[U-Boot] [PATCH 2/2] mmc: jz_mmc: Compile-out write support if disabled

[Daniel Schwierzeck]

Am 07.01.19 um 22:13 schrieb Ezequiel Garcia:
> Do not build write support, unless it's enabled.
> 
> In the SPL case, this change will typically remove
> precious bytes (as write support is most often
> not needed in SPL).
> 
> This is important on this platform, where the maximum
> SPL size is 14 KiB.
> 
> With gcc v7.3, this change saves 144 bytes producing:
> 
> size spl/u-boot-spl
>    text	   data	    bss	    dec	    hex	filename
>    9240	    752	    712	  10704	   29d0	spl/u-boot-spl
> 
> To make the code easier to compile-out and more
> readable, a pair of read_data/write_data helpers are created.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel at collabora.com>
> ---
>  drivers/mmc/jz_mmc.c | 105 +++++++++++++++++++++++++------------------
>  1 file changed, 61 insertions(+), 44 deletions(-)
> 

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>

-- 
- Daniel