linux-kernel - Re: [RFC PATCH 3/3] clk: lan966x: Extend lan966x clock driver for clock gating support

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Date:   Sun, 31 Oct 2021 10:03:27 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Stephen Boyd <sboyd@...nel.org>
CC:     <mturquette@...libre.com>, <robh+dt@...nel.org>,
        <nicolas.ferre@...rochip.com>, <kavyasree.kotagiri@...rochip.com>,
        <eugen.hristev@...rochip.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/3] clk: lan966x: Extend lan966x clock driver for
 clock gating support

The 10/29/2021 16:32, Stephen Boyd wrote:
> 
> Quoting Horatiu Vultur (2021-10-29 02:35:56)
> > The 10/28/2021 23:41, Stephen Boyd wrote:
> >
> > Hi Stephen,
> >
> > >
> > > Quoting Horatiu Vultur (2021-10-19 01:44:49)
> > > > diff --git a/drivers/clk/clk-lan966x.c b/drivers/clk/clk-lan966x.c
> > > > index 19bec94e1551..40be47092a31 100644
> > > > --- a/drivers/clk/clk-lan966x.c
> > > > +++ b/drivers/clk/clk-lan966x.c
> > > > @@ -188,26 +202,64 @@ static struct clk_hw *lan966x_gck_clk_register(struct device *dev, int i)
> > > >         return &priv->hw;
> > > >  };
> > > >
> > > > +static int lan966x_gate_clk_register(struct device *dev,
> > > > +                                    struct clk_hw_onecell_data *hw_data,
> > > > +                                    void __iomem *gate_base)
> > > > +{
> > > > +       int i;
> > > > +
> > > > +       for (i = GCK_GATE_UHPHS; i < N_CLOCKS; ++i) {
> > > > +               int idx = i - GCK_GATE_UHPHS;
> > > > +
> > > > +               hw_data->hws[i] =
> > > > +                       clk_hw_register_gate(dev, clk_gate_desc[idx].name,
> > >
> > > Use devm?
> >
> > I couldn't find any devm_clk_hw_register_gate or something similar for
> > the gate.
> 
> Add one?

Yes, I will do that.

> 
> >
> > >
> > > > +                                            "lan966x", 0, base,
> > > > +                                            clk_gate_desc[idx].bit_idx,
> > > > +                                            0, &clk_gate_lock);
> > > > +
> > > > +               if (IS_ERR(hw_data->hws[i]))
> > > > +                       return dev_err_probe(dev, PTR_ERR(hw_data->hws[i]),
> > > > +                                            "failed to register %s clock\n",
> > > > +                                            clk_gate_desc[idx].name);
> > > > +       }
> > > > +
> > > > +       return 0;
> > > > +}
> > > > +
> > > > +static void lan966x_gate_clk_unregister(struct clk_hw_onecell_data *hw_data)
> > > > +{
> > > > +       int i;
> > > > +
> > > > +       for (i = GCK_GATE_UHPHS; i < N_CLOCKS; ++i)
> > >
> > > for (int i =
> > >
> > > should suffice
> >
> > That would not work. I will get the error:
> > error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode
> 
> Ah ok

-- 
/Horatiu