The protection domain functionality exists only in SoCs starting from
MSM8998 [1], while the APR bindings are also used on older platforms.
Commit 41288c3058 ("ASoC: dt-bindings: qcom,apr: Split services to
shared schema") made the "qcom,protection-domain" required but it
should remain optional to avoid dtbs_check warnings on older platforms,
e.g.:
arch/arm64/boot/dts/qcom/apq8096-db820c.dtb:
apr: service@3: 'qcom,protection-domain' is a required property
From schema: Documentation/devicetree/bindings/soc/qcom/qcom,apr.yaml
[1]: https://lore.kernel.org/all/20200312120842.21991-1-sibis@codeaurora.org/
Fixes: 41288c3058 ("ASoC: dt-bindings: qcom,apr: Split services to shared schema")
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221229151648.19839-2-stephan@gerhold.net
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