Add the documentation related to the Berlin pin-controller driver and
explain how to configure this group based controller.
Signed-off-by: Antoine Ténart <antoine.ten...@free-electrons.com>
---
.../bindings/pinctrl/marvell,berlin-pinctrl.txt | 44 ++++++++++++++++++++++
1 file changed, 44 insertions(+)
create mode 100644
Documentation/devicetree/bindings/pinctrl/marvell,berlin-pinctrl.txt
diff --git
a/Documentation/devicetree/bindings/pinctrl/marvell,berlin-pinctrl.txt
b/Documentation/devicetree/bindings/pinctrl/marvell,berlin-pinctrl.txt
new file mode 100644
index 000000000000..c59671ac6b54
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/marvell,berlin-pinctrl.txt
@@ -0,0 +1,44 @@
+* Pin-controller driver for the Marvell Berlin SoCs
+
+The pins controlled by the Marvell Berlin controller are organized in groups.
+Configuration is done by group, so no actual pin information is needed.
+
+Be aware the Marvell Berlin datasheets use the keyword 'mode' for what is
called
+a 'function' in the pin-controller subsystem.
+
+Required properties:
+- compatible: should be one of: "marvell,berlin2-soc-pinctrl",
+ "marvell,berlin2-sysmgr-pinctrl",
+ "marvell,berlin2cd-soc-pinctrl",
+ "marvell,berlin2cd-sysmgr-pinctrl",
+ "marvell,berlin2q-soc-pinctrl"
+ "marvell,berlin2q-sysmgr-pinctrl"
+- reg: registers physical address and length of the pin controller.
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pin-controller bindings used by client devices.
+
+A pin-controller node should contain subnodes representing the pin group
+configurations, one per group. Each subnode has the group name and the muxing
+function used.
+
+Required subnode-properties:
+- marvell,groups: a list of strings describing the group names.
+- marvell,function: a string describing the function used to mux the groups.
+
+Example:
+
+sm_pinctrl: pin-controller@0 {
+ compatible = "marvell,berlin2q-sysmgr-pinctrl";
+ reg = <0xfc0000 0x44>;
+
+ uart0_pmux: uart0-pmux {
+ marvell,groups = "GSM12", "GSM13";
+ marvell,function = "uart0";
+ };
+}
+
+&uart0 {
+ pinctrl-0 = <&uart0_pmux>;
+ pinctrl-names = "default";
+};
--
1.8.3.2
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