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Message-Id: <20201102223523.572461-1-fazilyildiran@gmail.com>
Date:   Tue,  3 Nov 2020 01:35:24 +0300
From:   Necip Fazil Yildiran <fazilyildiran@...il.com>
To:     jic23@...nel.org
Cc:     pn@...x.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, paul@...zz.com, jeho@...utexas.edu,
        Necip Fazil Yildiran <fazilyildiran@...il.com>
Subject: [PATCH] iio: light: fix kconfig dependency bug for VCNL4035

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")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=209883
Signed-off-by: Necip Fazil Yildiran <fazilyildiran@...il.com>
---
 drivers/iio/light/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index cade6dc0305b..33ad4dd0b5c7 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -544,6 +544,7 @@ config VCNL4000
 
 config VCNL4035
 	tristate "VCNL4035 combined ALS and proximity sensor"
+	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	select REGMAP_I2C
 	depends on I2C
-- 
2.25.1

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