coresight-etm4x: Adding CoreSight ETM4x driver
This driver manages the CoreSight ETMv4 (Embedded Trace Macrocell) IP block to support HW assisted tracing on ARMv7 and ARMv8 architectures. Signed-off-by: NPratik Patel <pratikp@codeaurora.org> Signed-off-by: NKaixu Xia <xiakaixu@huawei.com> Signed-off-by: NMathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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