On Wednesday, November 04, 2015 at 03:36:08 AM, Thomas Chou wrote:
Hi Marek,
Hi!
On 2015年11月04日 01:44, Marek Vasut wrote:
On Tuesday, November 03, 2015 at 02:22:12 PM, Thomas Chou wrote:
Add Altera Generic Quad SPI Controller support. The controller converts SPI NOR flash to parallel flash interface. So it is not like other SPI flash, but rather like CFI flash.
Signed-off-by: Thomas Chou thomas@wytron.com.tw
You might want to look at https://lwn.net/Articles/636882/ , it is the driver for the same hardware, but for Linux. But keep in mind that the driver had some difficulties getting in, you might want to check the discussions in linux-mtd .
I did check and follow the threads for a while since you pointed me about it in earlier communication. It is v5 last month. But the author decided to wait for hardware fix on rdid.
I think I had a stake there as well ;-)
Yet I have a different point as I stated in the patch message. It is NOT a spi-nor since the hardware converted it to parallel interface. It should be treated more like cfi flash. I think it might be a mistake to take it as spi-nor. And this might be the hidden cause to prevent the linux driver getting in. So I wrote it my way.
Let me just put an idea here, it might be wrong -- but doesn't this seem like some sort of NVMEM device? See for example:
https://lkml.org/lkml/2015/5/21/643
Best regards, Marek Vasut