remoteproc: stm32: add an ST stm32_rproc driver
This patch introduces a new remoteproc driver to control Cortex-M4 co-processor of the STM32 family. It provides with the following features: - start and stop - dedicated co-processor memory regions registration - coredump and recovery Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com> Signed-off-by: Ludovic Barre <ludovic.barre@st.com> Signed-off-by: Loic Pallardy <loic.pallardy@st.com> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> [bjorn: Fixup of dev_dbg types and cast of int to pointer in mbox send] Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
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