diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..9477e44
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
+
+name: CI
+
+on:
+  push:
+    #branches: [main]
+  pull_request:
+    #branches: [main]
+
+jobs:
+  ptest:
+    runs-on: ubuntu-22.04
+    # Full Yocto builds from a cold cache take several hours.
+    timeout-minutes: 480
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Remove large pre-installed packages that are unused in a Yocto build.
+      # This reclaims ~15 GB, bringing total available space to ~25 GB.
+      - name: Free disk space
+        run: |
+          sudo rm -rf /usr/local/lib/android /usr/share/dotnet /opt/ghc
+          sudo rm -rf /opt/hostedtoolcache/CodeQL
+          sudo docker image prune --all --force
+          sudo apt-get remove -y '^aspnetcore-.*' '^dotnet-.*' '^llvm-.*' \
+            'php.*' '^mongodb-.*' '^mysql-.*' azure-cli google-cloud-cli \
+            google-chrome-stable firefox powershell mono-devel libgl1-mesa-dri \
+            --fix-broken 2>/dev/null || true
+          sudo apt-get autoremove -y
+          sudo apt-get clean
+          df -h
+
+      - name: Install Yocto host dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            gawk wget git diffstat unzip texinfo gcc build-essential \
+            chrpath socat cpio python3 python3-pip python3-pexpect \
+            xz-utils debianutils iputils-ping python3-git python3-jinja2 \
+            libegl1-mesa libsdl1.2-dev python3-subunit mesa-common-dev \
+            zstd liblz4-tool file locales libacl1 sshpass
+          sudo locale-gen en_US.UTF-8
+
+      - name: Install kas
+        run: pip3 install kas
+
+      - name: Restore downloads cache
+        uses: actions/cache/restore@v4
+        with:
+          path: /home/runner/yocto-downloads
+          key: yocto-downloads-${{ hashFiles('kas/ci.yml') }}
+          restore-keys: |
+            yocto-downloads-
+
+      - name: Restore sstate cache
+        uses: actions/cache/restore@v4
+        with:
+          path: /home/runner/yocto-sstate
+          key: yocto-sstate-${{ runner.arch }}-${{ hashFiles('kas/ci.yml') }}-${{ github.sha }}
+          restore-keys: |
+            yocto-sstate-${{ runner.arch }}-${{ hashFiles('kas/ci.yml') }}-
+            yocto-sstate-${{ runner.arch }}-
+
+      - name: Build image
+        run: kas build kas/ci.yml
+
+      - name: Run ptests in QEMU
+        timeout-minutes: 30
+        run: |
+          # kas checks out repos next to the project directory; poky ends up
+          # in the kas work dir (defaults to $GITHUB_WORKSPACE).
+          POKY_DIR="${GITHUB_WORKSPACE}/poky"
+          BUILD_DIR="${GITHUB_WORKSPACE}/build"
+
+          source "${POKY_DIR}/oe-init-build-env" "${BUILD_DIR}"
+
+          # Start QEMU with slirp (user-mode) networking; no root or tap device
+          # needed. runqemu maps host:2222 -> guest:22 by default under slirp.
+          runqemu qemux86-64 nographic slirp \
+            QB_KERNEL_CMDLINE_APPEND="console=ttyS0" &
+          QEMU_PID=$!
+
+          # Wait up to 5 minutes for SSH to become available.
+          READY=0
+          for i in $(seq 1 60); do
+            if sshpass -p "" ssh \
+                -p 2222 \
+                -o StrictHostKeyChecking=no \
+                -o ConnectTimeout=5 \
+                -o PasswordAuthentication=yes \
+                -o PreferredAuthentications=password \
+                root@localhost true 2>/dev/null; then
+              READY=1
+              break
+            fi
+            sleep 5
+          done
+
+          if [ "${READY}" -ne 1 ]; then
+            echo "Timed out waiting for QEMU to boot" >&2
+            kill "${QEMU_PID}" || true
+            exit 1
+          fi
+
+          sshpass -p "" ssh \
+            -p 2222 \
+            -o StrictHostKeyChecking=no \
+            -o PasswordAuthentication=yes \
+            -o PreferredAuthentications=password \
+            root@localhost \
+            ptest-runner gpiod-sysfs-proxy \
+            | tee "${GITHUB_WORKSPACE}/ptest-results.txt"
+          RC=${PIPESTATUS[0]}
+
+          kill "${QEMU_PID}" || true
+          exit "${RC}"
+
+      - name: Upload ptest results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ptest-results
+          path: ptest-results.txt
+
+      - name: Save downloads cache
+        if: always()
+        uses: actions/cache/save@v4
+        with:
+          path: /home/runner/yocto-downloads
+          key: yocto-downloads-${{ hashFiles('kas/ci.yml') }}
+
+      - name: Save sstate cache
+        if: always()
+        uses: actions/cache/save@v4
+        with:
+          path: /home/runner/yocto-sstate
+          key: yocto-sstate-${{ runner.arch }}-${{ hashFiles('kas/ci.yml') }}-${{ github.sha }}
diff --git a/README.md b/README.md
index 49352f2..1afb4d8 100644
--- a/README.md
+++ b/README.md
@@ -79,3 +79,22 @@ allow to associate a hard-coded base with a GPIO chip by its label.
