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872fc0b6bd
Higher speeds are only supported when PLL is enabled, but the current driver doesn't enable PLL outside of stream use cases, so better to set the lowest SPI speed accepted by the entire device. Move the current frequency set to the spi sub-driver so the whole device can benefit from that speed. spi-max-frequency property could be used, but ACPI systems don't support it, so by setting it in the spi sub-driver probe both Device Trees and ACPI systems are supported. Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20211123163149.1530535-2-tanureal@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// cs35l41-spi.c -- CS35l41 SPI driver
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//
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// Copyright 2017-2021 Cirrus Logic, Inc.
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//
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// Author: David Rhodes <david.rhodes@cirrus.com>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <sound/cs35l41.h>
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#include "cs35l41.h"
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static struct regmap_config cs35l41_regmap_spi = {
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.reg_bits = 32,
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.val_bits = 32,
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.pad_bits = 16,
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.reg_stride = CS35L41_REGSTRIDE,
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.reg_format_endian = REGMAP_ENDIAN_BIG,
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.val_format_endian = REGMAP_ENDIAN_BIG,
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.max_register = CS35L41_LASTREG,
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.reg_defaults = cs35l41_reg,
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.num_reg_defaults = ARRAY_SIZE(cs35l41_reg),
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.volatile_reg = cs35l41_volatile_reg,
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.readable_reg = cs35l41_readable_reg,
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.precious_reg = cs35l41_precious_reg,
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.cache_type = REGCACHE_RBTREE,
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};
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static const struct spi_device_id cs35l41_id_spi[] = {
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{ "cs35l40", 0 },
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{ "cs35l41", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(spi, cs35l41_id_spi);
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static int cs35l41_spi_probe(struct spi_device *spi)
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{
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const struct regmap_config *regmap_config = &cs35l41_regmap_spi;
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struct cs35l41_platform_data *pdata = dev_get_platdata(&spi->dev);
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struct cs35l41_private *cs35l41;
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int ret;
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cs35l41 = devm_kzalloc(&spi->dev, sizeof(struct cs35l41_private), GFP_KERNEL);
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if (!cs35l41)
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return -ENOMEM;
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spi->max_speed_hz = CS35L41_SPI_MAX_FREQ;
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spi_setup(spi);
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spi_set_drvdata(spi, cs35l41);
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cs35l41->regmap = devm_regmap_init_spi(spi, regmap_config);
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if (IS_ERR(cs35l41->regmap)) {
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ret = PTR_ERR(cs35l41->regmap);
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dev_err(&spi->dev, "Failed to allocate register map: %d\n", ret);
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return ret;
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}
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cs35l41->dev = &spi->dev;
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cs35l41->irq = spi->irq;
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return cs35l41_probe(cs35l41, pdata);
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}
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static int cs35l41_spi_remove(struct spi_device *spi)
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{
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struct cs35l41_private *cs35l41 = spi_get_drvdata(spi);
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cs35l41_remove(cs35l41);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id cs35l41_of_match[] = {
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{ .compatible = "cirrus,cs35l40" },
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{ .compatible = "cirrus,cs35l41" },
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{},
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};
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MODULE_DEVICE_TABLE(of, cs35l41_of_match);
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#endif
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id cs35l41_acpi_match[] = {
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{ "CSC3541", 0 }, /* Cirrus Logic PnP ID + part ID */
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{},
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};
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MODULE_DEVICE_TABLE(acpi, cs35l41_acpi_match);
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#endif
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static struct spi_driver cs35l41_spi_driver = {
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.driver = {
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.name = "cs35l41",
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.of_match_table = of_match_ptr(cs35l41_of_match),
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.acpi_match_table = ACPI_PTR(cs35l41_acpi_match),
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},
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.id_table = cs35l41_id_spi,
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.probe = cs35l41_spi_probe,
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.remove = cs35l41_spi_remove,
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};
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module_spi_driver(cs35l41_spi_driver);
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MODULE_DESCRIPTION("SPI CS35L41 driver");
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MODULE_AUTHOR("David Rhodes, Cirrus Logic Inc, <david.rhodes@cirrus.com>");
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MODULE_LICENSE("GPL");
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