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 <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Tested-by: Dmitry Baryshkov <[e-mail]> #db820c
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Georgi Djakov <[e-mail]>

drivers/interconnect/qcom/icc-rpm.c

···
 #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>
 
···
 	ret = clk_bulk_prepare_enable(qp->num_clks, qp->bus_clks);
 	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);

drivers/interconnect/qcom/icc-rpm.h

···
 	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;