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Add WM8960 soundcard support

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Signed-off-by: Devendra Tewari <devendra.tewari@gmail.com>
This commit is contained in:
Devendra Tewari 2021-06-08 17:39:52 -03:00 committed by Andrei Gherzan
parent 7057d5dcbf
commit 246555aea7
5 changed files with 33 additions and 0 deletions
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1
conf/machine/include/rpi-base.inc
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@ -50,6 +50,7 @@ RPI_KERNEL_DEVICETREE_OVERLAYS ?= " \
overlays/vc4-kms-dsi-7inch.dtbo \ overlays/vc4-kms-dsi-7inch.dtbo \
overlays/w1-gpio.dtbo \ overlays/w1-gpio.dtbo \
overlays/w1-gpio-pullup.dtbo \ overlays/w1-gpio-pullup.dtbo \
overlays/wm8960-soundcard.dtbo \
" "
RPI_KERNEL_DEVICETREE ?= " \ RPI_KERNEL_DEVICETREE ?= " \

21
docs/extra-build-config.md
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@ -349,3 +349,24 @@ Also, this will enable adding Contiguous Memory Allocation value in the cmdline.
Ref.: Ref.:
* <https://github.com/raspberrypi/documentation/blob/master/linux/software/libcamera/README.md> * <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/> * <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.

8
recipes-bsp/bootfiles/rpi-config_git.bb
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@ -30,6 +30,8 @@ GPIO_IR_TX ?= "17"
CAN_OSCILLATOR ?= "16000000" CAN_OSCILLATOR ?= "16000000"
WM8960="${@bb.utils.contains("MACHINE_FEATURES", "wm8960", "1", "0", d)}"
inherit deploy nopackages inherit deploy nopackages
do_deploy() { do_deploy() {
@ -251,6 +253,12 @@ do_deploy() {
;; ;;
esac esac
fi fi
# WM8960 support
if [ "${WM8960}" = "1" ]; then
echo "# Enable WM8960" >> $CONFIG
echo "dtoverlay=wm8960-soundcard" >> $CONFIG
fi
} }
do_deploy_append_raspberrypi3-64() { do_deploy_append_raspberrypi3-64() {

2
recipes-kernel/linux/files/wm8960.cfg Normal file
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@ -0,0 +1,2 @@
CONFIG_I2C_BCM2835=y
CONFIG_SND_SOC_WM8960=y

1
recipes-kernel/linux/linux-raspberrypi.inc
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@ -14,6 +14,7 @@ require recipes-kernel/linux/linux-yocto.inc
SRC_URI += " \ SRC_URI += " \
${@bb.utils.contains("INITRAMFS_IMAGE_BUNDLE", "1", "file://initramfs-image-bundle.cfg", "", d)} \ ${@bb.utils.contains("INITRAMFS_IMAGE_BUNDLE", "1", "file://initramfs-image-bundle.cfg", "", d)} \
${@bb.utils.contains("MACHINE_FEATURES", "vc4graphics", "file://vc4graphics.cfg", "", d)} \ ${@bb.utils.contains("MACHINE_FEATURES", "vc4graphics", "file://vc4graphics.cfg", "", d)} \
${@bb.utils.contains("MACHINE_FEATURES", "wm8960", "file://wm8960.cfg", "", d)} \
" "
KCONFIG_MODE = "--alldefconfig" KCONFIG_MODE = "--alldefconfig"