[U-Boot] [PATCH] command "sspi": add write-only flag '.w' (discard read data)

[Mike Frysinger]

On Sat, Jul 16, 2011 at 13:32, Andreas Pretzsch wrote:
> The sspi command writes the given data out on SPI and prints the data it
> reads to the console. For write-only slaves (i.e. a SPI-connected latch
> used as output expander), this is pointless and clutters the console.
> When called as "sspi.w", this output is omitted.
>
> The flag is optional and backwards compatible, previous sspi revisions
> would simply ignore the flag (checked back to 2011.03).

i think the flag is misleading.  "sspi.w" makes it sound like it'd
call the SPI layer with a NULL read buffer and not simply omit the
output.  what you describe is more like a "quiet" flag.

along these lines, doesnt the general shell provide basic output
redirection to support "silencing" all commands rather than having to
add a "quiet" flag to them all ?  then your script could simply do
"sspi ... >/dev/null" (or however u-boot does it).
-mike