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96 lines
2.8 KiB
Diff
96 lines
2.8 KiB
Diff
From c8055614385c90accdea4e7a046c5560bccc84cf Mon Sep 17 00:00:00 2001
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From: Leonard Crestez <leonard.crestez@nxp.com>
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Date: Mon, 13 May 2019 15:06:37 +0300
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Subject: [PATCH] imx busfreq: Add API header file
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Add sufficient enough definitions so that drivers which call
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request_bus_freq and release_bus_freq can compile even if
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CONFIG_HAVE_IMX_BUSFREQ is missing.
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Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
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---
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include/linux/busfreq-imx.h | 77 +++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 77 insertions(+)
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create mode 100644 include/linux/busfreq-imx.h
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--- /dev/null
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+++ b/include/linux/busfreq-imx.h
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@@ -0,0 +1,77 @@
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+/*
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+ * Copyright 2012-2016 Freescale Semiconductor, Inc. All Rights Reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#ifndef __ASM_ARCH_MXC_BUSFREQ_H__
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+#define __ASM_ARCH_MXC_BUSFREQ_H__
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+
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+#include <linux/notifier.h>
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+#include <linux/regulator/consumer.h>
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+
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+/*
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+ * This enumerates busfreq low power mode entry and exit.
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+ */
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+enum busfreq_event {
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+ LOW_BUSFREQ_ENTER,
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+ LOW_BUSFREQ_EXIT,
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+};
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+
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+/*
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+ * This enumerates the system bus and ddr frequencies in various modes.
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+ * BUS_FREQ_HIGH - DDR @ 528MHz, AHB @ 132MHz.
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+ * BUS_FREQ_MED - DDR @ 400MHz, AHB @ 132MHz
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+ * BUS_FREQ_AUDIO - DDR @ 50MHz/100MHz, AHB @ 24MHz.
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+ * BUS_FREQ_LOW - DDR @ 24MHz, AHB @ 24MHz.
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+ * BUS_FREQ_ULTRA_LOW - DDR @ 1MHz, AHB - 3MHz.
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+ *
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+ * Drivers need to request/release the bus/ddr frequencies based on
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+ * their performance requirements. Drivers cannot request/release
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+ * BUS_FREQ_ULTRA_LOW mode as this mode is automatically entered from
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+ * either BUS_FREQ_AUDIO or BUS_FREQ_LOW
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+ * modes.
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+ */
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+enum bus_freq_mode {
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+ BUS_FREQ_HIGH,
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+ BUS_FREQ_MED,
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+ BUS_FREQ_AUDIO,
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+ BUS_FREQ_LOW,
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+ BUS_FREQ_ULTRA_LOW,
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+};
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+
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+#if defined(CONFIG_HAVE_IMX_BUSFREQ) && !defined(CONFIG_ARM64)
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+extern struct regulator *arm_reg;
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+extern struct regulator *soc_reg;
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+void request_bus_freq(enum bus_freq_mode mode);
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+void release_bus_freq(enum bus_freq_mode mode);
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+int register_busfreq_notifier(struct notifier_block *nb);
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+int unregister_busfreq_notifier(struct notifier_block *nb);
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+int get_bus_freq_mode(void);
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+#elif defined(CONFIG_HAVE_IMX_BUSFREQ)
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+void request_bus_freq(enum bus_freq_mode mode);
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+void release_bus_freq(enum bus_freq_mode mode);
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+int get_bus_freq_mode(void);
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+#else
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+static inline void request_bus_freq(enum bus_freq_mode mode)
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+{
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+}
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+static inline void release_bus_freq(enum bus_freq_mode mode)
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+{
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+}
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+static inline int register_busfreq_notifier(struct notifier_block *nb)
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+{
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+ return 0;
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+}
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+static inline int unregister_busfreq_notifier(struct notifier_block *nb)
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+{
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+ return 0;
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+}
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+static inline int get_bus_freq_mode(void)
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+{
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+ return BUS_FREQ_HIGH;
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+}
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+#endif
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+#endif
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