spi cs fix and remove rw009 and esp_slip

[IRISZZW]

• rw009 and esp_slip do not exist any more

device: spi_master: optimize the fix of spi cs auto toggle issue and add polling function for sub system spi master driver.

• For currently supported arc boards, there is one issue that the cs pin of dw spi master & sub system spi master will toggle automacticall when spi tx fifo is empty.

• the spi tx fifo can be empty by two reasons

  • the spi transfer is finished which is a correct case

  • the spi transfer is not finished, but spi fifo operation is interruptted by higher priority interrupts. This is a wrong case as the toggle of cs will confuse spi slave before spi transfer is finished.

  • to avoid reason 2

  • use other bit/pin to mast spi cs, e.g. emsk 2.2, hsdk

  • disable interrupts for poll based operations, e.g. emsdp

  • avoid interrupt preemption to spi mst interrupt for int based operations, e.g. iotdk.

[fanghuaqi]

Sphinx link check result

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