linux-kernel - Re: [PATCH v1 18/30] pwm: tegra: Support OPP and core voltage scaling

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Message-ID: <a3bf156d-17b8-0edd-9981-a17991266e1d@gmail.com>
Date:   Wed, 11 Nov 2020 00:17:04 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Peter Chen <Peter.Chen@....com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        linux-samsung-soc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-usb@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v1 18/30] pwm: tegra: Support OPP and core voltage scaling

10.11.2020 23:50, Thierry Reding пишет:
> On Thu, Nov 05, 2020 at 02:44:15AM +0300, Dmitry Osipenko wrote:
> [...]
>> +static void tegra_pwm_deinit_opp_table(void *data)
>> +{
>> +	struct device *dev = data;
>> +	struct opp_table *opp_table;
>> +
>> +	opp_table = dev_pm_opp_get_opp_table(dev);
>> +	dev_pm_opp_of_remove_table(dev);
>> +	dev_pm_opp_put_regulators(opp_table);
>> +	dev_pm_opp_put_opp_table(opp_table);
>> +}
>> +
>> +static int devm_tegra_pwm_init_opp_table(struct device *dev)
>> +{
>> +	struct opp_table *opp_table;
>> +	const char *rname = "core";
>> +	int err;
>> +
>> +	/* voltage scaling is optional */
>> +	if (device_property_present(dev, "core-supply"))
>> +		opp_table = dev_pm_opp_set_regulators(dev, &rname, 1);
>> +	else
>> +		opp_table = dev_pm_opp_get_opp_table(dev);
>> +
>> +	if (IS_ERR(opp_table))
>> +		return dev_err_probe(dev, PTR_ERR(opp_table),
>> +				     "failed to prepare OPP table\n");
>> +
>> +	/*
>> +	 * OPP table presence is optional and we want the set_rate() of OPP
>> +	 * API to work similarly to clk_set_rate() if table is missing in a
>> +	 * device-tree.  The add_table() errors out if OPP is missing in DT.
>> +	 */
>> +	if (device_property_present(dev, "operating-points-v2")) {
>> +		err = dev_pm_opp_of_add_table(dev);
>> +		if (err) {
>> +			dev_err(dev, "failed to add OPP table: %d\n", err);
>> +			goto put_table;
>> +		}
>> +	}
>> +
>> +	err = devm_add_action(dev, tegra_pwm_deinit_opp_table, dev);
>> +	if (err)
>> +		goto remove_table;
>> +
>> +	return 0;
>> +
>> +remove_table:
>> +	dev_pm_opp_of_remove_table(dev);
>> +put_table:
>> +	dev_pm_opp_put_regulators(opp_table);
>> +
>> +	return err;
>> +}
> 
> These two functions seem to be heavily boilerplate across all these
> drivers. Have you considered splitting these out into separate helpers?

The helper is already prepared for v2.