linux-kernel - Re: [PATCH v4 01/12] devfreq: tegra30-devfreq: add support for Tegra114

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Message-ID: <2830254.usQuhbGJ8B@senjougahara>
Date: Tue, 20 Jan 2026 15:56:30 +0900
From: Mikko Perttunen <mperttunen@...dia.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Thierry Reding <treding@...dia.com>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>,
 Prashant Gaikwad <pgaikwad@...dia.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>,
 Dmitry Osipenko <digetx@...il.com>, MyungJoo Ham <myungjoo.ham@...sung.com>,
 Kyungmin Park <kyungmin.park@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>, Svyatoslav Ryhel <clamor95@...il.com>,
 Svyatoslav Ryhel <clamor95@...il.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-tegra@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-pm@...r.kernel.org
Subject:
 Re: [PATCH v4 01/12] devfreq: tegra30-devfreq: add support for Tegra114

On Tuesday, November 25, 2025 9:05 PM Svyatoslav Ryhel wrote:
> Lets add Tegra114 support to activity monitor device as a preparation to
> upcoming EMC controller support.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.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, },
>  	{ },
>  };
> 

Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>