[PATCH v1] Documentation: ACPI: explain how to use gpio-line-names

Flavio Suligoi
2020-11-11T13:04:45Z

The "gpio-line-names" declaration is not fully
documented, so can be useful to add some important
information and one more example.

This commit also fix a trivial syntax error.

Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
---
.../firmware-guide/acpi/gpio-properties.rst | 58 ++++++++++++++++++-
1 file changed, 56 insertions(+), 2 deletions(-)

diff --git a/Documentation/firmware-guide/acpi/gpio-properties.rst b/Documentation/firmware-guide/acpi/gpio-properties.rst
index bb6d74f23ee0..a9f4dfa932cc 100644
--- a/Documentation/firmware-guide/acpi/gpio-properties.rst
+++ b/Documentation/firmware-guide/acpi/gpio-properties.rst
@@ -107,7 +107,61 @@ Example::

- gpio-line-names

-Example::
+The "gpio-line-names" declaration is a list of strings ("names"), which
+describes each line/pin of a GPIO controller/expander.
+This list, contained in a package, must be inserted inside the GPIO controller
+declaration of an ACPI table (typically inside the DSDT).
+The gpio-line-names list must respect the following rules (see also the
+examples):
+
+ - the first name in the list corresponds with the first line/pin of the GPIO
+ controller/expander
+ - the names inside the list must be consecutive (no "holes" are permitted)
+ - the list can be incomplete and can end before the last GPIO line: in
+ other words, it is not mandatory to fill all the GPIO lines
+ - empty names are allowed (two quotation marks "" correspond to an empty name)
+
+Example of a GPIO controller of 16 lines, with an incomplete list with two
+empty names::
+
+ Package () {
+ "gpio-line-names",
+ Package () {
+ "pin_0",
+ "pin_1",
+ "",
+ "",
+ "pin_3",
+ "pin_4_push_button"
+ }
+ }
+
+At runtime, the above declaration produces the following result (using the
+"libgpiod" tools)::
+
+ root@debian:~# gpioinfo gpiochip4
+ gpiochip4 - 16 lines:
+ line 0: "pin_0" unused input active-high
+ line 1: "pin_1" unused input active-high
+ line 2: unnamed unused input active-high
+ line 3: unnamed unused input active-high
+ line 4: "pin_3" unused input active-high
+ line 5: "pin_4_push_button" unused input active-high
+ line 6: unnamed unused input active-high
+ line 7 unnamed unused input active-high
+ line 8: unnamed unused input active-high
+ line 9: unnamed unused input active-high
+ line 10: unnamed unused input active-high
+ line 11: unnamed unused input active-high
+ line 12: unnamed unused input active-high
+ line 13: unnamed unused input active-high
+ line 14: unnamed unused input active-high
+ line 15: unnamed unused input active-high
+ root@debian:~# gpiofind pin_4_push_button
+ gpiochip4 5
+ root@debian:~#
+
+Another example::

Package () {
"gpio-line-names",
@@ -191,7 +245,7 @@ The driver might expect to get the right GPIO when it does::
but since there is no way to know the mapping between "reset" and
the GpioIo() in _CRS desc will hold ERR_PTR(-ENOENT).

-The driver author can solve this by passing the mapping explictly
+The driver author can solve this by passing the mapping explicitly
(the recommended way and documented in the above chapter).

The ACPI GPIO mapping tables should not contaminate drivers that are not
--
2.25.1