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commit76974ef9d1upstream. We need to select the buffer code, otherwise we get build errors with undefined functions on the trigger and buffer, if we select just IIO and then AT91_SAMA5D2_ADC from menuconfig This adds a Kconfig 'select' statement like other ADC drivers have it already. Fixes:5e1a1da0f8("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support") Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>