linux-kernel - Re: [PATCH 2/6] clk: at91: add audio pll clock driver

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Date:   Thu, 29 Jun 2017 16:47:58 -0500
From:   Rob Herring <robh@...nel.org>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     mturquette@...libre.com, sboyd@...eaurora.org,
        mark.rutland@....com, nicolas.ferre@...rochip.com,
        alexandre.belloni@...e-electrons.com, linux@...linux.org.uk,
        boris.brezillon@...e-electrons.com, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        alsa-devel@...a-project.org, thomas.petazzoni@...e-electrons.com
Subject: Re: [PATCH 2/6] clk: at91: add audio pll clock driver

On Fri, Jun 23, 2017 at 11:00:55AM +0200, Quentin Schulz wrote:
> From: Nicolas Ferre <nicolas.ferre@...el.com>
> 
> This new clock driver set allows to have a fractional divided clock that
> would generate a precise clock particularly suitable for audio
> applications.
> 
> The main audio pll clock has two children clocks: one that is connected
> to the PMC, the other that can directly drive a pad. As these two routes
> have different enable bits and different dividers and divider formula,
> they are handled by two different drivers. Each of them could modify the
> rate of the main audio pll parent.
> The main audio pll clock can output 620MHz to 700MHz.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> ---
>  .../devicetree/bindings/clock/at91-clock.txt       |  10 +

It would be nice to see at91 to transition away from a node per clock to 
just clock controller nodes. In any case:

Acked-by: Rob Herring <robh@...nel.org>

>  arch/arm/mach-at91/Kconfig                         |   4 +
>  drivers/clk/at91/Makefile                          |   2 +
>  drivers/clk/at91/clk-audio-pll-pad.c               | 204 ++++++++++++++++++
>  drivers/clk/at91/clk-audio-pll-pmc.c               | 175 +++++++++++++++
>  drivers/clk/at91/clk-audio-pll.c                   | 237 +++++++++++++++++++++
>  include/linux/clk/at91_pmc.h                       |  25 +++
>  sound/soc/atmel/atmel-classd.c                     |  20 +-
>  8 files changed, 658 insertions(+), 19 deletions(-)
>  create mode 100644 drivers/clk/at91/clk-audio-pll-pad.c
>  create mode 100644 drivers/clk/at91/clk-audio-pll-pmc.c
>  create mode 100644 drivers/clk/at91/clk-audio-pll.c