dt-bindings: clock: add meson axg audio clock controller bindings

Export the clock ids dt-bindings usable by the consumers of the clock
controller and add the documentation for the device tree bindings of
the audio clock controller of the A113 based SoCs.
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

Documentation/devicetree/bindings/clock/amlogic,axg-audio-clkc.txt

+* Amlogic AXG Audio Clock Controllers
+
+The Amlogic AXG audio clock controller generates and supplies clock to the
+other elements of the audio subsystem, such as fifos, i2s, spdif and pdm
+devices.
+
+Required Properties:
+
+- compatible	: should be "amlogic,axg-audio-clkc" for the A113X and A113D
+- reg		: physical base address of the clock controller and length of
+		  memory mapped region.
+- clocks	: a list of phandle + clock-specifier pairs for the clocks listed
+		  in clock-names.
+- clock-names	: must contain the following:
+		  * "pclk" - Main peripheral bus clock
+		  may contain the following:
+		  * "mst_in[0-7]" - 8 input plls to generate clock signals
+		  * "slv_sclk[0-9]" - 10 slave bit clocks provided by external
+				      components.
+		  * "slv_lrclk[0-9]" - 10 slave sample clocks provided by external
+				       components.
+- resets	: phandle of the internal reset line
+- #clock-cells	: should be 1.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. All available clocks are defined as
+preprocessor macros in the dt-bindings/clock/axg-audio-clkc.h header and can be
+used in device tree sources.
+
+Example:
+
+clkc_audio: clock-controller@0 {
+	compatible = "amlogic,axg-audio-clkc";
+	reg = <0x0 0x0 0x0 0xb4>;
+	#clock-cells = <1>;
+
+	clocks = <&clkc CLKID_AUDIO>,
+		 <&clkc CLKID_MPLL0>,
+		 <&clkc CLKID_MPLL1>,
+		 <&clkc CLKID_MPLL2>,
+		 <&clkc CLKID_MPLL3>,
+		 <&clkc CLKID_HIFI_PLL>,
+		 <&clkc CLKID_FCLK_DIV3>,
+		 <&clkc CLKID_FCLK_DIV4>,
+		 <&clkc CLKID_GP0_PLL>;
+	clock-names = "pclk",
+		      "mst_in0",
+		      "mst_in1",
+		      "mst_in2",
+		      "mst_in3",
+		      "mst_in4",
+		      "mst_in5",
+		      "mst_in6",
+		      "mst_in7";
+	resets = <&reset RESET_AUDIO>;
+};

