linux-kernel - Re: [PATCH 0/2] clk: meson: drop clk-audio-divider

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Date:   Tue, 26 Jun 2018 13:19:45 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>
Cc:     linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] clk: meson: drop clk-audio-divider

On Wed, 2018-06-20 at 12:06 +0200, Jerome Brunet wrote:
> As explained in the commit descriptions, clk-audio-divider was a poor
> solution to make sure PLL rates would be high enough while using CCF
> rate propagation to determine audio clock rates.
> 
> Stopping rate propagation before the PLLs is actually simpler and provides
> better results. It also allow to get rid of clk-audio-divider.
> 
> Off tree sound cards using these clocks should add the following to the
> sound card DT to properly setup the PLLs:
> 
> 	assigned-clocks = <&clkc CLKID_MPLL2>,
> 	                  <&clkc CLKID_MPLL0>,
> 	                  <&clkc CLKID_MPLL1>;
> 	assigned-clock-parents = <0>, <0>, <0>;
> 	assigned-clock-rates = <294912000>,
> 	                       <270950400>,
> 	                       <393216000>;
> 
> * MPLL2: 294912000Hz: 192Khz * 32 * 24 * 2
>   used 24, 48, 96, 192Khz
> 
> * MPLL0: 270950400Hz: 176.4Khz * 32 * 24 * 2
>   used for 5.512, 10.025, 20.05, 44.1, 88.2 and 176,4Khz
> 
> * MPLL1: 393216000Hz: 64Khz * 32 * 24 * 8
>   used for 8, 16, 32 and 64Khz
> 
> Jerome Brunet (2):
>   clk: meson: stop rate propagation for audio clocks
>   clk: meson: remove unused clk-audio-divider driver
> 
>  drivers/clk/meson/Makefile            |   2 +-
>  drivers/clk/meson/clk-audio-divider.c | 110 ----------------------------------
>  drivers/clk/meson/clkc.h              |   7 ---
>  drivers/clk/meson/gxbb.c              |  16 +++--
>  4 files changed, 8 insertions(+), 127 deletions(-)
>  delete mode 100644 drivers/clk/meson/clk-audio-divider.c
> 

Rebased and applied with Neil's ack.