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Date:   Thu, 9 Aug 2018 17:53:48 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org,
        Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] checkpatch: DT bindings should be a separate patch

On Thu,  9 Aug 2018 14:50:32 -0600 Rob Herring <robh@...nel.org> wrote:

> Devicetree bindings should be their own patch as documented in
> Documentation/devicetree/bindings/submitting-patches.txt section I.1.
> This is because bindings are logically independent from a driver
> implementation, they have a different maintainer (even though they often
> are applied via the same tree), and it makes for a cleaner history in
> the DT only tree created with git-filter-branch.
> 
> ...
>
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2236,6 +2236,7 @@ sub process {
>  	our $clean = 1;
>  	my $signoff = 0;
>  	my $is_patch = 0;
> +	my $is_binding_patch = -1;
>  	my $in_header_lines = $file ? 0 : 1;
>  	my $in_commit_log = 0;		#Scanning lines before patch
>  	my $has_commit_log = 0;		#Encountered lines before patch
> @@ -2485,6 +2486,27 @@ sub process {
>  				$check = $check_orig;
>  			}
>  			$checklicenseline = 1;
> +
> +			if ($realfile !~ /MAINTAINERS/) {
> +				my $mixed = 0;
> +				if ($realfile =~ /(Documentation\/devicetree|include\/dt-bindings).*/) {
> +					if ($is_binding_patch == 0) {
> +						$mixed = 1;
> +					}
> +					$is_binding_patch = 1;
> +				} else {
> +					if ($is_binding_patch == 1) {
> +						$mixed = 1;
> +					}
> +					$is_binding_patch = 0;
> +				}
> +
> +				if ($mixed == 1) {
> +					WARN("DT_SPLIT_BINDING_PATCH",
> +					     "DT binding docs and includes should be a separate patch\n");

A pointer to Documentation/devicetree/bindings/submitting-patches.txt
might be helpful?

> +				}
> +			}
> +
>  			next;
>  		}

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