include/dt-bindings/clock/axg-audio-clkc.h

+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/*
+ * Copyright (c) 2018 Baylibre SAS.
+ * Author: Jerome Brunet <jbrunet@baylibre.com>
+ */
+
+#ifndef __AXG_AUDIO_CLKC_BINDINGS_H
+#define __AXG_AUDIO_CLKC_BINDINGS_H
+
+#define AUD_CLKID_SLV_SCLK0		9
+#define AUD_CLKID_SLV_SCLK1		10
+#define AUD_CLKID_SLV_SCLK2		11
+#define AUD_CLKID_SLV_SCLK3		12
+#define AUD_CLKID_SLV_SCLK4		13
+#define AUD_CLKID_SLV_SCLK5		14
+#define AUD_CLKID_SLV_SCLK6		15
+#define AUD_CLKID_SLV_SCLK7		16
+#define AUD_CLKID_SLV_SCLK8		17
+#define AUD_CLKID_SLV_SCLK9		18
+#define AUD_CLKID_SLV_LRCLK0		19
+#define AUD_CLKID_SLV_LRCLK1		20
+#define AUD_CLKID_SLV_LRCLK2		21
+#define AUD_CLKID_SLV_LRCLK3		22
+#define AUD_CLKID_SLV_LRCLK4		23
+#define AUD_CLKID_SLV_LRCLK5		24
+#define AUD_CLKID_SLV_LRCLK6		25
+#define AUD_CLKID_SLV_LRCLK7		26
+#define AUD_CLKID_SLV_LRCLK8		27
+#define AUD_CLKID_SLV_LRCLK9		28
+#define AUD_CLKID_DDR_ARB		29
+#define AUD_CLKID_PDM			30
+#define AUD_CLKID_TDMIN_A		31
+#define AUD_CLKID_TDMIN_B		32
+#define AUD_CLKID_TDMIN_C		33
+#define AUD_CLKID_TDMIN_LB		34
+#define AUD_CLKID_TDMOUT_A		35
+#define AUD_CLKID_TDMOUT_B		36
+#define AUD_CLKID_TDMOUT_C		37
+#define AUD_CLKID_FRDDR_A		38
+#define AUD_CLKID_FRDDR_B		39
+#define AUD_CLKID_FRDDR_C		40
+#define AUD_CLKID_TODDR_A		41
+#define AUD_CLKID_TODDR_B		42
+#define AUD_CLKID_TODDR_C		43
+#define AUD_CLKID_LOOPBACK		44
+#define AUD_CLKID_SPDIFIN		45
+#define AUD_CLKID_SPDIFOUT		46
+#define AUD_CLKID_RESAMPLE		47
+#define AUD_CLKID_POWER_DETECT		48
+#define AUD_CLKID_MST_A_MCLK		49
+#define AUD_CLKID_MST_B_MCLK		50
+#define AUD_CLKID_MST_C_MCLK		51
+#define AUD_CLKID_MST_D_MCLK		52
+#define AUD_CLKID_MST_E_MCLK		53
+#define AUD_CLKID_MST_F_MCLK		54
+#define AUD_CLKID_SPDIFOUT_CLK		55
+#define AUD_CLKID_SPDIFIN_CLK		56
+#define AUD_CLKID_PDM_DCLK		57
+#define AUD_CLKID_PDM_SYSCLK		58
+#define AUD_CLKID_MST_A_SCLK		79
+#define AUD_CLKID_MST_B_SCLK		80
+#define AUD_CLKID_MST_C_SCLK		81
+#define AUD_CLKID_MST_D_SCLK		82
+#define AUD_CLKID_MST_E_SCLK		83
+#define AUD_CLKID_MST_F_SCLK		84
+#define AUD_CLKID_MST_A_LRCLK		86
+#define AUD_CLKID_MST_B_LRCLK		87
+#define AUD_CLKID_MST_C_LRCLK		88
+#define AUD_CLKID_MST_D_LRCLK		89
+#define AUD_CLKID_MST_E_LRCLK		90
+#define AUD_CLKID_MST_F_LRCLK		91
+#define AUD_CLKID_TDMIN_A_SCLK_SEL	116
+#define AUD_CLKID_TDMIN_B_SCLK_SEL	117
+#define AUD_CLKID_TDMIN_C_SCLK_SEL	118
+#define AUD_CLKID_TDMIN_LB_SCLK_SEL	119
+#define AUD_CLKID_TDMOUT_A_SCLK_SEL	120
+#define AUD_CLKID_TDMOUT_B_SCLK_SEL	121
+#define AUD_CLKID_TDMOUT_C_SCLK_SEL	122
+#define AUD_CLKID_TDMIN_A_SCLK		123
+#define AUD_CLKID_TDMIN_B_SCLK		124
+#define AUD_CLKID_TDMIN_C_SCLK		125
+#define AUD_CLKID_TDMIN_LB_SCLK		126
+#define AUD_CLKID_TDMOUT_A_SCLK		127
+#define AUD_CLKID_TDMOUT_B_SCLK		128
+#define AUD_CLKID_TDMOUT_C_SCLK		129
+#define AUD_CLKID_TDMIN_A_LRCLK		130
+#define AUD_CLKID_TDMIN_B_LRCLK		131
+#define AUD_CLKID_TDMIN_C_LRCLK		132
+#define AUD_CLKID_TDMIN_LB_LRCLK	133
+#define AUD_CLKID_TDMOUT_A_LRCLK	134
+#define AUD_CLKID_TDMOUT_B_LRCLK	135
+#define AUD_CLKID_TDMOUT_C_LRCLK	136
+
+#endif /* __AXG_AUDIO_CLKC_BINDINGS_H */