[PATCH v3 3/7] interconnect: qcom: Implement xlate_extended() to parse tags

[Georgi Djakov <georgi.djakov@xxxxxxxxxx>]

Implement a function to parse the arguments of the "interconnects" DT
property and populate the interconnect path tags if this information
is available.

Tested-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Reviewed-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
---
 drivers/interconnect/qcom/icc-rpmh.c | 27 +++++++++++++++++++++++++++
 drivers/interconnect/qcom/icc-rpmh.h |  1 +
 2 files changed, 28 insertions(+)

diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
index 3ac5182c9ab2..7e538155e486 100644
--- a/drivers/interconnect/qcom/icc-rpmh.c
+++ b/drivers/interconnect/qcom/icc-rpmh.c
@@ -6,6 +6,8 @@
 #include <linux/interconnect.h>
 #include <linux/interconnect-provider.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
 
 #include "bcm-voter.h"
 #include "icc-rpmh.h"
@@ -92,6 +94,31 @@ int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
 }
 EXPORT_SYMBOL_GPL(qcom_icc_set);
 
+struct icc_node_data *qcom_icc_xlate_extended(struct of_phandle_args *spec, void *data)
+{
+	struct icc_node_data *ndata;
+	struct icc_node *node;
+
+	node = of_icc_xlate_onecell(spec, data);
+	if (IS_ERR(node))
+		return ERR_CAST(node);
+
+	ndata = kzalloc(sizeof(*ndata), GFP_KERNEL);
+	if (!ndata)
+		return ERR_PTR(-ENOMEM);
+
+	ndata->node = node;
+
+	if (spec->args_count == 2)
+		ndata->tag = spec->args[1];
+
+	if (spec->args_count > 2)
+		pr_warn("%pOF: Too many arguments, path tag is not parsed\n", spec->np);
+
+	return ndata;
+}
+EXPORT_SYMBOL_GPL(qcom_icc_xlate_extended);
+
 /**
  * qcom_icc_bcm_init - populates bcm aux data and connect qnodes
  * @bcm: bcm to be initialized
diff --git a/drivers/interconnect/qcom/icc-rpmh.h b/drivers/interconnect/qcom/icc-rpmh.h
index 903d25e61984..1dac39bc255d 100644
--- a/drivers/interconnect/qcom/icc-rpmh.h
+++ b/drivers/interconnect/qcom/icc-rpmh.h
@@ -143,6 +143,7 @@ struct qcom_icc_desc {
 int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 		       u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
 int qcom_icc_set(struct icc_node *src, struct icc_node *dst);
+struct icc_node_data *qcom_icc_xlate_extended(struct of_phandle_args *spec, void *data);
 int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev);
 void qcom_icc_pre_aggregate(struct icc_node *node);