linux-kernel - Re: [PATCH v6 2/5] clk: qcom: Add LUCID

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Date:   Mon, 6 Dec 2021 20:35:19 -0800
From:   Vamsi Krishna Lanka <quic_vamslank@...cinc.com>
To:     Stephen Boyd <sboyd@...nel.org>
CC:     <agross@...nel.org>, <bjorn.andersson@...aro.org>,
        <maz@...nel.org>, <mturquette@...libre.com>, <robh+dt@...nel.org>,
        <tglx@...utronix.de>, <linux-arm-msm@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <manivannan.sadhasivam@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v6 2/5] clk: qcom: Add LUCID_EVO PLL type for SDX65

On Thu, Dec 02, 2021 at 04:18:43PM -0800, Stephen Boyd wrote:
> Quoting quic_vamslank@...cinc.com (2021-12-01 16:21:32)
> > diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> > index eaedcceb766f..e0c67b76d8ac 100644
> > --- a/drivers/clk/qcom/clk-alpha-pll.c
> > +++ b/drivers/clk/qcom/clk-alpha-pll.c
> > @@ -1741,35 +1760,47 @@ static int alpha_pll_lucid_5lpe_set_rate(struct clk_hw *hw, unsigned long rate,
> >                                           LUCID_5LPE_ALPHA_PLL_ACK_LATCH);
> >  }
> >  
> > +static int __clk_lucid_pll_postdiv_set_rate(struct clk_hw *hw, unsigned long rate,
> > +                                            unsigned long parent_rate, unsigned long enable_vote_run)
> > +{
> > +        struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw);
> > +       struct regmap *regmap = pll->clkr.regmap;
> 
> What's going on with the tabbing here?

Yes, actually i used a tab instead of space here. I will correct it.

> 
> > +        int i, val = 0, div, ret;
> 
> Do we need to initialize to 0?

Not needed. Will remove.

> 
> > +        u32 mask;
> > +
> > +        /*
> > +         * If the PLL is in FSM mode, then treat set_rate callback as a
> > +         * no-operation.
> > +         */
> > +        ret = regmap_read(regmap, PLL_USER_CTL(pll), &val);
> > +        if (ret)
> > +                return ret;
> > +
> > +        if (val & enable_vote_run)
> > +                return 0;
> > +
> > +        if (!pll->post_div_table) {
> > +                pr_err("Missing the post_div_table for the PLL\n");
> 
> Probably useful to know which PLL is missing a table here.

I think that's a good idea on returning which PLL is missing a table. 


Thanks,
Vamsi