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Revert "of/platform: Add functional dependency link from DT bindings"

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This reverts commit 690ff7881b.

Based on a lot of email and in-person discussions, this patch series is
being reworked to address a number of issues that were pointed out that
needed to be taken care of before it should be merged.  It will be
resubmitted with those changes hopefully soon.

Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-08-27 21:40:58 +02:00
parent bcca686c11
commit d77b3f07a1
2 changed files with 0 additions and 170 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3170,11 +3170,6 @@
This can be set from sysctl after boot.
See Documentation/admin-guide/sysctl/vm.rst for details.
of_devlink [KNL] Make device links from common DT bindings. Useful
for optimizing probe order and making sure resources
aren't turned off before the consumer devices have
probed.
ohci1394_dma=early [HW] enable debugging via the ohci1394 driver.
See Documentation/debugging-via-ohci1394.txt for more
info.

165
drivers/of/platform.c
View File

@ -503,170 +503,6 @@ int of_platform_default_populate(struct device_node *root,
}
EXPORT_SYMBOL_GPL(of_platform_default_populate);
bool of_link_is_valid(struct device_node *con, struct device_node *sup)
{
of_node_get(sup);
/*
* Don't allow linking a device node as a consumer of one of its
* descendant nodes. By definition, a child node can't be a functional
* dependency for the parent node.
*/
while (sup) {
if (sup == con) {
of_node_put(sup);
return false;
}
sup = of_get_next_parent(sup);
}
return true;
}
static int of_link_to_phandle(struct device *dev, struct device_node *sup_np)
{
struct platform_device *sup_dev;
u32 dl_flags = DL_FLAG_AUTOPROBE_CONSUMER;
int ret = 0;
/*
* Since we are trying to create device links, we need to find
* the actual device node that owns this supplier phandle.
* Often times it's the same node, but sometimes it can be one
* of the parents. So walk up the parent till you find a
* device.
*/
while (sup_np && !of_find_property(sup_np, "compatible", NULL))
sup_np = of_get_next_parent(sup_np);
if (!sup_np)
return 0;
if (!of_link_is_valid(dev->of_node, sup_np)) {
of_node_put(sup_np);
return 0;
}
sup_dev = of_find_device_by_node(sup_np);
of_node_put(sup_np);
if (!sup_dev)
return -ENODEV;
if (!device_link_add(dev, &sup_dev->dev, dl_flags))
ret = -ENODEV;
put_device(&sup_dev->dev);
return ret;
}
static struct device_node *parse_prop_cells(struct device_node *np,
const char *prop, int index,
const char *binding,
const char *cell)
{
struct of_phandle_args sup_args;
/* Don't need to check property name for every index. */
if (!index && strcmp(prop, binding))
return NULL;
if (of_parse_phandle_with_args(np, binding, cell, index, &sup_args))
return NULL;
return sup_args.np;
}
static struct device_node *parse_clocks(struct device_node *np,
const char *prop, int index)
{
return parse_prop_cells(np, prop, index, "clocks", "#clock-cells");
}
static struct device_node *parse_interconnects(struct device_node *np,
const char *prop, int index)
{
return parse_prop_cells(np, prop, index, "interconnects",
"#interconnect-cells");
}
static int strcmp_suffix(const char *str, const char *suffix)
{
unsigned int len, suffix_len;
len = strlen(str);
suffix_len = strlen(suffix);
if (len <= suffix_len)
return -1;
return strcmp(str + len - suffix_len, suffix);
}
static struct device_node *parse_regulators(struct device_node *np,
const char *prop, int index)
{
if (index || strcmp_suffix(prop, "-supply"))
return NULL;
return of_parse_phandle(np, prop, 0);
}
/**
* struct supplier_bindings - Information for parsing supplier DT binding
*
* @parse_prop: If the function cannot parse the property, return NULL.
* Otherwise, return the phandle listed in the property
* that corresponds to the index.
*/
struct supplier_bindings {
struct device_node *(*parse_prop)(struct device_node *np,
const char *name, int index);
};
static const struct supplier_bindings bindings[] = {
{ .parse_prop = parse_clocks, },
{ .parse_prop = parse_interconnects, },
{ .parse_prop = parse_regulators, },
{ },
};
static bool of_link_property(struct device *dev, struct device_node *con_np,
const char *prop)
{
struct device_node *phandle;
const struct supplier_bindings *s = bindings;
unsigned int i = 0;
bool done = true, matched = false;
while (!matched && s->parse_prop) {
while ((phandle = s->parse_prop(con_np, prop, i))) {
matched = true;
i++;
if (of_link_to_phandle(dev, phandle))
/*
* Don't stop at the first failure. See
* Documentation for bus_type.add_links for
* more details.
*/
done = false;
}
s++;
}
return done ? 0 : -ENODEV;
}
static bool of_devlink;
core_param(of_devlink, of_devlink, bool, 0);
static int of_link_to_suppliers(struct device *dev)
{
struct property *p;
bool done = true;
if (!of_devlink)
return 0;
if (unlikely(!dev->of_node))
return 0;
for_each_property_of_node(dev->of_node, p)
if (of_link_property(dev, dev->of_node, p->name))
done = false;
return done ? 0 : -ENODEV;
}
#ifndef CONFIG_PPC
static const struct of_device_id reserved_mem_matches[] = {
{ .compatible = "qcom,rmtfs-mem" },
@ -682,7 +518,6 @@ static int __init of_platform_default_populate_init(void)
if (!of_have_populated_dt())
return -ENODEV;
platform_bus_type.add_links = of_link_to_suppliers;
/*
* Handle certain compatibles explicitly, since we don't want to create
* platform_devices for every node in /reserved-memory with a