pinctrl: add compatible for Amlogic Meson A1 pin controller

Add new compatible name for Amlogic's Meson-A1 pin controller
add a dt-binding header file which document the detail pin names.
Note that A1 doesn't need DS bank reg any more, use gpio reg as
base.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Qianggui Song <qianggui.song@amlogic.com>
Link: https://lore.kernel.org/r/1572004167-24150-2-git-send-email-qianggui.song@amlogic.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/meson,pinctrl.txt

@@ -15,6 +15,7 @@ Required properties for the root node:
 		      "amlogic,meson-axg-aobus-pinctrl"
 		      "amlogic,meson-g12a-periphs-pinctrl"
 		      "amlogic,meson-g12a-aobus-pinctrl"
+		      "amlogic,meson-a1-periphs-pinctrl"
  - reg: address and size of registers controlling irq functionality
 
 === GPIO sub-nodes ===

include/dt-bindings/gpio/meson-a1-gpio.h

@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
+ * Author: Qianggui Song <qianggui.song@amlogic.com>
+ */
+
+#ifndef _DT_BINDINGS_MESON_A1_GPIO_H
+#define _DT_BINDINGS_MESON_A1_GPIO_H
+
+#define GPIOP_0		0
+#define GPIOP_1		1
+#define GPIOP_2		2
+#define GPIOP_3		3
+#define GPIOP_4		4
+#define GPIOP_5		5
+#define GPIOP_6		6
+#define GPIOP_7		7
+#define GPIOP_8		8
+#define GPIOP_9		9
+#define GPIOP_10	10
+#define GPIOP_11	11
+#define GPIOP_12	12
+#define GPIOB_0		13
+#define GPIOB_1		14
+#define GPIOB_2		15
+#define GPIOB_3		16
+#define GPIOB_4		17
+#define GPIOB_5		18
+#define GPIOB_6		19
+#define GPIOX_0		20
+#define GPIOX_1		21
+#define GPIOX_2		22
+#define GPIOX_3		23
+#define GPIOX_4		24
+#define GPIOX_5		25
+#define GPIOX_6		26
+#define GPIOX_7		27
+#define GPIOX_8		28
+#define GPIOX_9		29
+#define GPIOX_10	30
+#define GPIOX_11	31
+#define GPIOX_12	32
+#define GPIOX_13	33
+#define GPIOX_14	34
+#define GPIOX_15	35
+#define GPIOX_16	36
+#define GPIOF_0		37
+#define GPIOF_1		38
+#define GPIOF_2		39
+#define GPIOF_3		40
+#define GPIOF_4		41
+#define GPIOF_5		42
+#define GPIOF_6		43
+#define GPIOF_7		44
+#define GPIOF_8		45
+#define GPIOF_9		46
+#define GPIOF_10	47
+#define GPIOF_11	48
+#define GPIOF_12	49
+#define GPIOA_0		50
+#define GPIOA_1		51
+#define GPIOA_2		52
+#define GPIOA_3		53
+#define GPIOA_4		54
+#define GPIOA_5		55
+#define GPIOA_6		56
+#define GPIOA_7		57
+#define GPIOA_8		58
+#define GPIOA_9		59
+#define GPIOA_10	60
+#define GPIOA_11	61
+
+#endif /* _DT_BINDINGS_MESON_A1_GPIO_H */