_match_data(&client->dev);
+	gpio->p_data = device_get_match_data(&client->dev);
+	gpio->chip.ngpio = gpio->p_data->ngpio;
 	gpio->chip.can_sleep = true;
 
 	mutex_init(&gpio->lock);
@@ -119,16 +132,24 @@ static int pca9570_probe(struct i2c_client *client)
 	return devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
 }
 
+static const struct pca9570_platform_data pca9570_gpio = {
+	.ngpio = 4,
+};
+
+static const struct pca9570_platform_data pca9571_gpio = {
+	.ngpio = 8,
+};
+
 static const struct i2c_device_id pca9570_id_table[] = {
-	{ "pca9570", 4 },
-	{ "pca9571", 8 },
+	{ "pca9570", (kernel_ulong_t)&pca9570_gpio},
+	{ "pca9571", (kernel_ulong_t)&pca9571_gpio },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(i2c, pca9570_id_table);
 
 static const struct of_device_id pca9570_of_match_table[] = {
-	{ .compatible = "nxp,pca9570", .data = (void *)4 },
-	{ .compatible = "nxp,pca9571", .data = (void *)8 },
+	{ .compatible = "nxp,pca9570", .data = &pca9570_gpio },
+	{ .compatible = "nxp,pca9571", .data = &pca9571_gpio },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, pca9570_of_match_table);