Re: [PATCH 9/9] spi: atmel-quadspi: add support for sam9x60 qspi controller

[Boris Brezillon <bbrezillon@xxxxxxxxxx>]

On Wed, 30 Jan 2019 15:08:47 +0000
<Tudor.Ambarus@xxxxxxxxxxxxx> wrote:

> +/*
> + * atmel_qspi_set_address_mode() - set address mode.
> + * @cfg:	contains register values
> + * @op:		describes a SPI memory operation
> + *
> + * The controller allows 24 and 32-bit addressing while NAND-flash requires
> + * 16-bit long. Handling 8-bit long addresses is done using the option field.
> + * For the 16-bit addresses, the workaround depends of the number of requested
> + * dummy bits. If there are 8 or more dummy cycles, the address is shifted and
> + * sent with the first dummy byte. Otherwise opcode is disabled and the first
> + * byte of the address contains the command opcode (works only if the opcode and
> + * address use the same buswidth). The limitation is when the 16-bit address is
> + * used without enough dummy cycles and the opcode is using a different buswidth
> + * than the address.

Too bad they didn't patch the IP to support 1 to 4 address bytes
instead of only 3 or 4 :-(.