dt-bindings: clock: add loongson-2 clock include file

This file defines all Loongson-2 SoC clock indexes, it should be
included in the device tree in which there's device using the
clocks.

Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221129034157.15036-1-zhuyinbo@loongson.cn
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

MAINTAINERS

@@ -12195,6 +12195,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
 F:	drivers/pinctrl/pinctrl-loongson2.c
 
+LOONGSON-2 SOC SERIES CLOCK DRIVER
+M:	Yinbo Zhu <zhuyinbo@loongson.cn>
+L:	linux-clk@vger.kernel.org
+S:	Maintained
+F:	include/dt-bindings/clock/loongson,ls2k-clk.h
+
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
 M:	Sathya Prakash <sathya.prakash@broadcom.com>
 M:	Sreekanth Reddy <sreekanth.reddy@broadcom.com>

include/dt-bindings/clock/loongson,ls2k-clk.h

@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Author: Yinbo Zhu <zhuyinbo@loongson.cn>
+ * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_LOONGSON2_H
+#define __DT_BINDINGS_CLOCK_LOONGSON2_H
+
+#define LOONGSON2_REF_100M				0
+#define LOONGSON2_NODE_PLL				1
+#define LOONGSON2_DDR_PLL				2
+#define LOONGSON2_DC_PLL				3
+#define LOONGSON2_PIX0_PLL				4
+#define LOONGSON2_PIX1_PLL				5
+#define LOONGSON2_NODE_CLK				6
+#define LOONGSON2_HDA_CLK				7
+#define LOONGSON2_GPU_CLK				8
+#define LOONGSON2_DDR_CLK				9
+#define LOONGSON2_GMAC_CLK				10
+#define LOONGSON2_DC_CLK				11
+#define LOONGSON2_APB_CLK				12
+#define LOONGSON2_USB_CLK				13
+#define LOONGSON2_SATA_CLK				14
+#define LOONGSON2_PIX0_CLK				15
+#define LOONGSON2_PIX1_CLK				16
+#define LOONGSON2_CLK_END				17
+
+#endif