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

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Date:   Mon, 3 Jul 2017 16:01:40 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     mturquette@...libre.com, sboyd@...eaurora.org, robh+dt@...nel.org,
        mark.rutland@....com, nicolas.ferre@...rochip.com,
        alexandre.belloni@...e-electrons.com, linux@...linux.org.uk,
        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, 23 Jun 2017 11:00:55 +0200
Quentin Schulz <quentin.schulz@...e-electrons.com> 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 +

As already mentioned by Alex, DT bindings should go in a separate patch

>  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 +-

Same goes for the atmel-classd changes.

>  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
> 

[...]

> diff --git a/drivers/clk/at91/clk-audio-pll-pmc.c b/drivers/clk/at91/clk-audio-pll-pmc.c
> new file mode 100644
> index 000000000000..208d0b59eb4e
> --- /dev/null
> +++ b/drivers/clk/at91/clk-audio-pll-pmc.c
> @@ -0,0 +1,175 @@
> +/*
> + *  Copyright (C) 2016 Atmel Corporation,
> + *                     Nicolas Ferre <nicolas.ferre@...el.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + */
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk/at91_pmc.h>
> +#include <linux/of.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +
> +#include "pmc.h"
> +
> +/*
> + * DOC: PMC output for fractional PLL clock for audio
> + *
> + * Traits of this clock:
> + * enable - clk_enable writes qdpmc, and enables PMC output
> + * rate - rate is adjustable.
> + *        clk->rate = parent->rate / (qdpmc + 1)
> + * parent - fixed parent.  No clk_set_parent support
> + */
> +
> +#define AUDIO_PLL_FOUT_MIN		620000000
> +#define AUDIO_PLL_FOUT_MAX		700000000
> +#define AUDIO_PLL_REFERENCE_FOUT	660000000

These 3 macros are not unused, you can drop them.