Re: [PATCH v2] checkpatch: add DT compatible string documentation checks

[Joe Perches <joe@perches.com>]

On Tue, 2013-12-03 at 22:17 -0600, Rob Herring wrote:
> From: Rob Herring <rob.herring@calxeda.com>
> 
> This adds a simple check that any compatible strings in DeviceTree dts
> files are present in Documentation/devicetree/bindings. Vendor prefixes
> are also checked for existing in vendor-prefixes.txt These should be
> temporary checks until we have more sophisticated binding schema checking.
> 
> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
> Cc: Grant Likely <grant.likely@linaro.org>
> Cc: Andy Whitcroft <apw@canonical.com>
> Cc: Joe Perches <joe@perches.com>
> ---
> v2:
> - Add vendor string checking against vendor-prefixes.txt
> - Add '_', '.' and '+' as valid compatible string characters
> - Use 'grep -E' instead of egrep

Some more trivial notes:

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -2034,6 +2034,29 @@ sub process {
>  			     "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
>  		}
>  
> +# check for DT compatible documentation
> +		if ($realfile =~ /\.dts/ && $rawline =~ /\+\s*compatible\s*=/) {

this should probably be $rawline =~ /^\+\s*compatible...

> +			my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;
> +
> +			foreach my $compat (@compats) {
> +				my $compat2 = $compat;
> +				my $dt_path = "Documentation/devicetree/bindings/";
> +				$compat2 =~ s/\,[a-z]*\-/\,<\.\*>\-/;
> +				`grep -Erq "$compat|$compat2" $dt_path`;
> +				if ( $? >> 8 ) {
> +					WARN("UNDOCUMENTED_DT_BINDING",
> +					     "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr);
> +				}
> +				my $vendor = $compat;
> +				$vendor =~ s/^([a-zA-Z0-9]+)\,.*/$1/;
> +				`grep -Eq "$vendor" "${dt_path}vendor-prefixes.txt"`;

It maybe simpler to read as:

	my $vendor_path = $dt_path . "vendor-prefixes.txt";
	`grep -Eq $vendor $vendor_path`;

> +				if ( $? >> 8 ) {
> +					WARN("UNDOCUMENTED_DT_VENDOR",
> +					     "DT compatible string vendor \"$vendor\" appears un-documented -- check ${dt_path}vendor-prefixes.txt\n" . $herecurr);

					     "DT compatible string vendor \"$vendor\" appears un-documented -- check $vendor_path\n" . $herecurr)

Also I suggest using the same message type
instead of 2 distinct ones.

Maybe "UNDOCUMENTED_DT_STRING"