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3fcd3d2fe4
Add a new driver for the ADI Util Sigma-Delta SPI FPGA IP core. This is used to trigger a SPI offload based on a RDY signal from an ADC while masking out other signals on the same line. Signed-off-by: David Lechner <dlechner@baylibre.com> Link: https://patch.msgid.link/20250627-iio-adc-ad7173-add-spi-offload-support-v2-9-f49c55599113@baylibre.com Signed-off-by: Mark Brown <broonie@kernel.org>
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2025 Analog Devices Inc.
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* Copyright (C) 2025 BayLibre, SAS
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/spi/offload/provider.h>
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static bool adi_util_sigma_delta_match(struct spi_offload_trigger *trigger,
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enum spi_offload_trigger_type type,
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u64 *args, u32 nargs)
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{
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return type == SPI_OFFLOAD_TRIGGER_DATA_READY && nargs == 0;
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}
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static const struct spi_offload_trigger_ops adi_util_sigma_delta_ops = {
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.match = adi_util_sigma_delta_match,
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};
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static int adi_util_sigma_delta_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct spi_offload_trigger_info info = {
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.fwnode = dev_fwnode(dev),
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.ops = &adi_util_sigma_delta_ops,
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};
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struct clk *clk;
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clk = devm_clk_get_enabled(dev, NULL);
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if (IS_ERR(clk))
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return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n");
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return devm_spi_offload_trigger_register(dev, &info);
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}
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static const struct of_device_id adi_util_sigma_delta_of_match_table[] = {
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{ .compatible = "adi,util-sigma-delta-spi", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adi_util_sigma_delta_of_match_table);
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static struct platform_driver adi_util_sigma_delta_driver = {
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.probe = adi_util_sigma_delta_probe,
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.driver = {
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.name = "adi-util-sigma-delta-spi",
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.of_match_table = adi_util_sigma_delta_of_match_table,
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},
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};
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module_platform_driver(adi_util_sigma_delta_driver);
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MODULE_AUTHOR("David Lechner <dlechner@baylibre.com>");
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MODULE_DESCRIPTION("ADI Sigma-Delta SPI offload trigger utility driver");
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MODULE_LICENSE("GPL");
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