[PATCH v3 4/4] rpmsg: Introduce Qualcomm RPM glink driver

This introduces a basic driver for communicating over "native glink" with the RPM found in Qualcomm platforms. Signed-off-by: Bjorn Andersson --- Changes since v2: - Replace syscon with apcs_ipc doorbell implementation Changes since v1: - Depend on HAS_IOMEM, for UM

[PATCH v3 4/4] rpmsg: Introduce Qualcomm RPM glink driver

This introduces a basic driver for communicating over "native glink" with the RPM found in Qualcomm platforms. Signed-off-by: Bjorn Andersson --- Changes since v2: - Replace syscon with apcs_ipc doorbell implementation Changes since v1: - Depend on HAS_IOMEM, for UM build failure - Wrap