Subject: Re: [RFC/RFT v3 07/14] clk: meson: g12a: add notifiers to handle cpu clock change

From: Stephen Boyd <[email-masked]>
Date: Wed, 07 Aug 2019 21:43:21 -0700

Quoting Martin Blumenstingl (2019-07-02 16:28:55)
> Hi Stephen, Hi Neil,
> 
> On Mon, Jul 1, 2019 at 11:13 AM Neil Armstrong <[email-masked]> wrote:
> >
> > In order to implement clock switching for the CLKID_CPU_CLK and
> > CLKID_CPUB_CLK, notifiers are added on specific points of the
> > clock tree :
> >
> > cpu_clk / cpub_clk
> > |   \- cpu_clk_dyn
> > |      |  \- cpu_clk_premux0
> > |      |        |- cpu_clk_postmux0
> > |      |        |    |- cpu_clk_dyn0_div
> > |      |        |    \- xtal/fclk_div2/fclk_div3
> > |      |        \- xtal/fclk_div2/fclk_div3
> > |      \- cpu_clk_premux1
> > |            |- cpu_clk_postmux1
> > |            |    |- cpu_clk_dyn1_div
> > |            |    \- xtal/fclk_div2/fclk_div3
> > |            \- xtal/fclk_div2/fclk_div3
> > \ sys_pll / sys1_pll
> >
> > This for each cluster, a single one for G12A, two for G12B.
> >
> > Each cpu_clk_premux1 tree is marked as read-only and CLK_SET_RATE_NO_REPARENT,
> > to be used as "parking" clock in a safe clock frequency.
> it seems that this is one case where the "coordinated clocks" feature
> would come handy: [0]
> Stephen, do you know if those patches stopped in March or if there's
> still some ongoing effort to get them ready?
> 

Derek told me yesterday he wants to work on it again, but I don't know
his timeline. If Derek doesn't reply here then maybe it can be picked up
by someone else.

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