 
 * [sysfs-gpio-shim](https://github.com/info-beamer/sysfs-gpio-shim), written in
 C. Officially only supports Raspberry Pi.
+
+
+## Testing
+
+To test this project, you need to build a test image first using OpenEmbedded.
+
+Install `kas` using the [upstream instructions](https://kas.readthedocs.io/en/latest/userguide/getting-started.html).
+
+Install other tools required, for instance on debian:
+```
+sudo apt install
+
+TODO
+```
+
+Then build the image:
+```
+kas-container build tests/yocto/gpiod-sysfs-proxy-tests.yml
+```
diff --git a/test.md b/test.md
new file mode 100644
index 0000000..08bf277
--- /dev/null
+++ b/test.md
@@ -0,0 +1,66 @@
+# TODO: move into README.md under testing heading
+
+
+Then run:
+
+
+# TODO: remove mkdir and cd ???
+```bash
+kas-container build tests/yocto/gpiod-sysfs-proxy-tests.yml
+```
+
+That should produce:
+
+# TODO: Wrong path
+```bash
+build/tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.ext4
+```
+
+Start a kas shell:
+
+```bash
+kas-container --runtime-args "-v $PWD:/mnt:ro" shell tests/yocto/gpiod-sysfs-proxy-tests.yml
+```
+
+Boot the image in QEMU:
+
+```bash
+runqemu qemux86-64 core-image-minimal nographic slirp snapshot \
+  qemuparams="-virtfs local,path=/mnt,mount_tag=hostshare,security_model=none,id=hostshare"
+```
+
+Once the VM boots, log in as `root` with an empty password, then run:
+
+```bash
+mount -t 9p -o trans=virtio,version=9p2000.L hostshare /mnt
+
+
+#root@qemux86-64:/usr/lib/gpiod-sysfs-proxy/ptest/tests# cp /mnt/gpiod-sysfs-proxy /usr/bin/gpiod-sysfs-proxy
+#systemctl restart gpiod-sysfs-proxy
+#root@qemux86-64:/usr/lib/gpiod-sysfs-proxy/ptest/tests# ./gpio-sysfs-compat-tests -v
+
+
+# root@qemux86-64:/usr/lib/gpiod-sysfs-proxy/ptest/tests# ./gpio-sysfs-compat-tests -v
+# ptest-runner gpiod-sysfs-proxy
+
+
+
+# TODO: didn't try this
+# modprobe configfs
+# modprobe gpio-sim
+# modprobe gpio-mockup
+```
+
+# TODO: didn't try this
+#For an interactive shell over SSH instead of the QEMU console, keep `slirp` and add host forwarding:
+
+#```bash
+#runqemu qemux86-64 core-image-minimal nographic slirp \
+#  qemuparams="-m 2048 -smp 4 -netdev user,id=net0,hostfwd=tcp::2222-:22"
+#```
+#Then from another terminal:
+#
+#```bash
+#ssh -p 2222 root@localhost
+#ptest-runner gpiod-sysfs-proxy
+#```
diff --git a/tests/yocto/conf/layer.conf b/tests/yocto/conf/layer.conf
new file mode 100644
index 0000000..2fef919
--- /dev/null
+++ b/tests/yocto/conf/layer.conf
@@ -0,0 +1,11 @@
+BBPATH .= ":${LAYERDIR}"
+
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
+            ${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "gpiod-sysfs-proxy-tests"
+BBFILE_PATTERN_gpiod-sysfs-proxy-tests = "^${LAYERDIR}/"
+BBFILE_PRIORITY_gpiod-sysfs-proxy-tests = "6"
+
+# TODO: Fixup
+LAYERSERIES_COMPAT_gpiod-sysfs-proxy-tests = "wrynose master"
diff --git a/tests/yocto/gpiod-sysfs-proxy-tests.yml b/tests/yocto/gpiod-sysfs-proxy-tests.yml
new file mode 100644
index 0000000..e1a2104
--- /dev/null
+++ b/tests/yocto/gpiod-sysfs-proxy-tests.yml
@@ -0,0 +1,104 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
+
+header:
+  version: 14
+
+machine: qemux86-64
+distro: poky
+
+target: core-image-minimal
+
+repos:
+  bitbake:
+    url: https://git.openembedded.org/bitbake
+    branch: master
+    path: bitbake
+    layers:
+      .: disabled
+
+  openembedded-core:
+    url: https://git.openembedded.org/openembedded-core
+    branch: master
+    path: openembedded-core
+    layers:
+      meta:
+
+  meta-yocto:
+    url: https://git.yoctoproject.org/meta-yocto
+    branch: master
+    path: meta-yocto
+    layers:
+      meta-poky:
+
+  meta-openembedded:
+    url: https://git.openembedded.org/meta-openembedded
+    branch: master
+    path: meta-openembedded
+    layers:
+      meta-oe:
+      meta-python:
+      meta-networking:
+      meta-filesystems:
+
+  # TODO: See if we can add the source here rather than mounting via 9pfs ?
