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gpio: update instructions for setting up libgpiod

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Signed-off-by: Erik Schilling <erik.schilling@linaro.org>
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Erik Schilling 2023-06-29 13:50:50 +02:00 committed by Viresh Kumar
parent 6d548cd7c8
commit f0b0eee465
1 changed files with 14 additions and 8 deletions
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README.md
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@ -45,14 +45,20 @@ logic to service the virtio requests directly in the application.
## Build dependency
The GPIO crate needs a local installation of libgpiod library to be available,
which can be done like:
The GPIO crate needs a local installation of libgpiod library to be available.
If your distro ships libgpiod >= v2.0, then you should be fine.
$ git clone --depth 1 --branch v2.0-rc1 https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/
$ cd libgpiod
$ ./autogen.sh && make
Otherwise, you will need to build libgpiod yourself:
Either you can do a 'make install' now on your system, or provide path to the
locally build library like this while building vhost-device crates:
git clone --depth 1 --branch v2.0.x https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/
cd libgpiod
./autogen.sh --prefix="$PWD/install/"
make install
$ RUSTFLAGS='-L /home/<username>/libgpiod/lib/.libs/' cargo build --release
In order to inform tools about the build location, you can now set:
export PKG_CONFIG_PATH="<PATH-TO-LIBGPIOD>/install/lib/pkgconfig/"
To prevent setting this in every terminal session, you can also configure
cargo to
[set it automatically](https://doc.rust-lang.org/cargo/reference/config.html#env).