soc: qcom: rpmhpd: Mark mx as a parent for cx

Specify the active + sleep and active-only MX power domains as
the parents of the corresponding CX power domains. This will ensure that
performance state requests on CX automatically generate equivalent requests
on MX power domains.

This is used to enforce a requirement that exists for various
hardware blocks on SDM845 that MX performance state >= CX performance
state for a given operating frequency.

Acked-by: Viresh Kumar <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
Reviewed-by: Ulf Hansson <[email protected]>
Signed-off-by: Rajendra Nayak <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Signed-off-by: Andy Gross <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
index d3f819c1a90c..5741ec3fa814 100644
--- a/drivers/soc/qcom/rpmhpd.c
+++ b/drivers/soc/qcom/rpmhpd.c
@@ -101,12 +101,14 @@ static struct rpmhpd sdm845_cx_ao;
 static struct rpmhpd sdm845_cx = {
 	.pd = { .name = "cx", },
 	.peer = &sdm845_cx_ao,
+	.parent = &sdm845_mx.pd,
 	.res_name = "cx.lvl",
 };
 
 static struct rpmhpd sdm845_cx_ao = {
 	.pd = { .name = "cx_ao", },
 	.peer = &sdm845_cx,
+	.parent = &sdm845_mx_ao.pd,
 	.res_name = "cx.lvl",
 };
 
@@ -376,6 +378,15 @@ static int rpmhpd_probe(struct platform_device *pdev)
 		data->domains[i] = &rpmhpds[i]->pd;
 	}
 
+	/* Add subdomains */
+	for (i = 0; i < num_pds; i++) {
+		if (!rpmhpds[i])
+			continue;
+		if (rpmhpds[i]->parent)
+			pm_genpd_add_subdomain(rpmhpds[i]->parent,
+					       &rpmhpds[i]->pd);
+	}
+
 	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 }