arm64: dts: Add pinctrl DT nodes for Stingray SOC

This patch adds pinctrl and pinmux related DT nodes for
Stingray SOC.

For manageability, pinctrl and pinmum DT nodes are added
as separate DTSi file and included in main DTSi file.
Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com>
Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Vikram Prakash <vikram.prakash@broadcom.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm64/boot/dts/broadcom/stingray/stingray.dtsi

@@ -259,6 +259,8 @@ hsls {
 		#size-cells = <1>;
 		ranges = <0x0 0x0 0x68900000 0x17700000>;
 
+		#include "stingray-pinctrl.dtsi"
+
 		uart0: uart@00100000 {
 			device_type = "serial";
 			compatible = "snps,dw-apb-uart";

include/dt-bindings/pinctrl/brcm,pinctrl-stingray.h

+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2017 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __DT_BINDINGS_PINCTRL_BRCM_STINGRAY_H__
+#define __DT_BINDINGS_PINCTRL_BRCM_STINGRAY_H__
+
+/* Alternate functions available in MUX controller */
+#define MODE_NITRO				0
+#define MODE_NAND				1
+#define MODE_PNOR				2
+#define MODE_GPIO				3
+
+/* Pad configuration attribute */
+#define PAD_SLEW_RATE_ENA			(1 << 0)
+#define PAD_SLEW_RATE_ENA_MASK			(1 << 0)
+
+#define PAD_DRIVE_STRENGTH_2_MA			(0 << 1)
+#define PAD_DRIVE_STRENGTH_4_MA			(1 << 1)
+#define PAD_DRIVE_STRENGTH_6_MA			(2 << 1)
+#define PAD_DRIVE_STRENGTH_8_MA			(3 << 1)
+#define PAD_DRIVE_STRENGTH_10_MA		(4 << 1)
+#define PAD_DRIVE_STRENGTH_12_MA		(5 << 1)
+#define PAD_DRIVE_STRENGTH_14_MA		(6 << 1)
+#define PAD_DRIVE_STRENGTH_16_MA		(7 << 1)
+#define PAD_DRIVE_STRENGTH_MASK			(7 << 1)
+
+#define PAD_PULL_UP_ENA				(1 << 4)
+#define PAD_PULL_UP_ENA_MASK			(1 << 4)
+
+#define PAD_PULL_DOWN_ENA			(1 << 5)
+#define PAD_PULL_DOWN_ENA_MASK			(1 << 5)
+
+#define PAD_INPUT_PATH_DIS			(1 << 6)
+#define PAD_INPUT_PATH_DIS_MASK			(1 << 6)
+
+#define PAD_HYSTERESIS_ENA			(1 << 7)
+#define PAD_HYSTERESIS_ENA_MASK			(1 << 7)
+
+#endif