linux-kernel - Re: [PATCH v2 1/2] PCI: j721e: Use devm_clk_get_optional

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CANAwSgQ2PH1TJLEBVPFJ-RdaNFxn=eTzRYfEmbjx=EYq_YOeQw@mail.gmail.com>
Date: Sat, 25 Oct 2025 14:07:42 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Siddharth Vadapalli <s-vadapalli@...com>
Cc: Vignesh Raghavendra <vigneshr@...com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kwilczynski@...nel.org>, 
	Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	"open list:PCI DRIVER FOR TI DRA7XX/J721E" <linux-omap@...r.kernel.org>, 
	"open list:PCI DRIVER FOR TI DRA7XX/J721E" <linux-pci@...r.kernel.org>, 
	"moderated list:PCI DRIVER FOR TI DRA7XX/J721E" <linux-arm-kernel@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>, Markus Elfring <Markus.Elfring@....de>, 
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v2 1/2] PCI: j721e: Use devm_clk_get_optional_enabled() to
 get the clock

Hi Siddharth,

Thanks for your review comments,

On Sat, 25 Oct 2025 at 13:20, Siddharth Vadapalli <s-vadapalli@...com> wrote:
>
> On Sat, 2025-10-25 at 13:13 +0530, Anand Moon wrote:
> > Use devm_clk_get_optional_enabled() helper instead of calling
> > devm_clk_get_optional() and then clk_prepare_enable(). It simplifies
> > the clk_prepare_enable() and clk_disable_unprepare() with proper error
> > handling and makes the code more compact.
> > The result of devm_clk_get_optional_enabled() is now assigned directly
> > to pcie->refclk. This removes a superfluous local clk variable,
> > improving code readability and compactness. The functionality
> > remains unchanged, but the code is now more streamlined.
> >
> > Cc: Siddharth Vadapalli <s-vadapalli@...com>
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> > v2: Rephase the commit message and use proper error pointer
> >     PTR_ERR(pcie->refclk) to return error.
> > v1: Drop explicit clk_disable_unprepare as it handled by
> >     devm_clk_get_optional_enabled, Since devm_clk_get_optional_enabled
> >     internally manages clk_prepare_enable and clk_disable_unprepare
> >     as part of its lifecycle, the explicit call to clk_disable_unprepare
> >     is redundant and can be safely removed.
> > ---
> >  drivers/pci/controller/cadence/pci-j721e.c | 21 +++++----------------
> >  1 file changed, 5 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
> > index 5bc5ab20aa6d..b678f7d48206 100644
> > --- a/drivers/pci/controller/cadence/pci-j721e.c
> > +++ b/drivers/pci/controller/cadence/pci-j721e.c
>
> [TRIMMED]
>
> > @@ -692,7 +682,6 @@ static int j721e_pcie_suspend_noirq(struct device *dev)
> >
> >       if (pcie->mode == PCI_MODE_RC) {
> >               gpiod_set_value_cansleep(pcie->reset_gpio, 0);
> > -             clk_disable_unprepare(pcie->refclk);
>
> j721e_pcie_resume_noirq() contains clk_enable_prepare().
Ok I will drop the clk_prepare_enable and clk_disable_unprepare in
this function?
>
> >       }
> >
> >       cdns_pcie_disable_phy(pcie->cdns_pcie);
>
> Regards,
> Siddharth.

Thanks
-Anand