[PATCH v4 1/2] Doc: dt: binding: imx: update pinctrl doc for imx6sll

[Bai Ping]

Add pinctrl binding doc update for imx6sll.

Signed-off-by: Bai Ping <ping.bai at nxp.com>
---
 changes v2-v3:
 - add generic config binding

 change v3->v4:
 - add SION bit define
 - fix typo
 - move the pin header file to dts patch.
---
 .../bindings/pinctrl/fsl,imx6sll-pinctrl.txt       | 71 ++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/fsl,imx6sll-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/fsl,imx6sll-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/fsl,imx6sll-pinctrl.txt
new file mode 100644
index 0000000..b830a86
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/fsl,imx6sll-pinctrl.txt
@@ -0,0 +1,71 @@
+* Freescale i.MX6 SLL IOMUX Controller
+
+Please refer to the pinctrl-bindings.txt in this directory for generic pinctrl binding.
+
+=== Pin Controller Node ===
+
+Required properties:
+- compatible: "fsl,imx6sll-iomuxc"
+- reg: Should contain the base physical address and size of the iomuxc registers.
+
+
+=== Pin Configuration Node ===
+- pinmux: One integers array, represents a group of pins mux setting.
+	The format is pinmux = <PIN_FUNC_ID>, PIN_FUNC_ID is a pin working on
+	a specific function. which can be found in imx6sll-pinfunc.h under device
+	tree source folder. Please also refer to i.MX6SLL Reference Manual for detailed
+	CONFIG settings.
+
+Optional Properties:
+- drive-strength		Integer. Controls Drive Strength
+					0: HI-Z
+					1: 260 ohm at 3.3v, 150 ohm at 1.8v
+					2: 130 ohm at 3.3v, 75 ohm at 1.8v
+					3: 86 ohm at 3.3v, 50 ohm at 1.8v
+					4: 65 ohm at 3.3v, 37 ohm at 1.8v
+					5: 52 ohm at 3.3v, 30 ohm at 1.8v
+					6: 43 ohm at 3.3v, 25 ohm at 1.8v
+					7: 37 ohm at 3.3v, 21 ohm at 1.8v
+- drive-open-drain		Bool. Enable Pin Open-drian
+- slew-rate:			Integer. Controls Slew Rate
+					0: slow
+					1: fast
+- fsl,pin-speed:		Integer, Controls the pin speed
+					0: reserverd
+					1: low(50 MHz)
+					2: medium(100 MHz)
+					3: maximum(200 MHz)
+
+- bias-pull-down:		Integer. Pull down on pin
+					0: 100K ohm pull down
+- bias-pull-up:			Integer. Pull up on pin
+					1: 47K ohm pull up
+					2: 100K ohm pull up
+					3: 22K ohm pull up
+- input-schmitt-enable:		bool, Schmitt trigger input enable
+- input-enable			bool, Software input on enbale
+- fsl,low-voltage-enable:	Integer. low voltage enable
+					0: High voltage
+					1: Low voltage
+Examples:
+#include "imx6sll-pinfunc.h"
+
+/* Pin Controller Node */
+
+iomuxc: iomuxc at 020e0000 {
+		compatible = "fsl,imx6sll-iomuxc";
+		reg = <0x020e0000 0x4000>;
+
+	/* Pin configuration Node */
+	pinctrl_uart1: uart1grp {
+		pinmux = <
+			MX6SLL_PAD_UART1_TXD__UART1_DCE_TX
+			MX6SLL_PAD_UART1_RXD__UART1_DCE_RX
+		>;
+		slew-rate = <0x1>;
+		drive-strength = <0x6>;
+		fsl,pin-speed = <0x2>;
+		bias-pull-up = <0x2>;
+		input-schmitt-enable;
+	};
+};
-- 
1.9.1