From c8055614385c90accdea4e7a046c5560bccc84cf Mon Sep 17 00:00:00 2001
From: Leonard Crestez <leonard.crestez@nxp.com>
Date: Mon, 13 May 2019 15:06:37 +0300
Subject: [PATCH] imx busfreq: Add API header file

Add sufficient enough definitions so that drivers which call
request_bus_freq and release_bus_freq can compile even if
CONFIG_HAVE_IMX_BUSFREQ is missing.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
 include/linux/busfreq-imx.h | 77 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 include/linux/busfreq-imx.h

--- /dev/null
+++ b/include/linux/busfreq-imx.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2012-2016 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARCH_MXC_BUSFREQ_H__
+#define __ASM_ARCH_MXC_BUSFREQ_H__
+
+#include <linux/notifier.h>
+#include <linux/regulator/consumer.h>
+
+/*
+ * This enumerates busfreq low power mode entry and exit.
+ */
+enum busfreq_event {
+	LOW_BUSFREQ_ENTER,
+	LOW_BUSFREQ_EXIT,
+};
+
+/*
+ * This enumerates the system bus and ddr frequencies in various modes.
+ * BUS_FREQ_HIGH - DDR @ 528MHz, AHB @ 132MHz.
+ * BUS_FREQ_MED - DDR @ 400MHz, AHB @ 132MHz
+ * BUS_FREQ_AUDIO - DDR @ 50MHz/100MHz, AHB @ 24MHz.
+ * BUS_FREQ_LOW  - DDR @ 24MHz, AHB @ 24MHz.
+ * BUS_FREQ_ULTRA_LOW - DDR @ 1MHz, AHB - 3MHz.
+ *
+ * Drivers need to request/release the bus/ddr frequencies based on
+ * their performance requirements. Drivers cannot request/release
+ * BUS_FREQ_ULTRA_LOW mode as this mode is automatically entered from
+ * either BUS_FREQ_AUDIO or BUS_FREQ_LOW
+ * modes.
+ */
+enum bus_freq_mode {
+	BUS_FREQ_HIGH,
+	BUS_FREQ_MED,
+	BUS_FREQ_AUDIO,
+	BUS_FREQ_LOW,
+	BUS_FREQ_ULTRA_LOW,
+};
+
+#if defined(CONFIG_HAVE_IMX_BUSFREQ) && !defined(CONFIG_ARM64)
+extern struct regulator *arm_reg;
+extern struct regulator *soc_reg;
+void request_bus_freq(enum bus_freq_mode mode);
+void release_bus_freq(enum bus_freq_mode mode);
+int register_busfreq_notifier(struct notifier_block *nb);
+int unregister_busfreq_notifier(struct notifier_block *nb);
+int get_bus_freq_mode(void);
+#elif defined(CONFIG_HAVE_IMX_BUSFREQ)
+void request_bus_freq(enum bus_freq_mode mode);
+void release_bus_freq(enum bus_freq_mode mode);
+int get_bus_freq_mode(void);
+#else
+static inline void request_bus_freq(enum bus_freq_mode mode)
+{
+}
+static inline void release_bus_freq(enum bus_freq_mode mode)
+{
+}
+static inline int register_busfreq_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+static inline int unregister_busfreq_notifier(struct notifier_block *nb)
+{
+	return 0;
+}
+static inline int get_bus_freq_mode(void)
+{
+	return BUS_FREQ_HIGH;
+}
+#endif
+#endif