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

[ Upstream commit 2abc17a93867dc816f0ed9d32021dda8078e7330 ]

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: b76574300504 ("gpio: pca953x: Restore registers after suspend/resume cycle")
Fixes: ec82d1eba346 ("gpio: pca953x: Zap ad-hoc reg_output cache")
Fixes: 0f25fda840a9 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index f334c85..60b7616 100644 (file)
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -900,12 +900,12 @@ 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;
 
@@ -1118,14 +1118,14 @@ 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;
@@ -1135,7 +1135,7 @@ 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);
@@ -1144,7 +1144,7 @@ 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);