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Subject[PATCH v2] ARM: dts: document pinctrl-single,pins when #pinctrl-cells = 2
Date
Document the values in pinctrl-single,pins when #pinctrl-cells = <2>

Fixes: 27c90e5e48d0 ("ARM: dts: am33xx-l4: change #pinctrl-cells from 1 to 2")
Reported-by: Trent Piepho <tpiepho@gmail.com>
Link: https://lore.kernel.org/linux-omap/3139716.CMS8C0sQ7x@zen.local/
Signed-off-by: Drew Fustini <drew@beagleboard.org>
---
v2 change:
- rephrase to make it clear that the pin conf value and pin mux value
are OR'd together with #pinctrl-cells = <2>


.../bindings/pinctrl/pinctrl-single.txt | 21 ++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
index e705acd3612c..f903eb4471f8 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
@@ -94,16 +94,23 @@ pinctrl-single,bit-per-mux is set), and uses the common pinctrl bindings as
specified in the pinctrl-bindings.txt document in this directory.

The pin configuration nodes for pinctrl-single are specified as pinctrl
-register offset and value pairs using pinctrl-single,pins. Only the bits
-specified in pinctrl-single,function-mask are updated. For example, setting
-a pin for a device could be done with:
+register offset and values using pinctrl-single,pins. Only the bits specified
+in pinctrl-single,function-mask are updated.
+
+When #pinctrl-cells = 1, then setting a pin for a device could be done with:

pinctrl-single,pins = <0xdc 0x118>;

-Where 0xdc is the offset from the pinctrl register base address for the
-device pinctrl register, and 0x118 contains the desired value of the
-pinctrl register. See the device example and static board pins example
-below for more information.
+Where 0xdc is the offset from the pinctrl register base address for the device
+pinctrl register, and 0x118 contains the desired value of the pinctrl register.
+
+When #pinctrl-cells = 2, then setting a pin for a device could be done with:
+
+ pinctrl-single,pins = <0xdc 0x30 0x07>;
+
+Where 0x30 is the pin configuration value and 0x07 is the pin mux mode value.
+These two values are OR'd together to produce the value stored at offset 0xdc.
+See the device example and static board pins example below for more information.

In case when one register changes more than one pin's mux the
pinctrl-single,bits need to be used which takes three parameters:
--
2.25.1
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