linux-kernel - Re: [PATCH 2/3] soc: amlogic: Add support for Secure power domains controller

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Date:   Fri, 20 Sep 2019 15:58:40 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     Kevin Hilman <khilman@...libre.com>,
        <linux-amlogic@...ts.infradead.org>,
        Zhiqiang Liang <zhiqiang.liang@...ogic.com>,
        Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, Jian Hu <jian.hu@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Xingyu Chen <xingyu.chen@...ogic.com>
Subject: Re: [PATCH 2/3] soc: amlogic: Add support for Secure power domains
 controller

Hi Martin,

On 2019/9/20 4:03, Martin Blumenstingl wrote:
> Hi Jianxin,
> 
> I added three comments below from a quick glance at this driver (I
> didn't have time for a complete review)
> 
> On Thu, Sep 19, 2019 at 2:11 PM Jianxin Pan <jianxin.pan@...ogic.com> wrote:
> [...]
>> +               pm_genpd_init(&dom->base, NULL,
>> +                             (match->domains[i].get_power ?
>> +                             match->domains[i].get_power(dom) : true));
> .get_power is never NULL in this driver so the ": true" part is
> effectively a no-op
> 
OK, I will remove it. Thanks for your time.
> [...]
>> +static const struct of_device_id meson_secure_pwrc_match_table[] = {
>> +       {
>> +               .compatible = "amlogic,meson-a1-pwrc",
>> +               .data = &meson_secure_a1_pwrc_data,
>> +       },
>> +       { }
> many drivers use a /* sentinel */ comment inside { }
> 
OK, I will add this comment line.
> [...]
>> +arch_initcall_sync(meson_secure_pwrc_init);
> why arch_initcall_sync instead of builtin_platform_driver?
> $ grep -R arch_initcall_sync drivers/soc/
> $
> 
> 
> Martin
> 
The power-domain is depended by many other drivers, arch_initcall_sync is used to make power-domain probe earlier.
Maybe I need to switch back to builtin_platform_driver when use APIs from meson_sm.c. 
> .
>