From: YueHaibing <yuehaib...@huawei.com>

When building with CONFIG_GPIOLIB is not set
gcc warns this:

drivers/iio/adc/ti-ads7950.c:75:19: error: field chip has incomplete type
  struct gpio_chip chip;
                   ^~~~
drivers/iio/adc/ti-ads7950.c: In function ti_ads7950_set:
drivers/iio/adc/ti-ads7950.c:409:32: error: implicit declaration of function 
gpiochip_get_data; did you mean acpi_get_data? 
[-Werror=implicit-function-declaration]
  struct ti_ads7950_state *st = gpiochip_get_data(chip);
                                ^~~~~~~~~~~~~~~~~
                                acpi_get_data

Reported-by: Hulk Robot <hul...@huawei.com>
Fixes: c97dce792dc8 ("iio: adc: ti-ads7950: add GPIO support")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/iio/adc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 846c7ac..f760269 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -968,7 +968,7 @@ config TI_ADS1015
 
 config TI_ADS7950
        tristate "Texas Instruments ADS7950 ADC driver"
-       depends on SPI
+       depends on SPI && GPIOLIB
        select IIO_BUFFER
        select IIO_TRIGGERED_BUFFER
        help
-- 
2.7.4


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