dt-bindings: clock: document Amlogic S4 SoC PLL clock controller

Add the S4 PLL clock controller dt-bindings in the S4 SoC family.
Signed-off-by: Yu Tu <yu.tu@amlogic.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230904075504.23263-2-yu.tu@amlogic.comSigned-off-by: Jerome Brunet <jbrunet@baylibre.com>

Documentation/devicetree/bindings/clock/amlogic,s4-pll-clkc.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2022-2023 Amlogic, Inc. All rights reserved
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/amlogic,s4-pll-clkc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic S4 PLL Clock Controller
+
+maintainers:
+  - Yu Tu <yu.tu@amlogic.com>
+
+properties:
+  compatible:
+    const: amlogic,s4-pll-clkc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: xtal
+
+  "#clock-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    clkc_pll: clock-controller@fe008000 {
+      compatible = "amlogic,s4-pll-clkc";
+      reg = <0xfe008000 0x1e8>;
+      clocks = <&xtal>;
+      clock-names = "xtal";
+      #clock-cells = <1>;
+    };
+
+...

include/dt-bindings/clock/amlogic,s4-pll-clkc.h

+/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
+/*
+ * Copyright (c) 2022-2023 Amlogic, Inc. All rights reserved.
+ * Author: Yu Tu <yu.tu@amlogic.com>
+ */
+
+#ifndef _DT_BINDINGS_CLOCK_AMLOGIC_S4_PLL_CLKC_H
+#define _DT_BINDINGS_CLOCK_AMLOGIC_S4_PLL_CLKC_H
+
+#define CLKID_FIXED_PLL_DCO		0
+#define CLKID_FIXED_PLL			1
+#define CLKID_FCLK_DIV2_DIV		2
+#define CLKID_FCLK_DIV2			3
+#define CLKID_FCLK_DIV3_DIV		4
+#define CLKID_FCLK_DIV3			5
+#define CLKID_FCLK_DIV4_DIV		6
+#define CLKID_FCLK_DIV4			7
+#define CLKID_FCLK_DIV5_DIV		8
+#define CLKID_FCLK_DIV5			9
+#define CLKID_FCLK_DIV7_DIV		10
+#define CLKID_FCLK_DIV7			11
+#define CLKID_FCLK_DIV2P5_DIV		12
+#define CLKID_FCLK_DIV2P5		13
+#define CLKID_GP0_PLL_DCO		14
+#define CLKID_GP0_PLL			15
+#define CLKID_HIFI_PLL_DCO		16
+#define CLKID_HIFI_PLL			17
+#define CLKID_HDMI_PLL_DCO		18
+#define CLKID_HDMI_PLL_OD		19
+#define CLKID_HDMI_PLL			20
+#define CLKID_MPLL_50M_DIV		21
+#define CLKID_MPLL_50M			22
+#define CLKID_MPLL_PREDIV		23
+#define CLKID_MPLL0_DIV			24
+#define CLKID_MPLL0			25
+#define CLKID_MPLL1_DIV			26
+#define CLKID_MPLL1			27
+#define CLKID_MPLL2_DIV			28
+#define CLKID_MPLL2			29
+#define CLKID_MPLL3_DIV			30
+#define CLKID_MPLL3			31
+
+#endif /* _DT_BINDINGS_CLOCK_AMLOGIC_S4_PLL_CLKC_H */