[PATCH v3 0/8] Add the Quadspi driver for vf610-twr
From: dwmw2@infradead.org (David Woodhouse)
Date: 2013-09-12 09:50:31
Also in:
linux-devicetree
On Thu, 2013-09-12 at 17:28 +0800, Huang Shijie wrote:
? 2013?09?11? 22:05, David Woodhouse ??:quoted
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 -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 5745 bytes Desc: not available URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20130912/426d49e6/attachment.bin>