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-HSI - High-speed Synchronous Serial Interface
-
-1. Introduction
-~~~~~~~~~~~~~~~
-
-High Speed Syncronous Interface (HSI) is a fullduplex, low latency protocol,
-that is optimized for die-level interconnect between an Application Processor
-and a Baseband chipset. It has been specified by the MIPI alliance in 2003 and
-implemented by multiple vendors since then.
-
-The HSI interface supports full duplex communication over multiple channels
-(typically 8) and is capable of reaching speeds up to 200 Mbit/s.
-
-The serial protocol uses two signals, DATA and FLAG as combined data and clock
-signals and an additional READY signal for flow control. An additional WAKE
-signal can be used to wakeup the chips from standby modes. The signals are
-commonly prefixed by AC for signals going from the application die to the
-cellular die and CA for signals going the other way around.
-
-+------------+ +---------------+
-| Cellular | | Application |
-| Die | | Die |
-| | - - - - - - CAWAKE - - - - - - >| |
-| T|------------ CADATA ------------>|R |
-| X|------------ CAFLAG ------------>|X |
-| |<----------- ACREADY ------------| |
-| | | |
-| | | |
-| |< - - - - - ACWAKE - - - - - - -| |
-| R|<----------- ACDATA -------------|T |
-| X|<----------- ACFLAG -------------|X |
-| |------------ CAREADY ----------->| |
-| | | |
-| | | |
-+------------+ +---------------+
-
-2. HSI Subsystem in Linux
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-In the Linux kernel the hsi subsystem is supposed to be used for HSI devices.
-The hsi subsystem contains drivers for hsi controllers including support for
-multi-port controllers and provides a generic API for using the HSI ports.
-
-It also contains HSI client drivers, which make use of the generic API to
-implement a protocol used on the HSI interface. These client drivers can
-use an arbitrary number of channels.
-
-3. hsi-char Device
-~~~~~~~~~~~~~~~~~~
-
-Each port automatically registers a generic client driver called hsi_char,
-which provides a charecter device for userspace representing the HSI port.
-It can be used to communicate via HSI from userspace. Userspace may
-configure the hsi_char device using the following ioctl commands:
-
-* HSC_RESET:
- - flush the HSI port
-
-* HSC_SET_PM
- - enable or disable the client.
-
-* HSC_SEND_BREAK
- - send break
-
-* HSC_SET_RX
- - set RX configuration
-
-* HSC_GET_RX
- - get RX configuration
-
-* HSC_SET_TX
- - set TX configuration
-
-* HSC_GET_TX
- - get TX configuration