linux-kernel - Re: [[PATCH v2 2/2] OPP: Add 'opp-microwatt' parsing for advanced EM registration

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Message-ID: <20220223055357.t3wulpla64vt3xus@vireshk-i7>
Date:   Wed, 23 Feb 2022 11:23:57 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        rafael@...nel.org, daniel.lezcano@...aro.org, nm@...com,
        sboyd@...nel.org, mka@...omium.org, dianders@...omium.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [[PATCH v2 2/2] OPP: Add 'opp-microwatt' parsing for advanced EM
 registration

On 22-02-22, 14:07, Lukasz Luba wrote:
> +static int _of_find_opp_microwatt_property(struct device *dev)
> +{
> +	unsigned long freq = 0;
> +	struct dev_pm_opp *opp;
> +	struct device_node *np;
> +	struct property *prop;
> +
> +	/* We only support "operating-points-v2" */
> +	np = dev_pm_opp_of_get_opp_desc_node(dev);
> +	if (!np)
> +		return -EINVAL;
> +
> +	of_node_put(np);
> +
> +	/* Check if an OPP has needed property */
> +	opp = dev_pm_opp_find_freq_ceil(dev, &freq);
> +	if (IS_ERR(opp))
> +		return -EINVAL;
> +
> +	prop = of_find_property(opp->np, "opp-microwatt", NULL);
> +	dev_pm_opp_put(opp);
> +	if (!prop)
> +		return -EINVAL;
> +
> +	return 0;
> +}

Please follow everything just like opp-microvolt is defined. Create a new field
in the struct dev_pm_opp, initialize it only once when the OPP is created, that
field should be used here instead of parsing the DT here again. There also needs
to be a debug file in debugfs for this new field.

Search for "supply" and "microvolt" in the OPP core, you will see all the places
that need it.

-- 
viresh