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

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Date:   Mon, 28 Sep 2020 15:14:52 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Weiyi Lu <weiyi.lu@...iatek.com>
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 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?)

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