gpio: 104-idio-16: Define maximum valid register address offset

commit c4d35e635f3a65aec291a6045cae8c99cede5bba upstream.

Attempting to load the 104-idio-16 module fails during regmap
initialization with a return error -EINVAL. This is a result of the
regmap cache failing initialization. Set the idio_16_regmap_config
max_register member to fix this failure.

Fixes: 2c210c9a34a3 ("gpio: 104-idio-16: Migrate to the regmap API")
Reported-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Closes: https://lore.kernel.org/r/9b0375fd-235f-4ee1-a7fa-daca296ef6bf@nutanix.com
Suggested-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Cc: stable@vger.kernel.org
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20251020-fix-gpio-idio-16-regmap-v2-1-ebeb50e93c33@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index f03ccd0f534cffbb8ac3eceb9328df73ba57587a..f60872d1e8a580b392cf16c65ffefdf29ef04d46 100644 (file)
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -59,6 +59,7 @@ static const struct regmap_config idio_16_regmap_config = {
        .reg_stride = 1,
        .val_bits = 8,
        .io_port = true,
+       .max_register = 0x5,
        .wr_table = &idio_16_wr_table,
        .rd_table = &idio_16_rd_table,
        .volatile_table = &idio_16_rd_table,