linux-kernel - [PATCH 1/3] devicetree: bindings: pinctrl: Add binding for ti,da850-pupd

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Message-Id: <1479871767-20160-2-git-send-email-david@lechnology.com>
Date:   Tue, 22 Nov 2016 21:29:25 -0600
From:   David Lechner <david@...hnology.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>
Cc:     David Lechner <david@...hnology.com>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Axel Haslam <ahaslam@...libre.com>,
        Alexandre Bailon <abailon@...libre.com>,
        Bartosz Gołaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 1/3] devicetree: bindings: pinctrl: Add binding for ti,da850-pupd

Device-tree bindings for TI DA8XX/OMAP-L138/AM18XX pullup/pulldown
pinconf controller.

Signed-off-by: David Lechner <david@...hnology.com>
---
 .../devicetree/bindings/pinctrl/ti,da850-pupd.txt  | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/ti,da850-pupd.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/ti,da850-pupd.txt b/Documentation/devicetree/bindings/pinctrl/ti,da850-pupd.txt
new file mode 100644
index 0000000..7f29805
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/ti,da850-pupd.txt
@@ -0,0 +1,55 @@
+* Pin configuration for TI DA850/OMAP-L138/AM18x
+
+These SoCs have a separate controller for setting bias (internal pullup/down).
+Bias can only be selected for groups rather than individual pins.
+
+Required Properties:
+
+  - compatible: Must be "ti,da850-pupd"
+  - reg: Base address and length of the memory resource used by the pullup/down
+    controller hardware module.
+
+The controller node also acts as a container for pin group configuration nodes.
+The names of these groups are ignored.
+
+Pin Group Node Properties:
+
+- groups: An array of strings, each string containing the name of a pin group.
+          Valid names are "cp0".."cp31".
+
+The pin configuration parameters use the generic pinconf bindings defined in
+pinctrl-bindings.txt in this directory. The supported parameters are
+bias-disable, bias-pull-up, bias-pull-down.
+
+
+Example
+-------
+
+In common dtsi file:
+
+	pinconf: pin-controller@...00c {
+		compatible = "ti,da850-pupd";
+		reg = <0x22c00c 0x8>;
+	};
+
+In board-specific file:
+
+	&pinconf {
+		pinctrl-0 = <&pinconf_bias_groups>;
+		pinctrl-names = "default";
+
+		pinconf_bias_groups: bias-groups {
+			pull-up {
+				groups = "cp30", "cp31";
+				bias-pull-up;
+			};
+			pull-down {
+				groups = "cp29", "cp28";
+				bias-pull-down;
+			};
+			disable {
+				groups = "cp27", "cp26";
+				bias-disable;
+			};
+		};
+	};
-- 
2.7.4