linux-kernel - Re: [PATCH] clk: meson: meson8b: Don't use MPLL1 as parent of vclk_in

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Message-ID: <CAFBinCBs=vj_rp1yk_5bvYsMQUE6Pmq8xyc6JEwBPf6CewWm0w@mail.gmail.com>
Date:   Mon, 24 May 2021 13:49:33 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     linux-amlogic@...ts.infradead.org,
        Neil Armstrong <narmstrong@...libre.com>,
        mturquette@...libre.com, sboyd@...nel.org, khilman@...libre.com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: meson: meson8b: Don't use MPLL1 as parent of vclk_in_sel

Hi Jerome,

On Mon, May 24, 2021 at 12:57 PM Jerome Brunet <jbrunet@...libre.com> wrote:
>
>
> On Mon 24 May 2021 at 12:45, Martin Blumenstingl <martin.blumenstingl@...glemail.com> wrote:
>
> > MPLL1 is needed for audio output. Drop it from the vclk_in_sel parent
> > list so we only use the (mutable) vid_pll_final_div tree or one of the
> > (fixed) FCLK_DIV{3,4,5} clocks.
>
> Are the fixed ones actually needed ?
>
> If the consumer actually lives on the vid_pll only, I'd prefer if you
> could add CLK_SET_RATE_NOREPARENT and assign the proper parent in DT with
> `assigned-clock-parents`
you're right, only the vid_pll_final_div tree is used
I just tested it with assigned-clock-parents and
CLK_SET_RATE_NO_REPARENT and it's working fine. I'll send a v2 later
today

Thanks for this suggestion!


Best regards,
Martin