[PATCH 1/2] dt-bindings: pinctrl: document Broadcom Northstar pin mux controller
From: zajec5@gmail.com (Rafał Miłecki)
Date: 2018-09-19 21:02:18
Also in:
linux-devicetree, linux-gpio
Subsystem:
open firmware and flattened device tree bindings, pin control subsystem, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Walleij, Linus Torvalds
From: Rafa? Mi?ecki <rafal@milecki.pl> Northstar has mux controller just like Northstar Plus and Northstar2. It's a bit different though (different registers & pins) so it requires its own binding. It's needed to allow other block bindings specify required mux setup. Signed-off-by: Rafa? Mi?ecki <rafal@milecki.pl> --- .../devicetree/bindings/pinctrl/brcm,ns-pinmux.txt | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.txt
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.txt
new file mode 100644
index 000000000000..0e913721ae9e
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.txt@@ -0,0 +1,29 @@ +Broadcom Northstar pins mux controller + +Some of Northstar SoCs's pins can be used for various purposes thanks to the mux +controller. This binding allows describing mux controller and listing available +functions. They can be referenced later by other bindings to let system +configure controller correctly. + +Required properties: +- compatible: brcm,ns-pinmux +- reg: iomem address range of CRU (Central Resource Unit) pin registers +- reg-names: "cru_pins_control" - the only needed & supported reg right now + +List of supported functions and their groups: +- "spi": "spi_grp" + +For documentation of subnodes see: +Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt + +Example: + pinctrl at 1800c1c0 { + compatible = "brcm,ns-pinmux"; + reg = <0x1800c1c0 0x24>; + reg-names = "cru_pins_control"; + + spi { + function = "spi"; + groups = "spi_grp"; + }; + };
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2.13.7