• Christophe Ricard's avatar
    NFC: st21nfcb: Add driver for STMicroelectronics ST21NFCB NFC chip · 35630df6
    Christophe Ricard authored
    Add driver for STMicroelectronics ST21NFCB NFC controller.
    ST21NFCB is using NCI protocol and a proprietary low level transport
    protocol called NDLC used on top.
    
    NDLC:
    The protocol defines 2 types of frame:
    - One type carrying NCI data (referred as DATAFRAME frames).
    - One type carrying protocol information used for flow control and error
    control mechanisms (referred as SUPERVISOR frames).
    
    After each frame transmission to the NFC controller, the device host
    SHALL waitfor  an ACK (SUPERVISOR frame) reception before sending a
    new frame.
    The NFC controller MAY send a frame at anytime to the device host.
    The NFC controller MAY send a specific WAIT supervisor frame to indicate
    to device host that a NCI data packet has been received but that it could
    take significant time before the NFC controller sends an ACK and thus
    allows next data reception.
    Signed-off-by: default avatarChristophe Ricard <christophe-h.ricard@st.com>
    Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
    35630df6
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