linux-stable/sound/soc/codecs/wm8804-spi.c
Charles Keepax 1a60667fc8 ASoC: wm8804: Enable runtime PM
Currently both the oscillator and the PLL are powered up in
set_bias_level. This can be problematic when using output clocks from
the wm8804 for other devices. The snd_soc_codec_set_pll API defines that
a clock should be available once the call returns, however, with all the
clocking controlled in set_bias_level this is not currently the case.

This patch enables pm_runtime for the wm8804, enabling both the
regulators and the oscillator when the chip resumes, and enabling the
PLL in the snd_soc_codec_set_pll call. Naturally the enabling the PLL
will also cause the chip to resume.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-08 19:25:40 +01:00

57 lines
1.3 KiB
C

/*
* wm8804-spi.c -- WM8804 S/PDIF transceiver driver - SPI
*
* Copyright 2015 Cirrus Logic Inc
*
* Author: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include "wm8804.h"
static int wm8804_spi_probe(struct spi_device *spi)
{
struct regmap *regmap;
regmap = devm_regmap_init_spi(spi, &wm8804_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return wm8804_probe(&spi->dev, regmap);
}
static int wm8804_spi_remove(struct spi_device *spi)
{
wm8804_remove(&spi->dev);
return 0;
}
static const struct of_device_id wm8804_of_match[] = {
{ .compatible = "wlf,wm8804", },
{ }
};
MODULE_DEVICE_TABLE(of, wm8804_of_match);
static struct spi_driver wm8804_spi_driver = {
.driver = {
.name = "wm8804",
.owner = THIS_MODULE,
.pm = &wm8804_pm,
.of_match_table = wm8804_of_match,
},
.probe = wm8804_spi_probe,
.remove = wm8804_spi_remove
};
module_spi_driver(wm8804_spi_driver);
MODULE_DESCRIPTION("ASoC WM8804 driver - SPI");
MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");