interconnect: icc-rpm: Add support for bus power domain

Add support for attaching to a power domain. This is required
for Aggregate 0 NoC on MSM8996, which is powered by a GDSC.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> #db820c
Link: https://lore.kernel.org/r/20211021132329.234942-3-y.oudjana@protonmail.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>

drivers/interconnect/qcom/icc-rpm.c

@@ -11,6 +11,7 @@
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/pm_domain.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 
@@ -340,6 +341,12 @@ int qnoc_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	if (desc->has_bus_pd) {
+		ret = dev_pm_domain_attach(dev, true);
+		if (ret)
+			return ret;
+	}
+
 	provider = &qp->provider;
 	INIT_LIST_HEAD(&provider->nodes);
 	provider->dev = dev;

drivers/interconnect/qcom/icc-rpm.h

@@ -77,6 +77,7 @@ struct qcom_icc_desc {
 	size_t num_nodes;
 	const char * const *clocks;
 	size_t num_clocks;
+	bool has_bus_pd;
 	bool is_bimc_node;
 	const struct regmap_config *regmap_cfg;
 	unsigned int qos_offset;