iio: light: fix kconfig dependency bug for VCNL4035

commit 44a146a44f656fc03d368c1b9248d29a128cd053 upstream.

When VCNL4035 is enabled and IIO_BUFFER is disabled, it results in the
following Kbuild warning:

WARNING: unmet direct dependencies detected for IIO_TRIGGERED_BUFFER
  Depends on [n]: IIO [=y] && IIO_BUFFER [=n]
  Selected by [y]:
  - VCNL4035 [=y] && IIO [=y] && I2C [=y]

The reason is that VCNL4035 selects IIO_TRIGGERED_BUFFER without depending
on or selecting IIO_BUFFER while IIO_TRIGGERED_BUFFER depends on
IIO_BUFFER. This can also fail building the kernel.

Honor the kconfig dependency to remove unmet direct dependency warnings
and avoid any potential build failures.

Fixes: 55707294c4eb ("iio: light: Add support for vishay vcnl4035")
Signed-off-by: Necip Fazil Yildiran <fazilyildiran@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=209883
Link: https://lore.kernel.org/r/20201102223523.572461-1-fazilyildiran@gmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 182bd18c4bb2453510a056f12e710e30bb534d1c..7447791d9b241b9a8bdd8871dd223527431c2dd0 100644 (file)
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -529,6 +529,7 @@ config VCNL4000
 
 config VCNL4035
        tristate "VCNL4035 combined ALS and proximity sensor"
+       select IIO_BUFFER
        select IIO_TRIGGERED_BUFFER
        select REGMAP_I2C
        depends on I2C