linux-kernel - Re: [PATCH v2 4/6] clk: actions: Fix AHPPREDIV-H-AHB clock chain on Owl S500 SoC

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Message-ID: <20210610201025.GA1497285@BV030612LT>
Date:   Thu, 10 Jun 2021 23:10:25 +0300
From:   Cristian Ciocaltea <cristian.ciocaltea@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        Michael Turquette <mturquette@...libre.com>,
        Edgar Bernardi Righi <edgar.righi@...tec.org.br>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/6] clk: actions: Fix AHPPREDIV-H-AHB clock chain on
 Owl S500 SoC

On Thu, Jun 10, 2021 at 08:04:13PM +0530, Manivannan Sadhasivam wrote:
> On Thu, May 27, 2021 at 04:16:42PM +0300, Cristian Ciocaltea wrote:
> > There are a few issues with the setup of the Actions Semi Owl S500 SoC's
> > clock chain involving AHPPREDIV, H and AHB clocks:
> > 
> > * AHBPREDIV clock is defined as a muxer only, although it also acts as
> >   a divider.
> > * H clock is using a wrong divider register offset
> > * AHB is defined as a multi-rate factor clock, but it is actually just
> >   a fixed pass clock.
> > 
> > Let's provide the following fixes:
> > 
> > * Change AHBPREDIV clock to an ungated OWL_COMP_DIV definition.
> > * Use the correct register shift value in the OWL_DIVIDER definition
> >   for H clock
> > * Drop the unneeded 'ahb_factor_table[]' and change AHB clock to an
> >   ungated OWL_COMP_FIXED_FACTOR definition.

[...]

> >  /* composite clocks */
> > +static OWL_COMP_DIV(ahbprediv_clk, "ahbprediv_clk", ahbprediv_clk_mux_p,
> > +			OWL_MUX_HW(CMU_BUSCLK1, 8, 3),
> > +			{ 0 },
> > +			OWL_DIVIDER_HW(CMU_BUSCLK1, 12, 2, 0, NULL),
> > +			0);
> > +
> > +static OWL_COMP_FIXED_FACTOR(ahb_clk, "ahb_clk", "h_clk",
> > +			{ 0 },
> > +			1, 1, CLK_SET_RATE_PARENT);
> 
> I think you swapped the flags between "ahbprediv_clk" and "ahb_clk"...

Thanks for noticing this, I fixed it in v3:
https://lore.kernel.org/lkml/cover.1623354574.git.cristian.ciocaltea@gmail.com/

> > +
> >  static OWL_COMP_FACTOR(vce_clk, "vce_clk", hde_clk_mux_p,
> >  			OWL_MUX_HW(CMU_VCECLK, 4, 2),
> >  			OWL_GATE_HW(CMU_DEVCLKEN0, 26, 0),
> > -- 
> > 2.31.1
> >