linux-kernel - Re: [PATCH v6] memory: tegra210: Support interconnect framework

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Message-ID: <865037d1-c89f-4142-a66f-3283c17bf533@kernel.org>
Date: Fri, 31 Oct 2025 14:19:17 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: webgeek1234@...il.com, Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>
Cc: linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v6] memory: tegra210: Support interconnect framework

On 27/10/2025 18:48, Aaron Kling via B4 Relay wrote:
> +
> +	err = dev_pm_opp_of_add_table(emc->dev);
> +	if (err) {
> +		if (err == -ENODEV)
> +			dev_err_probe(emc->dev, err,
> +				      "OPP table not found, please update your device tree\n");
> +		else
> +			dev_err_probe(emc->dev, err, "failed to add OPP table\n");
> +
> +		goto put_hw_table;
> +	}
> +
> +	max_opps = dev_pm_opp_get_opp_count(emc->dev);
> +	if (max_opps <= 0) {
> +		dev_err_probe(emc->dev, err, "Failed to add OPPs\n");
> +		goto remove_table;
> +	}
> +
> +	if (emc->num_timings != max_opps) {
> +		dev_err_probe(emc->dev, err, "OPP table does not match emc table\n");
> +		goto remove_table;
> +	}
> +
> +	for (i = 0; i < emc->num_timings; i++) {
> +		rate = emc->timings[i].rate * 1000;
> +		opp = dev_pm_opp_find_freq_exact(emc->dev, rate, true);
> +		if (IS_ERR(opp)) {
> +			dev_err_probe(emc->dev, err, "Rate %lu not found in OPP table\n", rate);
> +			goto remove_table;
> +		}
> +
> +		dev_pm_opp_put(opp);
> +	}
> +
> +	dev_info_once(emc->dev, "OPP HW ver. 0x%x, current clock rate %lu MHz\n",
> +		      hw_version, clk_get_rate(emc->clk) / 1000000);
> +
> +	return 0;
> +
> +remove_table:
> +	dev_pm_opp_of_remove_table(emc->dev);
> +put_hw_table:
> +	dev_pm_opp_put_supported_hw(opp_token);
> +
> +	return err;
> +}
> +
>  static void tegra210_emc_detect(struct tegra210_emc *emc)
>  {
>  	u32 value;
> @@ -1966,6 +2222,14 @@ static int tegra210_emc_probe(struct platform_device *pdev)
>  
>  	tegra210_emc_debugfs_init(emc);
>  
> +	err = tegra210_emc_opp_table_init(emc);
> +	if (!err) {
> +		tegra210_emc_rate_requests_init(emc);
> +		tegra210_emc_interconnect_init(emc);

This looks like new ABI or did I miss something and it is already
documented? If so please always mention in the changelog that bindings
are already merged to master tree.

Same question for earlier PM OPP.


> +	} else if (err != -ENODEV) {
> +		return err;
> +	}
> +
>  	cd = devm_thermal_of_cooling_device_register(emc->dev, np, "emc", emc,
>  				

Best regards,
Krzysztof