soc: qcom: apr: Make qcom,protection-domain optional again

APR should not fail if the service device tree node does not have
the qcom,protection-domain property, since this functionality does
not exist on older platforms such as MSM8916 and MSM8996.

Ignore -EINVAL (returned when the property does not exist) to fix
a regression on 6.2-rc1 that prevents audio from working:

  qcom,apr remoteproc0:smd-edge.apr_audio_svc.-1.-1:
    Failed to read second value of qcom,protection-domain
  qcom,apr remoteproc0:smd-edge.apr_audio_svc.-1.-1:
    Failed to add apr 3 svc

Fixes: 6d7860f5750d ("soc: qcom: apr: Add check for idr_alloc and of_property_read_string_index")
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221229151648.19839-3-stephan@gerhold.net

diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
index cd44f17dad3d04cd3ec1f6b8d8614e3fb9828456..d51abb462ae5d3481d26a0bdc6ababe603d7ca26 100644 (file)
--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -461,9 +461,10 @@ static int apr_add_device(struct device *dev, struct device_node *np,
                goto out;
        }
 
+       /* Protection domain is optional, it does not exist on older platforms */
        ret = of_property_read_string_index(np, "qcom,protection-domain",
                                            1, &adev->service_path);
-       if (ret < 0) {
+       if (ret < 0 && ret != -EINVAL) {
                dev_err(dev, "Failed to read second value of qcom,protection-domain\n");
                goto out;
        }