spi: offload trigger: add ADI Util Sigma-Delta SPI driver

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>

diff --git a/MAINTAINERS b/MAINTAINERS
index d7b5e85722794eaca00c8b0cb4eb8a36e7c28ad6..d0d5b822a1f729789ccf80ec8f6c06aac2372977 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23413,7 +23413,7 @@ F:      include/linux/mtd/spi-nor.h
 
 SPI OFFLOAD
 R:     David Lechner <dlechner@baylibre.com>
-F:     drivers/spi/spi-offload-trigger-pwm.c
+F:     drivers/spi/spi-offload-trigger-*.c
 F:     drivers/spi/spi-offload.c
 F:     include/linux/spi/offload/
 K:     spi_offload

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index c51da3fc3604977b05388687e5e64a58370186c4..e69f060d3875c168a2dc701a372e47b8ffd33268 100644 (file)
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -1355,6 +1355,11 @@ if SPI_OFFLOAD
 
 comment "SPI Offload triggers"
 
+config SPI_OFFLOAD_TRIGGER_ADI_UTIL_SD
+       tristate "SPI offload trigger using ADI sigma-delta utility"
+       help
+         SPI offload trigger from ADI sigma-delta utility FPGA IP block.
+
 config SPI_OFFLOAD_TRIGGER_PWM
        tristate "SPI offload trigger using PWM"
        depends on PWM

diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 4ea89f6fc531625060255ecff237470927e1f041..51f9f16ed734424ff10672a04f2ec166dc637e0b 100644 (file)
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -170,3 +170,4 @@ obj-$(CONFIG_SPI_SLAVE_SYSTEM_CONTROL)      += spi-slave-system-control.o
 
 # SPI offload triggers
 obj-$(CONFIG_SPI_OFFLOAD_TRIGGER_PWM)  += spi-offload-trigger-pwm.o
+obj-$(CONFIG_SPI_OFFLOAD_TRIGGER_ADI_UTIL_SD) += spi-offload-trigger-adi-util-sigma-delta.o

diff --git a/drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c b/drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c
new file mode 100644 (file)
index 0000000..035d088
--- /dev/null
+++ b/drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2025 Analog Devices Inc.
+ * Copyright (C) 2025 BayLibre, SAS
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/spi/offload/provider.h>
+
+static bool adi_util_sigma_delta_match(struct spi_offload_trigger *trigger,
+                                      enum spi_offload_trigger_type type,
+                                      u64 *args, u32 nargs)
+{
+       return type == SPI_OFFLOAD_TRIGGER_DATA_READY && nargs == 0;
+}
+
+static const struct spi_offload_trigger_ops adi_util_sigma_delta_ops = {
+       .match = adi_util_sigma_delta_match,
+};
+
+static int adi_util_sigma_delta_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct spi_offload_trigger_info info = {
+               .fwnode = dev_fwnode(dev),
+               .ops = &adi_util_sigma_delta_ops,
+       };
+       struct clk *clk;
+
+       clk = devm_clk_get_enabled(dev, NULL);
+       if (IS_ERR(clk))
+               return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n");
+
+       return devm_spi_offload_trigger_register(dev, &info);
+}
+
+static const struct of_device_id adi_util_sigma_delta_of_match_table[] = {
+       { .compatible = "adi,util-sigma-delta-spi", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, adi_util_sigma_delta_of_match_table);
+
+static struct platform_driver adi_util_sigma_delta_driver = {
+       .probe  = adi_util_sigma_delta_probe,
+       .driver = {
+               .name = "adi-util-sigma-delta-spi",
+               .of_match_table = adi_util_sigma_delta_of_match_table,
+       },
+};
+module_platform_driver(adi_util_sigma_delta_driver);
+
+MODULE_AUTHOR("David Lechner <dlechner@baylibre.com>");
+MODULE_DESCRIPTION("ADI Sigma-Delta SPI offload trigger utility driver");
+MODULE_LICENSE("GPL");