Add device tree overlay support

guowenxue

2023-07-26 e5531e2c0fd376409fd04c28a294edf04d903042

 recipes-kernel/linux/linux-imx_5.15.bbappend

@@ -4,9 +4,27 @@
SRC_URI += " file://linux-imx-lf-5.15.71-2.2.0.patch "
PATCHTOOL = "patch"

KERNEL_DANGLING_FEATURES_WARN_ONLY="1"
KERNEL_DTC_FLAGS = "-@"
KERNEL_DTOVERLAY ?= ""

do_copy_defconfig:append() {
    cp ${S}/arch/arm/configs/${MACHINE}_defconfig ${WORKDIR}/defconfig
    cp ${S}/arch/arm/configs/${MACHINE}_defconfig ${B}/.config
}

KERNEL_DANGLING_FEATURES_WARN_ONLY="1"
do_compile:append() {
    if [ -n "${KERNEL_DTC_FLAGS}" ]; then
        export DTC_FLAGS="${KERNEL_DTC_FLAGS}"
    fi

    for dtbf in ${KERNEL_DTOVERLAY}; do
        dtb=`normalize_dtb "$dtbf"`
        oe_runmake $dtb CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}
    done
}

do_deploy:append(){
    install -d ${DEPLOYDIR}/overlays
    cp ${B}/arch/arm/boot/dts/${MACHINE}/*.dtbo ${DEPLOYDIR}/overlays
}