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The devices from the ADAU17X1 family all have a MCLK clock input which supplies the master clock for the device. The master clock is used as the input clock for the PLL. Currently the MCLK rate as well as the desired PLL output frequency need to be supplied by calling snd_soc_dai_set_pll() form a machine driver. Add support for specifying the MCLK using the common clock framework. In addition to that also automatically configure the PLL to a suitable rate if the master clock was provided using the CCW. This allows to use the CODEC driver without any special configuration requirements from the machine driver. While the PLL output frequency can be configured over a (more or less) continuous range the narrowness of the range and the other constraints of the clocking tree usually only result in two output frequencies that will actually be chosen. One for 44.1kHz based rates and one for 48kHz based rates, these are the rates that the automatic PLL configuration will use. For the rare case where a non-standard setup is required a machine driver can disable the auto-configuration and configure a custom frequency using the existing mechanisms. If the common clock framework is not enabled clk_get() will return NULL and the driver will function as before and the clock rate needs to be configured manually. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*
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* Driver for ADAU1381/ADAU1781 CODEC
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*
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* Copyright 2014 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/i2c.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <sound/soc.h>
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#include "adau1781.h"
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static int adau1781_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct regmap_config config;
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config = adau1781_regmap_config;
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config.val_bits = 8;
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config.reg_bits = 16;
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return adau1781_probe(&client->dev,
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devm_regmap_init_i2c(client, &config),
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id->driver_data, NULL);
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}
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static int adau1781_i2c_remove(struct i2c_client *client)
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{
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adau17x1_remove(&client->dev);
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return 0;
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}
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static const struct i2c_device_id adau1781_i2c_ids[] = {
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{ "adau1381", ADAU1381 },
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{ "adau1781", ADAU1781 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, adau1781_i2c_ids);
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#if defined(CONFIG_OF)
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static const struct of_device_id adau1781_i2c_dt_ids[] = {
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{ .compatible = "adi,adau1381", },
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{ .compatible = "adi,adau1781", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, adau1781_i2c_dt_ids);
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#endif
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static struct i2c_driver adau1781_i2c_driver = {
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.driver = {
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.name = "adau1781",
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.of_match_table = of_match_ptr(adau1781_i2c_dt_ids),
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},
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.probe = adau1781_i2c_probe,
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.remove = adau1781_i2c_remove,
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.id_table = adau1781_i2c_ids,
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};
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module_i2c_driver(adau1781_i2c_driver);
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MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC I2C driver");
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_LICENSE("GPL");
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