Add WM8960 soundcard support

Signed-off-by: Devendra Tewari <devendra.tewari@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/docs/extra-build-config.md b/docs/extra-build-config.md
index 1caf904..ec3bd6a 100644
--- a/docs/extra-build-config.md
+++ b/docs/extra-build-config.md
@@ -349,3 +349,24 @@ Also, this will enable adding Contiguous Memory Allocation value in the cmdline.
 Ref.:
 * <https://github.com/raspberrypi/documentation/blob/master/linux/software/libcamera/README.md>
 * <https://www.raspberrypi.org/blog/an-open-source-camera-stack-for-raspberry-pi-using-libcamera/>
+
+## WM8960 soundcard support
+
+Support for WM8960 based sound cards such as the WM8960 Hi-Fi Sound Card HAT for Raspberry Pi from Waveshare, and ReSpeaker 2 / 4 / 6 Mics Pi HAT from Seeed Studio, can be enabled in `local.conf`
+
+    ```conf
+    MACHINE_FEATURES += "wm8960"
+    ```
+
+You may need to adjust volume and toggle switches that are off by default
+
+    ```bash
+    amixer -c1 sset 'Headphone',0 80%,80%
+    amixer -c1 sset 'Speaker',0 80%,80%
+    amixer -c1 sset 'Left Input Mixer Boost' toggle
+    amixer -c1 sset 'Left Output Mixer PCM' toggle
+    amixer -c1 sset 'Right Input Mixer Boost' toggle
+    amixer -c1 sset 'Right Output Mixer PCM' toggle
+    ```
+
+Audio capture on ReSpeaker 2 / 4 / 6 Mics Pi HAT from Seeed Studio is very noisy.