linux-kernel - Re: [RFC PATCH 2/3] media: platform: Add CRU driver for RZ/G2L SoC

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Date:   Wed, 8 Dec 2021 00:32:46 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media <linux-media@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [RFC PATCH 2/3] media: platform: Add CRU driver for RZ/G2L SoC

Hi Philipp,

Thank you for the review.

On Tue, Dec 7, 2021 at 8:16 AM Philipp Zabel <p.zabel@...gutronix.de> wrote:
>
> On Tue, 2021-12-07 at 01:23 +0000, Lad Prabhakar wrote:
> [...]
> > +static int rzg2l_cru_probe(struct platform_device *pdev)
> > +{
> > +     struct rzg2l_cru_dev *cru;
> > +     struct v4l2_ctrl *ctrl;
> > +     int irq, ret;
> > +
> > +     cru = devm_kzalloc(&pdev->dev, sizeof(*cru), GFP_KERNEL);
> > +     if (!cru)
> > +             return -ENOMEM;
> > +
> > +     cru->dev = &pdev->dev;
> > +     cru->info = of_device_get_match_data(&pdev->dev);
> > +
> > +     cru->base = devm_platform_ioremap_resource(pdev, 0);
> > +     if (IS_ERR(cru->base))
> > +             return PTR_ERR(cru->base);
> > +
> > +     irq = platform_get_irq(pdev, 1);
> > +     if (irq < 0)
> > +             return irq;
> > +
> > +     cru->vclk = clk_get(&pdev->dev, "vclk");
> > +     if (IS_ERR(cru->vclk))
> > +             return PTR_ERR(cru->vclk);
>
> devm_clk_get()?
> Don't mix devm and non-devm functions like this, all devm functions
> should be placed first.
>
Agreed, I will use devm_clk_get().

> > +     cru->cmn_restb = devm_reset_control_get_by_index(&pdev->dev, 0);
>
> Your binding has reset-names defined, please request reset controls by
> name. Use devm_reset_control_get_explicit() instead, same below.
>
> > +     if (IS_ERR(cru->cmn_restb)) {
> > +             dev_err(&pdev->dev, "failed to get cpg cmn_restb\n");
> > +             return PTR_ERR(cru->cmn_restb);
>
> These could return -EPROBE_DEFER, I suggest to
>
>                 return dev_err_probe(&pdev->dev, PTR_ERR(cru->cmn_restb),
>                                      "failed to get cpg cmn_restb\n");
>
OK will do.
> instead, same below.
>
ditto.

Cheers,
Prabhakar

> > +     }
> > +     cru->presetn = devm_reset_control_get_by_index(&pdev->dev, 1);
> > +     if (IS_ERR(cru->presetn)) {
> > +             dev_err(&pdev->dev, "failed to get cpg presetn\n");
> > +             return PTR_ERR(cru->presetn);
> > +     }
> > +     cru->aresetn = devm_reset_control_get_by_index(&pdev->dev, 2);
> > +     if (IS_ERR(cru->aresetn)) {
> > +             dev_err(&pdev->dev, "failed to get cpg aresetn\n");
> > +             return PTR_ERR(cru->aresetn);
> > +     }
>
> regards
> Philipp