pinctrl: dt-bindings: samsung: Add header with values used for configuration

Hard-coded pinctrl configuration values are scattered through DTS files.
The numbers are difficult to decode by human, especially without the
datasheet.  Additionally the drive strength differs between S3C64xx,
S5PV210 and Exynos SoC families increasing the confusion.

The header will help making this more readable and maintainable.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -9236,6 +9236,8 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-samsung-soc@vger.kernel.org (moderated for non-subscribers)
 S:	Maintained
 F:	drivers/pinctrl/samsung/
+F:	include/dt-bindings/pinctrl/samsung.h
+F:	Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
 
 PIN CONTROLLER - SINGLE
 M:	Tony Lindgren <tony@atomide.com>

include/dt-bindings/pinctrl/samsung.h

@@ -0,0 +1,57 @@
+/*
+ * Samsung's Exynos pinctrl bindings
+ *
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ * Author: Krzysztof Kozlowski <krzk@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifndef __DT_BINDINGS_PINCTRL_SAMSUNG_H__
+#define __DT_BINDINGS_PINCTRL_SAMSUNG_H__
+
+#define EXYNOS_PIN_PULL_NONE		0
+#define EXYNOS_PIN_PULL_DOWN		1
+#define EXYNOS_PIN_PULL_UP		3
+
+#define S3C64XX_PIN_PULL_NONE		0
+#define S3C64XX_PIN_PULL_DOWN		1
+#define S3C64XX_PIN_PULL_UP		2
+
+/* Pin function in power down mode */
+#define EXYNOS_PIN_PDN_OUT0		0
+#define EXYNOS_PIN_PDN_OUT1		1
+#define EXYNOS_PIN_PDN_INPUT		2
+#define EXYNOS_PIN_PDN_PREV		3
+
+/* Drive strengths for Exynos3250, Exynos4 (all) and Exynos5250 */
+#define EXYNOS4_PIN_DRV_LV1		0
+#define EXYNOS4_PIN_DRV_LV2		2
+#define EXYNOS4_PIN_DRV_LV3		1
+#define EXYNOS4_PIN_DRV_LV4		3
+
+/* Drive strengths for Exynos5260 */
+#define EXYNOS5260_PIN_DRV_LV1		0
+#define EXYNOS5260_PIN_DRV_LV2		1
+#define EXYNOS5260_PIN_DRV_LV4		2
+#define EXYNOS5260_PIN_DRV_LV6		3
+
+/* Drive strengths for Exynos5410, Exynos542x and Exynos5800 */
+#define EXYNOS5420_PIN_DRV_LV1		0
+#define EXYNOS5420_PIN_DRV_LV2		1
+#define EXYNOS5420_PIN_DRV_LV3		2
+#define EXYNOS5420_PIN_DRV_LV4		3
+
+#define EXYNOS_PIN_FUNC_INPUT		0
+#define EXYNOS_PIN_FUNC_OUTPUT		1
+#define EXYNOS_PIN_FUNC_2		2
+#define EXYNOS_PIN_FUNC_3		3
+#define EXYNOS_PIN_FUNC_4		4
+#define EXYNOS_PIN_FUNC_5		5
+#define EXYNOS_PIN_FUNC_6		6
+#define EXYNOS_PIN_FUNC_F		0xf
+
+#endif /* __DT_BINDINGS_PINCTRL_SAMSUNG_H__ */