From: Anand Moon <linux.amoon@gmail.com>
To: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Krzysztof Kozlowski <krzk@kernel.org>,
Alim Akhtar <alim.akhtar@samsung.com>,
linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] PM / devfreq: exynos: Use Use devm_clk_get_enabled() helpers
Date: Fri, 10 May 2024 14:09:03 +0530 [thread overview]
Message-ID: <CANAwSgQ+OxcYyqX5hSvmdD=V3WdTqDdG3XDbcH02gRKmzkHNyw@mail.gmail.com> (raw)
In-Reply-To: <d2943958-ac80-4158-8e7c-b5493ab713f8@wanadoo.fr>
Hi Christophe,
On Fri, 10 May 2024 at 01:35, Christophe JAILLET
<christophe.jaillet@wanadoo.fr> wrote:
>
> Le 09/05/2024 à 08:47, Anand Moon a écrit :
> > The devm_clk_get_enabled() helpers:
> > - call devm_clk_get()
> > - call clk_prepare_enable() and register what is needed in order to
> > call clk_disable_unprepare() when needed, as a managed resource.
> >
> > This simplifies the code and avoids the calls to clk_disable_unprepare().
> >
> > While at it, use dev_err_probe consistently, and use its return value
> > to return the error code.
> >
> > Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> > ---
> > V4 - wrap up the error messagee within 80 char
> > v3 - No change
> > v2 - No change
> > ---
> > drivers/devfreq/exynos-bus.c | 22 +++++-----------------
> > 1 file changed, 5 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> > index 00118580905a..7d06c476d8e9 100644
> > --- a/drivers/devfreq/exynos-bus.c
> > +++ b/drivers/devfreq/exynos-bus.c
> > @@ -160,7 +160,6 @@ static void exynos_bus_exit(struct device *dev)
> > platform_device_unregister(bus->icc_pdev);
> >
> > dev_pm_opp_of_remove_table(dev);
> > - clk_disable_unprepare(bus->clk);
> > dev_pm_opp_put_regulators(bus->opp_token);
> > }
> >
> > @@ -171,7 +170,6 @@ static void exynos_bus_passive_exit(struct device *dev)
> > platform_device_unregister(bus->icc_pdev);
> >
> > dev_pm_opp_of_remove_table(dev);
> > - clk_disable_unprepare(bus->clk);
> > }
> >
> > static int exynos_bus_parent_parse_of(struct device_node *np,
> > @@ -247,23 +245,16 @@ static int exynos_bus_parse_of(struct device_node *np,
> > int ret;
> >
> > /* Get the clock to provide each bus with source clock */
> > - bus->clk = devm_clk_get(dev, "bus");
> > - if (IS_ERR(bus->clk)) {
> > - dev_err(dev, "failed to get bus clock\n");
> > - return PTR_ERR(bus->clk);
> > - }
> > -
> > - ret = clk_prepare_enable(bus->clk);
> > - if (ret < 0) {
> > - dev_err(dev, "failed to get enable clock\n");
> > - return ret;
> > - }
> > + bus->clk = devm_clk_get_enabled(dev, "bus");
> > + if (IS_ERR(bus->clk))
> > + return dev_err_probe(dev, PTR_ERR(bus->clk),
> > + "failed to get bus clock\n");
> >
> > /* Get the freq and voltage from the OPP table to scale the bus freq */
> > ret = dev_pm_opp_of_add_table(dev);
> > if (ret < 0) {
> > dev_err(dev, "failed to get OPP table\n");
> > - goto err_clk;
> > + return ret;
> > }
> >
> > rate = clk_get_rate(bus->clk);
> > @@ -281,8 +272,6 @@ static int exynos_bus_parse_of(struct device_node *np,
> >
> > err_opp:
> > dev_pm_opp_of_remove_table(dev);
> > -err_clk:
> > - clk_disable_unprepare(bus->clk);
> >
> > return ret;
> > }
> > @@ -453,7 +442,6 @@ static int exynos_bus_probe(struct platform_device *pdev)
> >
> > err:
> > dev_pm_opp_of_remove_table(dev);
> > - clk_disable_unprepare(bus->clk);
> > err_reg:
> > dev_pm_opp_put_regulators(bus->opp_token);
> >
>
> Hi,
>
> If the patch is correct, I think that clk in struct exynos_bus can be
> easily be removed as well.
>
Yes, you are correct, I will submit a patch following these changes.
> CJ
Thanks
-Anand
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prev parent reply other threads:[~2024-05-10 8:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 6:47 [PATCH v4] PM / devfreq: exynos: Use Use devm_clk_get_enabled() helpers Anand Moon
2024-05-09 20:04 ` Christophe JAILLET
2024-05-10 8:39 ` Anand Moon [this message]
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