Messages in this thread | | | From | Tony Huang 黃懷厚 <> | Subject | RE: [PATCH v4 2/2] misc: Add iop driver for Sunplus SP7021 | Date | Fri, 17 Dec 2021 11:03:36 +0000 |
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Dear Arnd: > > > 3.So you ask me to control IOP(8051) through file_operations, not > > through DEVICE_ATTR > > No, neither of them. Use the appropriate drivers/*/ subsystems for any > functionality that has an existing subsystem. If there is something that the iop > does that does not yet have a subsystem, that requires a more thorough design > discussion for creating a new user interface, ideally in a hardware-independent > way. You should not start with that until all the normal features (rtc, wakeup, > suspend, gpio, ...) are supported. >
IOP(8051) has 12 bytes Mailbox registers, which can be read and written by IOP(8051) and System, used to exchange information with the system, faster than shared memory.
Thanks
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