gpio: pca953x: add more register definitions for pcal953x

PCAL chips ("L" seems to stand for "latched") have additional
registers starting at address 0x40 to control the latches,
interrupt mask, pull-up and pull down etc.
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-pca953x.c

@@ -41,9 +41,13 @@
 #define PCA957X_MSK		0x06
 #define PCA957X_INTS		0x07
 
+#define PCAL953X_OUT_STRENGTH	0x20
 #define PCAL953X_IN_LATCH	0x22
+#define PCAL953X_PULL_EN	0x23
+#define PCAL953X_PULL_SEL	0x24
 #define PCAL953X_INT_MASK	0x25
 #define PCAL953X_INT_STAT	0x26
+#define PCAL953X_OUT_CONF	0x27
 
 #define PCA_GPIO_MASK		0x00FF
 #define PCA_INT			0x0100