dt-bindings: clock: loongson2: Add Loongson-2K0300 compatible

Document the clock controller shipped in Loongson-2K0300 SoC, which
generates various clock signals for SoC peripherals. Differing from
previous generations of SoCs, LS2K0300 requires a 120MHz external clock
input.

Signed-off-by: Yao Zi <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Yanteng Si <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/loongson,ls2k-clk.yaml

···
 properties:
   compatible:
     enum:
+      - loongson,ls2k0300-clk
       - loongson,ls2k0500-clk
       - loongson,ls2k-clk  # This is for Loongson-2K1000
       - loongson,ls2k2000-clk
···
     maxItems: 1
 
   clocks:
-    items:
-      - description: 100m ref
+    maxItems: 1
 
   clock-names:
     items:
···
       ID in its "clocks" phandle cell. See include/dt-bindings/clock/loongson,ls2k-clk.h
       for the full list of Loongson-2 SoC clock IDs.
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: loongson,ls2k0300-clk
+    then:
+      properties:
+        clock-names: false
+    else:
+      required:
+        - clock-names
+
 required:
   - compatible
   - reg
   - clocks
-  - clock-names
   - '#clock-cells'
 
 additionalProperties: false

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

···
 #define LOONGSON2_I2S_CLK	33
 #define LOONGSON2_MISC_CLK	34
 
+#define LS2K0300_CLK_STABLE		0
+#define LS2K0300_NODE_PLL		1
+#define LS2K0300_DDR_PLL		2
+#define LS2K0300_PIX_PLL		3
+#define LS2K0300_CLK_THSENS		4
+#define LS2K0300_CLK_NODE_DIV		5
+#define LS2K0300_CLK_NODE_PLL_GATE	6
+#define LS2K0300_CLK_NODE_SCALE		7
+#define LS2K0300_CLK_NODE_GATE		8
+#define LS2K0300_CLK_GMAC_DIV		9
+#define LS2K0300_CLK_GMAC_GATE		10
+#define LS2K0300_CLK_I2S_DIV		11
+#define LS2K0300_CLK_I2S_SCALE		12
+#define LS2K0300_CLK_I2S_GATE		13
+#define LS2K0300_CLK_DDR_DIV		14
+#define LS2K0300_CLK_DDR_GATE		15
+#define LS2K0300_CLK_NET_DIV		16
+#define LS2K0300_CLK_NET_GATE		17
+#define LS2K0300_CLK_DEV_DIV		18
+#define LS2K0300_CLK_DEV_GATE		19
+#define LS2K0300_CLK_PIX_DIV		20
+#define LS2K0300_CLK_PIX_PLL_GATE	21
+#define LS2K0300_CLK_PIX_SCALE		22
+#define LS2K0300_CLK_PIX_GATE		23
+#define LS2K0300_CLK_GMACBP_DIV		24
+#define LS2K0300_CLK_GMACBP_GATE	25
+#define LS2K0300_CLK_USB_SCALE		26
+#define LS2K0300_CLK_USB_GATE		27
+#define LS2K0300_CLK_APB_SCALE		28
+#define LS2K0300_CLK_APB_GATE		29
+#define LS2K0300_CLK_BOOT_SCALE		30
+#define LS2K0300_CLK_BOOT_GATE		31
+#define LS2K0300_CLK_SDIO_SCALE		32
+#define LS2K0300_CLK_SDIO_GATE		33
+#define LS2K0300_CLK_GMAC_IN		34
+
 #endif