target/linux/layerscape/patches-5.4/802-can-0001-imx-busfreq-Add-API-header-file.patch

   1 From c8055614385c90accdea4e7a046c5560bccc84cf Mon Sep 17 00:00:00 2001
   2 From: Leonard Crestez <leonard.crestez@nxp.com>
   3 Date: Mon, 13 May 2019 15:06:37 +0300
   4 Subject: [PATCH] imx busfreq: Add API header file
   5
   6 Add sufficient enough definitions so that drivers which call
   7 request_bus_freq and release_bus_freq can compile even if
   8 CONFIG_HAVE_IMX_BUSFREQ is missing.
   9
  10 Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
  11 ---
  12  include/linux/busfreq-imx.h | 77 +++++++++++++++++++++++++++++++++++++++++++++
  13  1 file changed, 77 insertions(+)
  14  create mode 100644 include/linux/busfreq-imx.h
  15
  16 --- /dev/null
  17 +++ b/include/linux/busfreq-imx.h
  18 @@ -0,0 +1,77 @@
  19 +/*
  20 + * Copyright 2012-2016 Freescale Semiconductor, Inc. All Rights Reserved.
  21 + *
  22 + * This program is free software; you can redistribute it and/or modify
  23 + * it under the terms of the GNU General Public License version 2 as
  24 + * published by the Free Software Foundation.
  25 + */
  26 +
  27 +#ifndef __ASM_ARCH_MXC_BUSFREQ_H__
  28 +#define __ASM_ARCH_MXC_BUSFREQ_H__
  29 +
  30 +#include <linux/notifier.h>
  31 +#include <linux/regulator/consumer.h>
  32 +
  33 +/*
  34 + * This enumerates busfreq low power mode entry and exit.
  35 + */
  36 +enum busfreq_event {
  37 +       LOW_BUSFREQ_ENTER,
  38 +       LOW_BUSFREQ_EXIT,
  39 +};
  40 +
  41 +/*
  42 + * This enumerates the system bus and ddr frequencies in various modes.
  43 + * BUS_FREQ_HIGH - DDR @ 528MHz, AHB @ 132MHz.
  44 + * BUS_FREQ_MED - DDR @ 400MHz, AHB @ 132MHz
  45 + * BUS_FREQ_AUDIO - DDR @ 50MHz/100MHz, AHB @ 24MHz.
  46 + * BUS_FREQ_LOW  - DDR @ 24MHz, AHB @ 24MHz.
  47 + * BUS_FREQ_ULTRA_LOW - DDR @ 1MHz, AHB - 3MHz.
  48 + *
  49 + * Drivers need to request/release the bus/ddr frequencies based on
  50 + * their performance requirements. Drivers cannot request/release
  51 + * BUS_FREQ_ULTRA_LOW mode as this mode is automatically entered from
  52 + * either BUS_FREQ_AUDIO or BUS_FREQ_LOW
  53 + * modes.
  54 + */
  55 +enum bus_freq_mode {
  56 +       BUS_FREQ_HIGH,
  57 +       BUS_FREQ_MED,
  58 +       BUS_FREQ_AUDIO,
  59 +       BUS_FREQ_LOW,
  60 +       BUS_FREQ_ULTRA_LOW,
  61 +};
  62 +
  63 +#if defined(CONFIG_HAVE_IMX_BUSFREQ) && !defined(CONFIG_ARM64)
  64 +extern struct regulator *arm_reg;
  65 +extern struct regulator *soc_reg;
  66 +void request_bus_freq(enum bus_freq_mode mode);
  67 +void release_bus_freq(enum bus_freq_mode mode);
  68 +int register_busfreq_notifier(struct notifier_block *nb);
  69 +int unregister_busfreq_notifier(struct notifier_block *nb);
  70 +int get_bus_freq_mode(void);
  71 +#elif defined(CONFIG_HAVE_IMX_BUSFREQ)
  72 +void request_bus_freq(enum bus_freq_mode mode);
  73 +void release_bus_freq(enum bus_freq_mode mode);
  74 +int get_bus_freq_mode(void);
  75 +#else
  76 +static inline void request_bus_freq(enum bus_freq_mode mode)
  77 +{
  78 +}
  79 +static inline void release_bus_freq(enum bus_freq_mode mode)
  80 +{
  81 +}
  82 +static inline int register_busfreq_notifier(struct notifier_block *nb)
  83 +{
  84 +       return 0;
  85 +}
  86 +static inline int unregister_busfreq_notifier(struct notifier_block *nb)
  87 +{
  88 +       return 0;
  89 +}
  90 +static inline int get_bus_freq_mode(void)
  91 +{
  92 +       return BUS_FREQ_HIGH;
  93 +}
  94 +#endif
  95 +#endif