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Devices which may take a while to initialize during probe and which have no strong reason to probe synchronously can request asynchronous probing as default probe strategy. This can speed-up start times on some platforms. The KX022A gets probe delayed for at least two reasons. It enables the supply regulator, (which is likely to have ramp-up delay if it was disabled) and additionally it delays while the sensor itself is initializing. Changing to asynchronous probing may cause problems. Some of which are discussed in: https://lore.kernel.org/all/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk/ Enable asynchronous probing for KX022A. Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Link: https://lore.kernel.org/r/24cea76c282a28b7a4dba297ab627176f8097907.1683185765.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 ROHM Semiconductors
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*
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* ROHM/KIONIX KX022A accelerometer driver
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*/
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include "kionix-kx022a.h"
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static int kx022a_spi_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct regmap *regmap;
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if (!spi->irq) {
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dev_err(dev, "No IRQ configured\n");
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return -EINVAL;
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}
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regmap = devm_regmap_init_spi(spi, &kx022a_regmap);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"Failed to initialize Regmap\n");
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return kx022a_probe_internal(dev);
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}
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static const struct spi_device_id kx022a_id[] = {
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{ "kx022a" },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, kx022a_id);
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static const struct of_device_id kx022a_of_match[] = {
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{ .compatible = "kionix,kx022a", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, kx022a_of_match);
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static struct spi_driver kx022a_spi_driver = {
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.driver = {
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.name = "kx022a-spi",
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.of_match_table = kx022a_of_match,
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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.probe = kx022a_spi_probe,
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.id_table = kx022a_id,
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};
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module_spi_driver(kx022a_spi_driver);
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MODULE_DESCRIPTION("ROHM/Kionix kx022A accelerometer driver");
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MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(IIO_KX022A);
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