iio: adc: at91-sama5d2_adc: fix probe error on missing trigger property
This fix allows platforms to probe correctly even if the trigger edge property is missing. The hardware trigger will no longer be registered in the sybsystem Preserves backwards compatibility with the support that was in the driver before the hardware trigger. https://storage.kernelci.org/mainline/master/v4.14-rc2-255-g74d83ec2b734/arm/sama5_defconfig/lab-free-electrons/boot-at91-sama5d2_xplained.txtSigned-off-by: Eugen Hristev <eugen.hristev@microchip.com> Fixes: 5e1a1da0 ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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