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interconnect: Allow inter-provider pairs to be configured 

This patch adds support for a new boolean 'inter_set' field in struct
icc_provider. Setting it to 'true' enables calling '->set' for
inter-provider node pairs. All existing users of the interconnect
framework allocate this structure with kzalloc, and are therefore
unaffected by this change.

This makes it easier for hierarchies like exynos-bus, where every bus
is probed separately and registers a separate interconnect provider, to
model constraints between buses.

Signed-off-by: Artur Świgoń <a.swigon@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200521122841.8867-4-s.nawrocki@samsung.com
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
This commit is contained in:
Artur Świgoń 2020-05-21 14:28:41 +02:00 committed by Georgi Djakov
parent 0259a41da3
commit 65461e26b1
2 changed files with 7 additions and 6 deletions
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11
drivers/interconnect/core.c
View File

@ -263,23 +263,22 @@ static int aggregate_requests(struct icc_node *node)
static int apply_constraints(struct icc_path *path)
{
struct icc_node *next, *prev = NULL;
struct icc_provider *p;
int ret = -EINVAL;
int i;
for (i = 0; i < path->num_nodes; i++) {
next = path->reqs[i].node;
p = next->provider;
/*
* Both endpoints should be valid master-slave pairs of the
* same interconnect provider that will be configured.
*/
if (!prev || next->provider != prev->provider) {
/* both endpoints should be valid master-slave pairs */
if (!prev || (p != prev->provider && !p->inter_set)) {
prev = next;
continue;
}
/* set the constraints */
ret = next->provider->set(prev, next);
ret = p->set(prev, next);
if (ret)
goto out;

2
include/linux/interconnect-provider.h
View File

@ -41,6 +41,7 @@ struct icc_node *of_icc_xlate_onecell(struct of_phandle_args *spec,
* @xlate: provider-specific callback for mapping nodes from phandle arguments
* @dev: the device this interconnect provider belongs to
* @users: count of active users
* @inter_set: whether inter-provider pairs will be configured with @set
* @data: pointer to private data
*/
struct icc_provider {
@ -53,6 +54,7 @@ struct icc_provider {
struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
struct device *dev;
int users;
bool inter_set;
void *data;
};