linux-kernel - [PATCH 5.16 123/285] opp: Expose of-nodes name in debugfs

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Date:   Tue, 12 Apr 2022 08:29:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Leo Yan <leo.yan@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 123/285] opp: Expose of-nodes name in debugfs

From: Viresh Kumar <viresh.kumar@...aro.org>

[ Upstream commit 021dbecabc93b1610b5db989d52a94e0c6671136 ]

It is difficult to find which OPPs are active at the moment, specially
if there are multiple OPPs with same frequency available in the device
tree (controlled by supported hardware feature).

Expose name of the DT node to find out the exact OPP.

While at it, also expose level field.

Reported-by: Leo Yan <leo.yan@...aro.org>
Tested-by: Leo Yan <leo.yan@...aro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/opp/debugfs.c | 5 +++++
 drivers/opp/opp.h     | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index 596c185b5dda..b5f2f9f39392 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -10,6 +10,7 @@
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/of.h>
 #include <linux/init.h>
 #include <linux/limits.h>
 #include <linux/slab.h>
@@ -131,9 +132,13 @@ void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
 	debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
 	debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);
 	debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate);
+	debugfs_create_u32("level", S_IRUGO, d, &opp->level);
 	debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
 			     &opp->clock_latency_ns);
 
+	opp->of_name = of_node_full_name(opp->np);
+	debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
+
 	opp_debug_create_supplies(opp, opp_table, d);
 	opp_debug_create_bw(opp, opp_table, d);
 
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 407c3bfe51d9..45e3a55239a1 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -96,6 +96,7 @@ struct dev_pm_opp {
 
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dentry;
+	const char *of_name;
 #endif
 };
 
-- 
2.35.1