linux-kernel - [PATCH v1 1/1] devfreq: tegra30-devfreq: add support for Tegra114

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Message-ID: <20260126185423.77786-2-clamor95@gmail.com>
Date: Mon, 26 Jan 2026 20:54:23 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Dmitry Osipenko <digetx@...il.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Svyatoslav Ryhel <clamor95@...il.com>
Cc: linux-pm@...r.kernel.org,
	linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/1] devfreq: tegra30-devfreq: add support for Tegra114

Lets add Tegra114 support to activity monitor device as a preparation to
upcoming EMC controller support.

Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/devfreq/tegra30-devfreq.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index 8ea5b482bfb3..fa83480a923f 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -963,16 +963,22 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
 	return 0;
 }
 
+/*
+ * The activity counter is incremented every 256 memory transactions. However,
+ * the number of clock cycles required for each transaction varies across
+ * different SoC generations. For instance, a single transaction takes 2 EMC
+ * clocks on Tegra30, 1 EMC clock on Tegra114, and 4 EMC clocks on Tegra124.
+ */
 static const struct tegra_devfreq_soc_data tegra124_soc = {
 	.configs = tegra124_device_configs,
-
-	/*
-	 * Activity counter is incremented every 256 memory transactions,
-	 * and each transaction takes 4 EMC clocks.
-	 */
 	.count_weight = 4 * 256,
 };
 
+static const struct tegra_devfreq_soc_data tegra114_soc = {
+	.configs = tegra124_device_configs,
+	.count_weight = 256,
+};
+
 static const struct tegra_devfreq_soc_data tegra30_soc = {
 	.configs = tegra30_device_configs,
 	.count_weight = 2 * 256,
@@ -980,6 +986,7 @@ static const struct tegra_devfreq_soc_data tegra30_soc = {
 
 static const struct of_device_id tegra_devfreq_of_match[] = {
 	{ .compatible = "nvidia,tegra30-actmon",  .data = &tegra30_soc, },
+	{ .compatible = "nvidia,tegra114-actmon", .data = &tegra114_soc, },
 	{ .compatible = "nvidia,tegra124-actmon", .data = &tegra124_soc, },
 	{ },
 };
-- 
2.51.0