clk: meson: Add G12A AO Clock + Reset Controller

Add the Amlogic G12A AO Clock and Reset controller driver handling
generation of Always-On clocks :
- AO Clocks and Reset for Always-On modules
- 32K Generation for USB and CEC
- SAR ADC controller clock

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lkml.kernel.org/r/20190212162859.20743-3-narmstrong@baylibre.com

drivers/clk/meson/g12a-aoclk.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright (c) 2019 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+
+#ifndef __G12A_AOCLKC_H
+#define __G12A_AOCLKC_H
+
+/*
+ * CLKID index values
+ *
+ * These indices are entirely contrived and do not map onto the hardware.
+ * It has now been decided to expose everything by default in the DT header:
+ * include/dt-bindings/clock/g12a-aoclkc.h. Only the clocks ids we don't want
+ * to expose, such as the internal muxes and dividers of composite clocks,
+ * will remain defined here.
+ */
+#define CLKID_AO_SAR_ADC_SEL	16
+#define CLKID_AO_SAR_ADC_DIV	17
+#define CLKID_AO_CTS_OSCIN	19
+#define CLKID_AO_32K_PRE	20
+#define CLKID_AO_32K_DIV	21
+#define CLKID_AO_32K_SEL	22
+#define CLKID_AO_CEC_PRE	24
+#define CLKID_AO_CEC_DIV	25
+#define CLKID_AO_CEC_SEL	26
+
+#define NR_CLKS	29
+
+#include <dt-bindings/clock/g12a-aoclkc.h>
+#include <dt-bindings/reset/g12a-aoclkc.h>
+
+#endif /* __G12A_AOCLKC_H */