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i2c: mux: fix up dependencies

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commit 93d710a65ef02fb7fd48ae207e78f460bd7a6089 upstream.

We get the following build error from UM Linux after adding
an entry to drivers/iio/gyro/Kconfig that issues "select I2C_MUX":

ERROR: "devm_ioremap_resource"
   [drivers/i2c/muxes/i2c-mux-reg.ko] undefined!
ERROR: "of_address_to_resource"
   [drivers/i2c/muxes/i2c-mux-reg.ko] undefined!

It appears that the I2C mux core code depends on HAS_IOMEM
for historical reasons, while CONFIG_I2C_MUX_REG does *not*
have a direct dependency on HAS_IOMEM.

This creates a situation where a allyesconfig or allmodconfig
for UM Linux will select I2C_MUX, and will implicitly enable
I2C_MUX_REG as well, and the compilation will fail for the
register driver.

Fix this up by making I2C_MUX_REG depend on HAS_IOMEM and
removing the dependency from I2C_MUX.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Reported-by: Jonathan Cameron <jic23@jic23.retrosnub.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij 2016-11-14 15:34:17 +01:00 • committed by Greg Kroah-Hartman
parent 4e583b89ad
commit 936d157fa7
2 changed files with 1 additions and 1 deletions
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1
drivers/i2c/Kconfig
View file

@ -59,7 +59,6 @@ config I2C_CHARDEV
config I2C_MUX
tristate "I2C bus multiplexing support"
depends on HAS_IOMEM
help
Say Y here if you want the I2C core to support the ability to
handle multiplexed I2C bus topologies, by presenting each

1
drivers/i2c/muxes/Kconfig
View file

@ -63,6 +63,7 @@ config I2C_MUX_PINCTRL
config I2C_MUX_REG
tristate "Register-based I2C multiplexer"
depends on HAS_IOMEM
help
If you say yes to this option, support will be included for a
register based I2C multiplexer. This driver provides access to