[U-Boot] [PATCH V3 4/6] sf command: allow default chip select through CONFIG_SPI_FLASH_CS

[Mike Frysinger <vapier@gentoo.org>]

On Tuesday 24 January 2012 11:18:22 Eric Nelson wrote:
> This patch allows a board configuration file to provide a default
> chip-select for serial flash so that first argument to the 'sf' command
> is optional.
> 
> On boards that use the mxc_spi driver and a GPIO for chip select, this
> allows a much simpler command line:
> 	U-Boot> sf probe
> instead of
> 	U-Boot> sf probe 0x5300

NAK (to this version of the patch): missing README update, and other issues 
below

> --- a/common/cmd_sf.c
> +++ b/common/cmd_sf.c
>
> +#ifndef CONFIG_SPI_FLASH_CS
> +	if (argc < 2) {
> +		printf("%s: missing arguments\n", __func__);
>  		return -1;

	return cmd_usage(cmdtp);

> -	if (*endp == ':') {
> -		if (endp[1] == 0)
> -			return -1;
> +	}
> +#else
> +	cs = CONFIG_SPI_FLASH_CS ;
> +#endif

you're setting the default CS, not locking it in.  so a better config knob name 
would be something like:
	CONFIG_SF_DEFAULT_CS
this matches the existing CONFIG_SF_XXX defines

also, you have a spurious space before the semicolon there

>  U_BOOT_CMD(
>  	sf,	5,	1,	do_spi_flash,
>  	"SPI flash sub-system",
> +#ifndef CONFIG_SPI_FLASH_CS
>  	"probe [bus:]cs [hz] [mode]	- init flash device on given SPI bus\n"
> +#else
> +	"probe [[bus:]cs] [hz] [mode]	- init flash device on given SPI bus\n"
> +#endif
>  	"				  and chip select\n"
>  	"sf read addr offset len 	- read `len' bytes starting at\n"
>  	"				  `offset' to memory at `addr'\n"

this is ugly.  i'd rather just omit it and not worry about the syntax being 
perfect.
-mike
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