dt-binding: clock: Document canaan,k210-clk bindings

Document the device tree bindings of the Canaan Kendryte K210 SoC clock
driver in Documentation/devicetree/bindings/clock/canaan,k210-clk.yaml.
The header file include/dt-bindings/clock/k210-clk.h is modified to
include the complete list of IDs for all clocks of the SoC.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201220085725.19545-3-damien.lemoal@wdc.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/canaan,k210-clk.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/canaan,k210-clk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Canaan Kendryte K210 Clock Device Tree Bindings
+
+maintainers:
+  - Damien Le Moal <damien.lemoal@wdc.com>
+
+description: |
+  Canaan Kendryte K210 SoC clocks driver bindings. The clock
+  controller node must be defined as a child node of the K210
+  system controller node.
+
+  See also:
+  - dt-bindings/clock/k210-clk.h
+
+properties:
+  compatible:
+    const: canaan,k210-clk
+
+  clocks:
+    description:
+      Phandle of the SoC 26MHz fixed-rate oscillator clock.
+
+  '#clock-cells':
+    const: 1
+
+required:
+  - compatible
+  - '#clock-cells'
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/k210-clk.h>
+    clocks {
+      in0: oscillator {
+        compatible = "fixed-clock";
+        #clock-cells = <0>;
+        clock-frequency = <26000000>;
+      };
+    };
+
+    /* ... */
+    sysclk: clock-controller {
+      #clock-cells = <1>;
+      compatible = "canaan,k210-clk";
+      clocks = <&in0>;
+    };

include/dt-bindings/clock/k210-clk.h

@@ -3,18 +3,52 @@
  * Copyright (C) 2019-20 Sean Anderson <seanga2@gmail.com>
  * Copyright (c) 2020 Western Digital Corporation or its affiliates.
  */
-#ifndef K210_CLK_H
-#define K210_CLK_H
+#ifndef CLOCK_K210_CLK_H
+#define CLOCK_K210_CLK_H
 
 /*
- * Arbitrary identifiers for clocks.
- * The structure is: in0 -> pll0 -> aclk -> cpu
- *
- * Since we use the hardware defaults for now, set all these to the same clock.
+ * Kendryte K210 SoC clock identifiers (arbitrary values).
  */
-#define K210_CLK_PLL0   0
-#define K210_CLK_PLL1   0
 #define K210_CLK_ACLK	0
 #define K210_CLK_CPU	0
+#define K210_CLK_SRAM0	1
+#define K210_CLK_SRAM1	2
+#define K210_CLK_AI	3
+#define K210_CLK_DMA	4
+#define K210_CLK_FFT	5
+#define K210_CLK_ROM	6
+#define K210_CLK_DVP	7
+#define K210_CLK_APB0	8
+#define K210_CLK_APB1	9
+#define K210_CLK_APB2	10
+#define K210_CLK_I2S0	11
+#define K210_CLK_I2S1	12
+#define K210_CLK_I2S2	13
+#define K210_CLK_I2S0_M	14
+#define K210_CLK_I2S1_M	15
+#define K210_CLK_I2S2_M	16
+#define K210_CLK_WDT0	17
+#define K210_CLK_WDT1	18
+#define K210_CLK_SPI0	19
+#define K210_CLK_SPI1	20
+#define K210_CLK_SPI2	21
+#define K210_CLK_I2C0	22
+#define K210_CLK_I2C1	23
+#define K210_CLK_I2C2	24
+#define K210_CLK_SPI3	25
+#define K210_CLK_TIMER0	26
+#define K210_CLK_TIMER1	27
+#define K210_CLK_TIMER2	28
+#define K210_CLK_GPIO	29
+#define K210_CLK_UART1	30
+#define K210_CLK_UART2	31
+#define K210_CLK_UART3	32
+#define K210_CLK_FPIOA	33
+#define K210_CLK_SHA	34
+#define K210_CLK_AES	35
+#define K210_CLK_OTP	36
+#define K210_CLK_RTC	37
 
-#endif /* K210_CLK_H */
+#define K210_NUM_CLKS	38
+
+#endif /* CLOCK_K210_CLK_H */