recipes/linux/linux-omap-2.6.37/dvfs/0009-OMAP-Introduce-device-specific-set-rate-and-get-rate.patch

   1 From 6ec7cf889c9a8ddf97fbbcbda4888b0f17930e04 Mon Sep 17 00:00:00 2001
   2 From: Thara Gopinath <thara@ti.com>
   3 Date: Fri, 29 Oct 2010 20:43:29 +0530
   4 Subject: [PATCH 09/20] OMAP: Introduce device specific set rate and get rate in omap_device structure
   5
   6 This patch extends the omap_device structure to contain
   7 pointers to scale the operating rate of the
   8 device and to retrieve the operating rate of the device.
   9 This patch also adds the three new APIs in the omap device layer
  10 namely omap_device_set_rate that can be called to set a new operating
  11 rate for a device, omap_device_get_rate that can be called to retrieve
  12 the operating frequency for a device and omap_device_populate_rate_fns
  13 to populte the device specific set_rate and get_rate API's.
  14 The omap_device_set_rate and omap_device_get_rate does some routine error
  15 checks and finally calls into the device specific set_rate
  16 and get_rate APIs populated through omap_device_populate_rate_fns.
  17
  18 Signed-off-by: Thara Gopinath <thara@ti.com>
  19 ---
  20  arch/arm/plat-omap/include/plat/omap_device.h |    9 +++++
  21  arch/arm/plat-omap/omap_device.c              |   49 +++++++++++++++++++++++++
  22  2 files changed, 58 insertions(+), 0 deletions(-)
  23
  24 diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
  25 index e4c349f..1178b86 100644
  26 --- a/arch/arm/plat-omap/include/plat/omap_device.h
  27 +++ b/arch/arm/plat-omap/include/plat/omap_device.h
  28 @@ -50,6 +50,8 @@ extern struct device omap_device_parent;
  29   * @hwmods: (one .. many per omap_device)
  30   * @hwmods_cnt: ARRAY_SIZE() of @hwmods
  31   * @pm_lats: ptr to an omap_device_pm_latency table
  32 + * @set_rate: fn ptr to change the operating rate.
  33 + * @get_rate: fn ptr to retrieve the current operating rate.
  34   * @pm_lats_cnt: ARRAY_SIZE() of what is passed to @pm_lats
  35   * @pm_lat_level: array index of the last odpl entry executed - -1 if never
  36   * @dev_wakeup_lat: dev wakeup latency in nanoseconds
  37 @@ -67,6 +69,8 @@ struct omap_device {
  38         struct platform_device          pdev;
  39         struct omap_hwmod               **hwmods;
  40         struct omap_device_pm_latency   *pm_lats;
  41 +       int (*set_rate)(struct device *dev, unsigned long rate);
  42 +       unsigned long (*get_rate) (struct device *dev);
  43         u32                             dev_wakeup_lat;
  44         u32                             _dev_wakeup_lat_limit;
  45         u8                              pm_lats_cnt;
  46 @@ -108,6 +112,11 @@ int omap_device_align_pm_lat(struct platform_device *pdev,
  47                              u32 new_wakeup_lat_limit);
  48  struct powerdomain *omap_device_get_pwrdm(struct omap_device *od);
  49  u32 omap_device_get_context_loss_count(struct platform_device *pdev);
  50 +int omap_device_set_rate(struct device *dev, unsigned long freq);
  51 +unsigned long omap_device_get_rate(struct device *dev);
  52 +void omap_device_populate_rate_fns(struct device *dev,
  53 +               int (*set_rate)(struct device *dev, unsigned long rate),
  54 +               unsigned long (*get_rate) (struct device *dev));
  55
  56  /* Other */
  57
  58 diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
  59 index 2c95e61..0d67af6 100644
  60 --- a/arch/arm/plat-omap/omap_device.c
  61 +++ b/arch/arm/plat-omap/omap_device.c
  62 @@ -813,6 +813,55 @@ int omap_device_enable_clocks(struct omap_device *od)
  63         return 0;
  64  }
  65
  66 +int omap_device_set_rate(struct device *dev, unsigned long freq)
  67 +{
  68 +       struct platform_device *pdev;
  69 +       struct omap_device *od;
  70 +
  71 +       pdev = container_of(dev, struct platform_device, dev);
  72 +       od = _find_by_pdev(pdev);
  73 +
  74 +       if (!od->set_rate) {
  75 +               dev_err(dev, "%s: No set_rate API for scaling device\n",
  76 +                       __func__);
  77 +               return -ENODATA;
  78 +       }
  79 +
  80 +       return od->set_rate(dev, freq);
  81 +}
  82 +
  83 +unsigned long omap_device_get_rate(struct device *dev)
  84 +{
  85 +       struct platform_device *pdev;
  86 +       struct omap_device *od;
  87 +
  88 +       pdev = container_of(dev, struct platform_device, dev);
  89 +       od = _find_by_pdev(pdev);
  90 +
  91 +
  92 +       if (!od->get_rate) {
  93 +               dev_err(dev, "%s: No get rate API for the device\n",
  94 +                       __func__);
  95 +               return 0;
  96 +       }
  97 +
  98 +       return od->get_rate(dev);
  99 +}
 100 +
 101 +void omap_device_populate_rate_fns(struct device *dev,
 102 +               int (*set_rate)(struct device *dev, unsigned long rate),
 103 +               unsigned long (*get_rate) (struct device *dev))
 104 +{
 105 +       struct platform_device *pdev;
 106 +       struct omap_device *od;
 107 +
 108 +       pdev = container_of(dev, struct platform_device, dev);
 109 +       od = _find_by_pdev(pdev);
 110 +
 111 +       od->set_rate = set_rate;
 112 +       od->get_rate = get_rate;
 113 +}
 114 +
 115  struct device omap_device_parent = {
 116         .init_name      = "omap",
 117         .parent         = &platform_bus,
 118 --
 119 1.6.6.1
 120