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2018-06-06mailbox: add STMicroelectronics STM32 IPCC driverFabien Dessenne1-0/+402
The STMicroelectronics STM32 Inter-Processor Communication Controller (IPCC) is used for communicating data between two processors. It provides a non blocking signaling mechanism to post and retrieve communication data in an atomic way. Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com> Signed-off-by: Ludovic Barre <ludovic.barre@st.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>