caf72df48b
In xSPI mode, flashes expect 2-byte opcodes. The second byte is called the "command extension". There can be 3 types of extensions in xSPI: repeat, invert, and hex. When the extension type is "repeat", the same opcode is sent twice. When it is "invert", the second byte is the inverse of the opcode. When it is "hex" an additional opcode byte based is sent with the command whose value can be anything. So, make opcode a 16-bit value and add a 'nbytes', similar to how multiple address widths are handled. Some places use sizeof(op->cmd.opcode). Replace them with op->cmd.nbytes The spi-mxic and spi-zynq-qspi drivers directly use op->cmd.opcode as a buffer. Now that opcode is a 2-byte field, this can result in different behaviour depending on if the machine is little endian or big endian. Extract the opcode in a local 1-byte variable and use that as the buffer instead. Both these drivers would reject multi-byte opcodes in their supports_op() hook anyway, so we only need to worry about single-byte opcodes for now. The above two changes are put in this commit to keep the series bisectable. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20200623183030.26591-3-p.yadav@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.