iio: adc: ad7173: add SPI offload support

Merge series from David Lechner <dlechner@baylibre.com>:

Also there is a new dt-binding and driver for a special SPI offload
trigger FPGA IP core that is used in this particular setup.

4 files changed, 72 insertions, 5 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f2d2295a5501..feb58bb4e42b 100644
--- 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 4ea89f6fc531..51f9f16ed734 100644
--- 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-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index fe0f122f07b0..aa1932ba17cb 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1958,10 +1958,10 @@ static int cqspi_probe(struct platform_device *pdev)
 			goto probe_setup_failed;
 	}
 
-	ret = devm_pm_runtime_enable(dev);
-	if (ret) {
-		if (cqspi->rx_chan)
-			dma_release_channel(cqspi->rx_chan);
+	pm_runtime_enable(dev);
+
+	if (cqspi->rx_chan) {
+		dma_release_channel(cqspi->rx_chan);
 		goto probe_setup_failed;
 	}
 
@@ -1981,6 +1981,7 @@ static int cqspi_probe(struct platform_device *pdev)
 	return 0;
 probe_setup_failed:
 	cqspi_controller_enable(cqspi, 0);
+	pm_runtime_disable(dev);
 probe_reset_failed:
 	if (cqspi->is_jh7110)
 		cqspi_jh7110_disable_clk(pdev, cqspi);
@@ -1999,7 +2000,8 @@ static void cqspi_remove(struct platform_device *pdev)
 	if (cqspi->rx_chan)
 		dma_release_channel(cqspi->rx_chan);
 
-	clk_disable_unprepare(cqspi->clk);
+	if (pm_runtime_get_sync(&pdev->dev) >= 0)
+		clk_disable(cqspi->clk);
 
 	if (cqspi->is_jh7110)
 		cqspi_jh7110_disable_clk(pdev, cqspi);
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
index 000000000000..035d088d4d33
--- /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");