[PATCH] Add a short note on pinctrl_get_group_pins to pinctrl.txt

[Christian Ruppert]

This patch adds a short description of how to use the newly added
pinctrl_get_group_pins function to the pinctrl documentation.

Signed-off-by: Christian Ruppert <christian.ruppert@xxxxxxxxxx>
---
 Documentation/pinctrl.txt |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt
index c0ffd30..a7929cb 100644
--- a/Documentation/pinctrl.txt
+++ b/Documentation/pinctrl.txt
@@ -358,7 +358,12 @@ static struct pinctrl_gpio_range gpio_range = {
 	.gc = &chip;
 };
 
-In this case the pin_base property will be ignored.
+In this case the pin_base property will be ignored. If the name of a pin
+group is known, the pins and npins elements of the above structure can be
+initialised using the function pinctrl_get_group_pins(), e.g. for pin
+group "foo":
+
+pinctrl_get_group_pins(pctl, "foo", &gpio_range.pins, &gpio_range.npins);
 
 When GPIO-specific functions in the pin control subsystem are called, these
 ranges will be used to look up the appropriate pin controller by inspecting
-- 
1.7.1

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