[PATCH 2/4] interconnect: Add get_bw() callback

[Georgi Djakov]

The interconnect controller hardware may support querying the current
bandwidth settings, so add a callback for providers to implement this
functionality if supported.

Signed-off-by: Georgi Djakov <georgi.dja...@linaro.org>
---
 drivers/interconnect/core.c           | 3 ++-
 include/linux/interconnect-provider.h | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index e53adfee1ee3..edbfe8380e83 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -926,7 +926,8 @@ void icc_node_add(struct icc_node *node, struct 
icc_provider *provider)
        list_add_tail(&node->node_list, &provider->nodes);
 
        /* get the bandwidth value and sync it with the hardware */
-       if (node->init_bw && provider->set) {
+       if (provider->get_bw && provider->set) {
+               provider->get_bw(node, &node->init_bw);
                node->peak_bw = node->init_bw;
                provider->set(node, node);
        }
diff --git a/include/linux/interconnect-provider.h 
b/include/linux/interconnect-provider.h
index 153fb7616f96..329eccb19f58 100644
--- a/include/linux/interconnect-provider.h
+++ b/include/linux/interconnect-provider.h
@@ -38,6 +38,7 @@ struct icc_node *of_icc_xlate_onecell(struct of_phandle_args 
*spec,
  * @aggregate: pointer to device specific aggregate operation function
  * @pre_aggregate: pointer to device specific function that is called
  *                before the aggregation begins (optional)
+ * @get_bw: pointer to device specific function to get current bandwidth
  * @xlate: provider-specific callback for mapping nodes from phandle arguments
  * @dev: the device this interconnect provider belongs to
  * @users: count of active users
@@ -50,6 +51,7 @@ struct icc_provider {
        int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
                         u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
        void (*pre_aggregate)(struct icc_node *node);
+       int (*get_bw)(struct icc_node *node, u32 *bw);
        struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
        struct device           *dev;
        int                     users;