gpio: pca953x: Correctly initialize registers 6 and 7 for PCA957x

[ Upstream commit 8c1f1c34777bddb633d4a068a9c812d29974c6bd ]

When driver has been converted to the bitmap API the non-bitmap functions
started behaving differently on 32-bit BE architectures since the bytes in
two consequent unsigned longs are in different order in comparison to byte
array. Hence if the chip had had more than 32 lines the memset() call over
it would have not set up upper lines correctly.
Although it's currently a theoretical case (no supported chips of this type
has 32+ lines), it's better to provide a clean code to avoid people thinking
this is okay and potentially producing not fully working things.

Fixes: 35d13d94893f ("gpio: pca953x: convert to use bitmap API")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/20200930142013.59247-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index cc95f1630feb01a1fac06c5088ba3580d947e915..11c3bbd105f114ee0fafea9e30d0ddbdb9d50611 100644 (file)
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -938,6 +938,7 @@ out:
 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 {
        DECLARE_BITMAP(val, MAX_LINE);
+       unsigned int i;
        int ret;
 
        ret = device_pca95xx_init(chip, invert);
@@ -945,7 +946,9 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
                goto out;
 
        /* To enable register 6, 7 to control pull up and pull down */
-       memset(val, 0x02, NBANK(chip));
+       for (i = 0; i < NBANK(chip); i++)
+               bitmap_set_value8(val, 0x02, i * BANK_SZ);
+
        ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
        if (ret)
                goto out;