target/linux/layerscape/patches-4.4/7191-staging-fsl-mc-bus-rescan-attribute-to-sync-kernel-w.patch

   1 From 417d71b1e291725c01893bf1553478924d05952f Mon Sep 17 00:00:00 2001
   2 From: Lijun Pan <Lijun.Pan@freescale.com>
   3 Date: Mon, 8 Feb 2016 17:40:16 -0600
   4 Subject: [PATCH 191/226] staging: fsl-mc: bus rescan attribute to sync kernel
   5  with MC
   6
   7 Introduce the rescan attribute as a bus attribute to
   8 synchronize the fsl-mc bus objects and the MC firmware.
   9
  10 To rescan the fsl-mc bus, e.g.,
  11 echo 1 > /sys/bus/fsl-mc/rescan
  12
  13 Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
  14 ---
  15  drivers/staging/fsl-mc/bus/mc-bus.c |   47 +++++++++++++++++++++++++++++++++++
  16  1 file changed, 47 insertions(+)
  17
  18 --- a/drivers/staging/fsl-mc/bus/mc-bus.c
  19 +++ b/drivers/staging/fsl-mc/bus/mc-bus.c
  20 @@ -139,11 +139,58 @@ static const struct attribute_group *fsl
  21         NULL,
  22  };
  23
  24 +static int scan_fsl_mc_bus(struct device *dev, void *data)
  25 +{
  26 +       unsigned int irq_count;
  27 +       struct fsl_mc_device *root_mc_dev;
  28 +       struct fsl_mc_bus *root_mc_bus;
  29 +
  30 +       if (fsl_mc_is_root_dprc(dev)) {
  31 +               root_mc_dev = to_fsl_mc_device(dev);
  32 +               root_mc_bus = to_fsl_mc_bus(root_mc_dev);
  33 +               mutex_lock(&root_mc_bus->scan_mutex);
  34 +               dprc_scan_objects(root_mc_dev, &irq_count);
  35 +               mutex_unlock(&root_mc_bus->scan_mutex);
  36 +       }
  37 +
  38 +       return 0;
  39 +}
  40 +
  41 +static ssize_t bus_rescan_store(struct bus_type *bus,
  42 +                               const char *buf, size_t count)
  43 +{
  44 +       unsigned long val;
  45 +
  46 +       if (kstrtoul(buf, 0, &val) < 0)
  47 +               return -EINVAL;
  48 +
  49 +       if (val)
  50 +               bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
  51 +
  52 +       return count;
  53 +}
  54 +static BUS_ATTR(rescan, (S_IWUSR | S_IWGRP), NULL, bus_rescan_store);
  55 +
  56 +static struct attribute *fsl_mc_bus_attrs[] = {
  57 +       &bus_attr_rescan.attr,
  58 +       NULL,
  59 +};
  60 +
  61 +static const struct attribute_group fsl_mc_bus_group = {
  62 +       .attrs = fsl_mc_bus_attrs,
  63 +};
  64 +
  65 +static const struct attribute_group *fsl_mc_bus_groups[] = {
  66 +       &fsl_mc_bus_group,
  67 +       NULL,
  68 +};
  69 +
  70  struct bus_type fsl_mc_bus_type = {
  71         .name = "fsl-mc",
  72         .match = fsl_mc_bus_match,
  73         .uevent = fsl_mc_bus_uevent,
  74         .dev_groups = fsl_mc_dev_groups,
  75 +       .bus_groups = fsl_mc_bus_groups,
  76  };
  77  EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
  78