dt-bindings: clock: Add StarFive JH7110 PLL clock generator

Add bindings for the PLL clock generator on the JH7110 RISC-V SoC.

Reviewed-by: Conor Dooley <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Xingyu Wu <[e-mail]>
Reviewed-by: Emil Renner Berthing <[e-mail]>
Signed-off-by: Conor Dooley <[e-mail]>

Documentation/devicetree/bindings/clock/starfive,jh7110-pll.yaml

···
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/starfive,jh7110-pll.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7110 PLL Clock Generator
+
+description:
+  These PLLs are high speed, low jitter frequency synthesizers in the JH7110.
+  Each PLL works in integer mode or fraction mode, with configuration
+  registers in the sys syscon. So the PLLs node should be a child of
+  SYS-SYSCON node.
+  The formula for calculating frequency is
+  Fvco = Fref * (NI + NF) / M / Q1
+
+maintainers:
+  - Xingyu Wu <[e-mail]>
+
+properties:
+  compatible:
+    const: starfive,jh7110-pll
+
+  clocks:
+    maxItems: 1
+    description: Main Oscillator (24 MHz)
+
+  '#clock-cells':
+    const: 1
+    description:
+      See <dt-bindings/clock/starfive,jh7110-crg.h> for valid indices.
+
+required:
+  - compatible
+  - clocks
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller {
+      compatible = "starfive,jh7110-pll";
+      clocks = <&osc>;
+      #clock-cells = <1>;
+    };

include/dt-bindings/clock/starfive,jh7110-crg.h

···
 #ifndef __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
 #define __DT_BINDINGS_CLOCK_STARFIVE_JH7110_CRG_H__
 
+/* PLL clocks */
+#define JH7110_PLLCLK_PLL0_OUT			0
+#define JH7110_PLLCLK_PLL1_OUT			1
+#define JH7110_PLLCLK_PLL2_OUT			2
+#define JH7110_PLLCLK_END			3
+
 /* SYSCRG clocks */
 #define JH7110_SYSCLK_CPU_ROOT			0
 #define JH7110_SYSCLK_CPU_CORE			1