On Thu, 2013-09-12 at 17:28 +0800, Huang Shijie wrote: > 于 2013年09月11日 22:05, David Woodhouse 写道: > > What*actually* happens, on the wire(s), when the flash driver asks the > > SPI controller to perform a transaction? > The LUT registers tell the controller how many wires are needed for a > transaction. > For example, the read status only use a single line, while the quad read > uses 4 lines. Is this not something that could theoretically be provided by the caller when it *makes* the transaction? Conceptually speaking, could it not be an additional argument to spi_write_then_read() ? After all, it's the *device* driver (m25p80.c etc.) which will know what the transaction actually *is*, and how many lines the device will want to use for each transaction? -- dwmw2
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