+  gpiod-sysfs-proxy:
+    path: .
+    layers:
+      tests/yocto:
+
+local_conf_header:
+  features: |
+    EXTRA_IMAGE_FEATURES = "allow-empty-password empty-root-password allow-root-login"
+    EXTRA_IMAGE_FEATURES += "ptest-pkgs"
+
+    DISTRO_FEATURES = "ipv4 xattr zeroconf ldconfig"
+    DISTRO_FEATURES:append = " ptest"
+
+    INIT_MANAGER = "systemd"
+
+  kernel: |
+    KERNEL_FEATURES:append = " \
+        features/gpio/sim.scc \
+        features/gpio/mockup.scc \
+        features/gpio/sysfs.scc \
+        features/overlayfs/overlayfs.scc \
+    "
+
+  packages: |
+    IMAGE_INSTALL:append = " \
+        kernel-module-gpio-sim \
+        kernel-module-gpio-mockup \
+        kernel-module-configfs \
+    "
+
+    IMAGE_INSTALL:append = " libgpiod libgpiodcxx libgpiod-tools"
+    #IMAGE_INSTALL:append = " libgpiod-cli"
+
+    #PACKAGECONFIG:append:pn-libgpiod = " glib"
+    #PACKAGECONFIG:append:pn-libgpiod = " dbus"
+
+    #IMAGE_INSTALL:append = " python3-gpiod"
+
+    # TODO: make it install the source from this repo
+    IMAGE_INSTALL:append = " gpiod-sysfs-proxy"
+    PACKAGECONFIG:append:pn-gpiod-sysfs-proxy = " sys-class-mount"
+
+    IMAGE_INSTALL:append = " ptest-runner"
+
+    IMAGE_FEATURES += "ssh-server-openssh"
+
+  qemu-virtfs: |
+    PACKAGECONFIG:append:pn-qemu-system-native = " virtfs"
+
+  build: |
+    # TODO: remove this; it was for github actions
+    # Fixed paths so the GitHub Actions cache keys are stable across runs.
+    #DL_DIR = "/home/runner/yocto-downloads"
+    #SSTATE_DIR = "/home/runner/yocto-sstate"
+    DL_DIR = "${TOPDIR}/../downloads"
+    SSTATE_DIR = "${TOPDIR}/../sstate-cache"
+
+    # TODO: remove this; it was for github actions
+    #BB_NUMBER_THREADS = "4"
+    #PARALLEL_MAKE = "-j4"
diff --git a/tests/yocto/recipes-kernel/linux/files/kernel-9pfs.cfg b/tests/yocto/recipes-kernel/linux/files/kernel-9pfs.cfg
new file mode 100644
index 0000000..23dd2ba
--- /dev/null
+++ b/tests/yocto/recipes-kernel/linux/files/kernel-9pfs.cfg
@@ -0,0 +1,5 @@
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y
+CONFIG_9P_FS=y
+CONFIG_9P_FS_POSIX_ACL=y
+CONFIG_VIRTIO_PCI=y
diff --git a/tests/yocto/recipes-kernel/linux/linux-yocto_%.bbappend b/tests/yocto/recipes-kernel/linux/linux-yocto_%.bbappend
new file mode 100644
index 0000000..8150966
--- /dev/null
+++ b/tests/yocto/recipes-kernel/linux/linux-yocto_%.bbappend
@@ -0,0 +1,3 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
+
+SRC_URI:append:qemux86-64 = " file://kernel-9pfs.cfg"