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SubjectRe: [PATCH v4 2/2] spi: cadence: add support for Cadence XSPI controller
On 13/09/21 02:06PM, Parshuram Thombare wrote:
> This patch adds driver for Cadence's XSPI controller.
> It supports 3 work modes.
> 1. ACMD (auto command) work mode
> ACMD name is because it uses auto command engine in the controller.
> It further has 2 modes PIO and CDMA (command DMA).
> The CDMA work mode is dedicated for high-performance application
> where very low software overhead is required. In this mode the
> Command Engine is programmed by the series of linked descriptors
> stored in system memory. These descriptors provide commands to execute
> and store status information for finished commands.
> The PIO mode work mode is dedicated for single operation where
> constructing a linked list of descriptors would require too
> much effort.
> 2. STIG (Software Triggered Instruction Generator) work mode
> In STIG mode, controller sends low-level instructions to memory.
> Each instruction is 128-bit width. There is special instruction
> DataSequence which carries information about data phase.
> Driver uses Slave DMA interface to transfer data as only this
> interface can be used in STIG work mode.
> 3. Direct work mode
> This work mode allows sending data without invoking any command through
> the slave interface.
> Currently only STIG work mode is enabled, remaining work modes will
> be added later.

Acked-by: Pratyush Yadav <p.yadav@ti.com>

--
Regards,
Pratyush Yadav
Texas Instruments Inc.

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