gpio: pca953x: Add NXP PCA9698

Add the NXP PCA9698 40-bit GPIO expander to the supported list.
Note: This only enables GPIO functionality.
Tested-by: NBob Schmitz <bschmitz@xes-inc.com>
Signed-off-by: NAaron Sierra <asierra@xes-inc.com>
Acked-by: NGraeme Smecher <gsmecher@threespeedlogic.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/Kconfig

@@ -461,7 +461,7 @@ config GPIO_MC9S08DZ60
 	  Select this to enable the MC9S08DZ60 GPIO driver
 
 config GPIO_PCA953X
-	tristate "PCA953x, PCA955x, PCA957x, TCA64xx, and MAX7310 I/O ports"
+	tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
 	depends on I2C
 	help
 	  Say yes here to provide access to several register-oriented
@@ -478,7 +478,7 @@ config GPIO_PCA953X
 
 	  24 bits:	tca6424
 
-	  40 bits:	pca9505
+	  40 bits:	pca9505, pca9698
 
 config GPIO_PCA953X_IRQ
 	bool "Interrupt controller support for PCA953x"

drivers/gpio/gpio-pca953x.c

@@ -59,6 +59,7 @@ static const struct i2c_device_id pca953x_id[] = {
 	{ "pca9557", 8  | PCA953X_TYPE, },
 	{ "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
 	{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
+	{ "pca9698", 40 | PCA953X_TYPE, },
 
 	{ "max7310", 8  | PCA953X_TYPE, },
 	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
@@ -812,6 +813,7 @@ static const struct of_device_id pca953x_dt_ids[] = {
 	{ .compatible = "nxp,pca9557", },
 	{ .compatible = "nxp,pca9574", },
 	{ .compatible = "nxp,pca9575", },
+	{ .compatible = "nxp,pca9698", },
 
 	{ .compatible = "maxim,max7310", },
 	{ .compatible = "maxim,max7312", },