[PATCH v1] Documentation: ACPI: add new rule for gpio-line-names

[Flavio Suligoi <f.suligoi@xxxxxxx>]

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 <f.suligoi@xxxxxxx>
---
 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
     name)
+  - 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::
-- 
2.25.1