linux-kernel - Re: [PATCH v2 04/14] reset: starfive: Factor out common JH71X0 reset code

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Message-ID: <CAJM55Z-eQMXES0v4m-a6THyydyCDhqD0=ETjk8_bWxTw_Q5sLw@mail.gmail.com>
Date:   Mon, 21 Nov 2022 12:26:45 +0100
From:   Emil Renner Berthing <emil.renner.berthing@...onical.com>
To:     Hal Feng <hal.feng@...rfivetech.com>
Cc:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        Conor Dooley <conor@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 04/14] reset: starfive: Factor out common JH71X0 reset code

On Mon, 21 Nov 2022 at 10:24, Hal Feng <hal.feng@...rfivetech.com> wrote:
>
> On Sat, 19 Nov 2022 00:39:35 +0800, Emil Renner Berthing wrote:
> > On Fri, 18 Nov 2022 at 02:06, Hal Feng <hal.feng@...rfivetech.com> wrote:
> > > diff --git a/drivers/reset/starfive/reset-starfive-jh7100.c b/drivers/reset/starfive/reset-starfive-jh71x0.c
> > > similarity index 50%
> > > copy from drivers/reset/starfive/reset-starfive-jh7100.c
> > > copy to drivers/reset/starfive/reset-starfive-jh71x0.c
> > > index fc44b2fb3e03..1e230f3f9841 100644
> > > --- a/drivers/reset/starfive/reset-starfive-jh7100.c
> > > +++ b/drivers/reset/starfive/reset-starfive-jh71x0.c
>
> [...]
>
> > > -static int __init jh7100_reset_probe(struct platform_device *pdev)
> > > +int reset_starfive_jh7100_register(struct device *dev, struct device_node *of_node,
> > > +                                  void __iomem *assert, void __iomem *status,
> > > +                                  const u64 *asserted, unsigned int nr_resets,
> > > +                                  bool is_module)
> > >  {
> > >         struct jh7100_reset *data;
> > >
> > > -       data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> > > +       data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> > >         if (!data)
> > >                 return -ENOMEM;
> > >
> > > -       data->base = devm_platform_ioremap_resource(pdev, 0);
> > > -       if (IS_ERR(data->base))
> > > -               return PTR_ERR(data->base);
> > > -
> > >         data->rcdev.ops = &jh7100_reset_ops;
> > > -       data->rcdev.owner = THIS_MODULE;
> > > -       data->rcdev.nr_resets = JH7100_RSTN_END;
> > > -       data->rcdev.dev = &pdev->dev;
> > > -       data->rcdev.of_node = pdev->dev.of_node;
> > > +       if (is_module)
> > > +               data->rcdev.owner = THIS_MODULE;
> >
> > nit: consider just passing the owner directly, so this would just be
> > data->rcdev.owner = owner;
> >
> > ..and callers that used false can just pass NULL.
>
> Yeah, will fix it.
>
> >
> > > +       data->rcdev.nr_resets = nr_resets;
> > > +       data->rcdev.dev = dev;
> > > +       data->rcdev.of_node = of_node;
> >
> > Is it important to register this with the auxiliary device and not
> > just use the parent device?
>
> I'm not sure whether it still works if we use the same device,

Try it.

> but
> it's general to separate the devices of clock and reset. They have
> different device names and different drivers.
>
> Best regards,
> Hal
>
> > If not you can just always pass the device that has the right of_node
> > and have this be
> >
> > data->rcdev.of_node = dev->of_node;
> >
> > > +
> > >         spin_lock_init(&data->lock);
> > > +       data->assert = assert;
> > > +       data->status = status;
> > > +       data->asserted = asserted;
> > >
> > > -       return devm_reset_controller_register(&pdev->dev, &data->rcdev);
> > > +       return devm_reset_controller_register(dev, &data->rcdev);
> > >  }
>