linux-kernel - [PATCH] docs: dt: writing-schema: Document usage of CHECK

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Message-Id: <20221102214300.309347-1-nfraprado@collabora.com>
Date:   Wed,  2 Nov 2022 17:43:00 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, kernel@...labora.com,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: [PATCH] docs: dt: writing-schema: Document usage of CHECK_DTBS make flag

It is possible to run checks on a Devicetree by passing the CHECK_DTBS
flag when building. This is a useful shortcut to the dtbs_check make
target since it avoids checking unrelated Devicetrees, which can take
some time and is unnecessary if no bindings were modified. Document it.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

---

 Documentation/devicetree/bindings/writing-schema.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/writing-schema.rst b/Documentation/devicetree/bindings/writing-schema.rst
index 4a381d20f2b4..55ad556472b4 100644
--- a/Documentation/devicetree/bindings/writing-schema.rst
+++ b/Documentation/devicetree/bindings/writing-schema.rst
@@ -167,6 +167,13 @@ setting the ``DT_SCHEMA_FILES`` variable to a specific schema file or pattern.
     make dt_binding_check DT_SCHEMA_FILES=/gpio/
     make dtbs_check DT_SCHEMA_FILES=trivial-devices.yaml
 
+Note that ``make dtbs_check`` will validate every DT source file that is
+enabled. When making changes to a DT but not to the bindings, a possible
+shortcut to validate only the DT in question is to explicitly build it with
+the ``CHECK_DTBS`` flag enabled. For example::
+
+    make CHECK_DTBS=y mediatek/mt8192-evb.dtb
+
 
 json-schema Resources
 ---------------------
-- 
2.38.1