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Date:   Fri, 8 Jan 2021 16:24:47 +0100
From:   Flavio Suligoi <>
To:     Mika Westerberg <>,
        Andy Shevchenko <>,
        "Rafael J . Wysocki" <>,
        Len Brown <>
CC:     <>, <>,
        <>, Flavio Suligoi <>
Subject: [PATCH v1] Documentation: ACPI: add new rule for gpio-line-names

The gpio-line-names lists must respect some rules.

This patch adds a new rule in documentation, to avoid
the use of duplicate names in the same gpiochip.

Signed-off-by: Flavio Suligoi <>
 Documentation/firmware-guide/acpi/gpio-properties.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/firmware-guide/acpi/gpio-properties.rst b/Documentation/firmware-guide/acpi/gpio-properties.rst
index b36aa3e743d8..4e264c16ddff 100644
--- a/Documentation/firmware-guide/acpi/gpio-properties.rst
+++ b/Documentation/firmware-guide/acpi/gpio-properties.rst
@@ -146,6 +146,7 @@ following rules (see also the examples):
     other words, it is not mandatory to fill all the GPIO lines
   - empty names are allowed (two quotation marks ``""`` correspond to an empty
+  - names inside one GPIO controller/expander must be unique
 Example of a GPIO controller of 16 lines, with an incomplete list with two
 empty names::

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