linux-kernel - Re: [PATCH v6 6/6] PCI: uniphier: Add error message when failed to get phy

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Message-ID: <CAL_JsqJhvpiAWfa7w4-85-GObkW+pq6PUpZUGg8Sc5p4+qsuQA@mail.gmail.com>
Date:   Mon, 17 Aug 2020 10:39:43 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Marc Zyngier <maz@...nel.org>, PCI <linux-pci@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH v6 6/6] PCI: uniphier: Add error message when failed to
 get phy

On Fri, Aug 7, 2020 at 4:25 AM Kunihiko Hayashi
<hayashi.kunihiko@...ionext.com> wrote:
>
> Even if phy driver doesn't probe, the error message can't be distinguished
> from other errors. This displays error message caused by the phy driver
> explicitly.
>
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> ---
>  drivers/pci/controller/dwc/pcie-uniphier.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
> index 93ef608..7c8721e 100644
> --- a/drivers/pci/controller/dwc/pcie-uniphier.c
> +++ b/drivers/pci/controller/dwc/pcie-uniphier.c
> @@ -489,8 +489,12 @@ static int uniphier_pcie_probe(struct platform_device *pdev)
>                 return PTR_ERR(priv->rst);
>
>         priv->phy = devm_phy_optional_get(dev, "pcie-phy");

The point of the optional variant vs. devm_phy_get() is whether or not
you get an error message. So shouldn't you switch to devm_phy_get
instead?

> -       if (IS_ERR(priv->phy))
> -               return PTR_ERR(priv->phy);
> +       if (IS_ERR(priv->phy)) {
> +               ret = PTR_ERR(priv->phy);
> +               if (ret != -EPROBE_DEFER)
> +                       dev_err(dev, "Failed to get phy (%d)\n", ret);
> +               return ret;
> +       }
>
>         platform_set_drvdata(pdev, priv);
>
> --
> 2.7.4
>