[PATCH 2/6] clk: at91: add audio pll clock driver
From: Boris Brezillon <hidden>
Date: 2017-07-03 14:01:56
Also in:
alsa-devel, linux-clk, linux-devicetree, lkml
On Fri, 23 Jun 2017 11:00:55 +0200 Quentin Schulz [off-list ref] wrote:
From: Nicolas Ferre <redacted> 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 <redacted> Signed-off-by: Quentin Schulz <redacted> --- .../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
[...]
quoted hunk ↗ jump to hunk
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@atmel.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.