linux-kernel - Re: [PATCH v1 21/30] usb: host: ehci-tegra: Support OPP and SoC core voltage scaling

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Message-ID: <cbc6bf1f-eccb-dee5-d2aa-2c60f1d365e2@gmail.com>
Date:   Thu, 5 Nov 2020 20:54:48 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        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 21/30] usb: host: ehci-tegra: Support OPP and SoC core
 voltage scaling

05.11.2020 19:07, Alan Stern пишет:
> Do you really want to use the same error unwinding for opp_table values 
> obtained from dev_pm_opp_set_regulators() as from 
> dev_pm_opp_get_opp_table()?

They both are pointing at the same opp_table, which is refcounted.

The dev_pm_opp_set_regulators() is dev_pm_opp_get_opp_table() + it sets
regulator for the table.

https://elixir.bootlin.com/linux/v5.10-rc2/source/drivers/opp/core.c#L1756