linux-kernel - Re: [PATCH v17 06/12] soc: mediatek: Add support for hierarchical scpsys device node

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Date:   Wed, 30 Sep 2020 11:37:19 +0800
From:   Weiyi Lu <weiyi.lu@...iatek.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
CC:     Enric Balletbo Serra <eballetbo@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        James Liao <jamesjj.liao@...iatek.com>,
        Fan Chen <fan.chen@...iatek.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v17 06/12] soc: mediatek: Add support for hierarchical
 scpsys device node

On Mon, 2020-09-28 at 15:14 +0800, Nicolas Boichat wrote:
> On Thu, Aug 6, 2020 at 5:22 PM Weiyi Lu <weiyi.lu@...iatek.com> wrote:
> >
> > Try to list all the power domains of under power controller
> > node to show the dependency between each power domain directly
> > instead of filling the dependency in scp_soc_data.
> > And could be more clearly to group subsys clocks into power domain
> > sub node to introduce subsys clocks of bus protection in next patch.
> >
> > Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
> > ---
> [snip]
> > +static int traverse_scp(struct platform_device *pdev, struct scp *scp,
> > +                       const struct scp_domain_data *scp_domain_data)
> > +{
> > +       struct device *dev = &pdev->dev;
> > +       struct device_node *np = dev->of_node;
> > +       struct device_node *sub;
> > +       int ret;
> > +
> > +       INIT_LIST_HEAD(&scp->dep_links);
> > +
> > +       for_each_available_child_of_node(np, sub) {
> > +               ret = scpsys_get_domain(pdev, scp, sub, scp_domain_data);
> > +               if (ret) {
> > +                       dev_err(&pdev->dev, "failed to handle node %pOFn: %d\n", sub, ret);
> 
> minor comment: this error should not be printed if ret ==
> -EPROBE_DEFER (use the new dev_err_probe?)
> 

You're right! I'll use dev_err_probe() instead if anyone is interested
in this series. Thank you!

> > +                       goto err;
> > +               }
> > +       }
> > +
> > +       return 0;
> > +
> > +err:
> > +       of_node_put(sub);
> > +       return ret;
> > +}
> [snip]