linux-kernel - Re: [PATCH v9 2/5] clk: meson: a1: add Amlogic A1 PLL clock controller driver

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Date:   Mon, 13 Mar 2023 13:25:16 +0300
From:   Dmitry Rokosov <ddrokosov@...rdevices.ru>
To:     Jerome Brunet <jbrunet@...libre.com>
CC:     <neil.armstrong@...aro.org>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <khilman@...libre.com>,
        <martin.blumenstingl@...glemail.com>, <jian.hu@...ogic.com>,
        <kernel@...rdevices.ru>, <rockosov@...il.com>,
        <linux-amlogic@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 2/5] clk: meson: a1: add Amlogic A1 PLL clock
 controller driver

On Mon, Mar 13, 2023 at 10:18:02AM +0100, Jerome Brunet wrote:
> 
> On Thu 09 Mar 2023 at 21:28, Dmitry Rokosov <ddrokosov@...rdevices.ru> wrote:
> 
> >> >> 
> >> >> This last poke should not bits otherwise handled by parms.
> >> >> This is a rate init in disguise.
> >> >> 
> >> >
> >> > I believe, you are talking about hifi_pll clk_regmap conflicts with
> >> > hifi_init_regs. The above init sequence shouldn't affect pll regmap setup,
> >> > it doesn't touch them (we assume that default bit values are all zero):
> >> >
> >> >     .en = {
> >> >         .reg_off = ANACTRL_HIFIPLL_CTRL0,
> >> >         .shift   = 28,
> >> >         .width   = 1,
> >> >     },
> >> >     // init_value = 0x01f18440
> >> >     // en_mask    = 0x10000000
> >> >
> >> >     .m = {
> >> >         .reg_off = ANACTRL_HIFIPLL_CTRL0,
> >> >         .shift   = 0,
> >> >         .width   = 8,
> >> >     },
> >> >     // init_value = 0x01f18440
> >> >     // m_mask     = 0x0000000f
> >> 
> >> mask is 0xff with width 8
> >> 
> >
> > Ah, you're right. Anyway, I think this is just init value and it's okay
> > to set it during initialization and rewrite after in parameter
> > propagation stage.
> >
> 
> ... But the magic pokes are there only to initialize the unmanaged part
> of the clock regs. I'd like it to be clear and stay that way.
> 
> So please, clear the managed fields from the initial poke table.

I've double checked hifi_pll clk. In the my current configuration no any
clks inherited from it. Therefore its 'enable_count' equals to 0.
And of course in the such situation the rate must be zeroed as well.
It means you are right at all. I'll remove pre_sel and fbkdiv hifi_pll
pre-setup in the next version.
Thank you for hunted down!

-- 
Thank you,
Dmitry