linux-kernel - Re: [PATCH v6 03/18] clk: qcom: gcc-ipq806x: add PXO

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Message-ID: <Yj0XTYgoMScoiUHP@Ansuel-xps.localdomain>
Date:   Fri, 25 Mar 2022 02:13:49 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 03/18] clk: qcom: gcc-ipq806x: add PXO_SRC in clk table

On Thu, Mar 24, 2022 at 06:10:35PM -0700, Stephen Boyd wrote:
> Quoting Ansuel Smith (2022-03-21 16:15:33)
> > PXO_SRC is currently defined in the gcc include and referenced in the
> > ipq8064 DTSI. Correctly provide a clk after gcc probe to fix kernel
> > panic if a driver starts to actually use it.
> > 
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > ---
> 
> What is this patch about? clk providers shouldn't be calling clk_get().
>

If pxo is passed as a clock in dts and defined as a fixed clock, what
should be used? 

> >  drivers/clk/qcom/gcc-ipq806x.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/clk/qcom/gcc-ipq806x.c b/drivers/clk/qcom/gcc-ipq806x.c
> > index 27f6d7626abb..7271d3afdc89 100644
> > --- a/drivers/clk/qcom/gcc-ipq806x.c
> > +++ b/drivers/clk/qcom/gcc-ipq806x.c
> > @@ -26,6 +26,8 @@
> >  #include "clk-hfpll.h"
> >  #include "reset.h"
> >  
> > +static struct clk_regmap pxo = { };
> > +
> >  static struct clk_pll pll0 = {
> >         .l_reg = 0x30c4,
> >         .m_reg = 0x30c8,
> > @@ -2754,6 +2756,7 @@ static struct clk_dyn_rcg ubi32_core2_src_clk = {
> >  };
> >  
> >  static struct clk_regmap *gcc_ipq806x_clks[] = {
> > +       [PXO_SRC] = NULL,
> >         [PLL0] = &pll0.clkr,
> >         [PLL0_VOTE] = &pll0_vote,
> >         [PLL3] = &pll3.clkr,
> > @@ -3083,6 +3086,10 @@ static int gcc_ipq806x_probe(struct platform_device *pdev)
> >         if (ret)
> >                 return ret;
> >  
> > +       clk = clk_get(dev, "pxo");
> > +       pxo.hw = *__clk_get_hw(clk);
> > +       gcc_ipq806x_clks[PXO_SRC] = &pxo;
> > +
> >         regmap = dev_get_regmap(dev, NULL);
> >         if (!regmap)
> >                 return -ENODEV;
> > -- 
> > 2.34.1
> >

-- 
	Ansuel