gpio: pca953x: use the correct range when do regmap sync

regmap will sync a range of registers, here use the correct range
to make sure the sync do not touch other unexpected registers.

Find on pca9557pw on imx8qxp/dxl evk board, this device support
8 pin, so only need one register(8 bits) to cover all the 8 pins's
property setting. But when sync the output, we find it actually
update two registers, output register and the following register.

Fixes: b7657430 ("gpio: pca953x: Restore registers after suspend/resume cycle")
Fixes: ec82d1eb ("gpio: pca953x: Zap ad-hoc reg_output cache")
Fixes: 0f25fda8 ("gpio: pca953x: Zap ad-hoc reg_direction cache")
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

drivers/gpio/gpio-pca953x.c

@@ -912,12 +912,12 @@ static int device_pca95xx_init(struct pca953x_chip *chip, u32 invert)
 	int ret;
 
 	ret = regcache_sync_region(chip->regmap, chip->regs->output,
-				   chip->regs->output + NBANK(chip));
+				   chip->regs->output + NBANK(chip) - 1);
 	if (ret)
 		goto out;
 
 	ret = regcache_sync_region(chip->regmap, chip->regs->direction,
-				   chip->regs->direction + NBANK(chip));
+				   chip->regs->direction + NBANK(chip) - 1);
 	if (ret)
 		goto out;
 
@@ -1130,14 +1130,14 @@ static int pca953x_regcache_sync(struct device *dev)
 	 * sync these registers first and only then sync the rest.
 	 */
 	regaddr = pca953x_recalc_addr(chip, chip->regs->direction, 0);
-	ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip));
+	ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
 	if (ret) {
 		dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret);
 		return ret;
 	}
 
 	regaddr = pca953x_recalc_addr(chip, chip->regs->output, 0);
-	ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip));
+	ret = regcache_sync_region(chip->regmap, regaddr, regaddr + NBANK(chip) - 1);
 	if (ret) {
 		dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret);
 		return ret;
@@ -1147,7 +1147,7 @@ static int pca953x_regcache_sync(struct device *dev)
 	if (chip->driver_data & PCA_PCAL) {
 		regaddr = pca953x_recalc_addr(chip, PCAL953X_IN_LATCH, 0);
 		ret = regcache_sync_region(chip->regmap, regaddr,
-					   regaddr + NBANK(chip));
+					   regaddr + NBANK(chip) - 1);
 		if (ret) {
 			dev_err(dev, "Failed to sync INT latch registers: %d\n",
 				ret);
@@ -1156,7 +1156,7 @@ static int pca953x_regcache_sync(struct device *dev)
 
 		regaddr = pca953x_recalc_addr(chip, PCAL953X_INT_MASK, 0);
 		ret = regcache_sync_region(chip->regmap, regaddr,
-					   regaddr + NBANK(chip));
+					   regaddr + NBANK(chip) - 1);
 		if (ret) {
 			dev_err(dev, "Failed to sync INT mask registers: %d\n",
 				ret);