From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
This is a preparation for the next commit adding support for register
read and write functions on AD7606.
Since sometimes a bus will be used, it has been agreed during ad3552's
driver implementation that the device's driver bus is the backend, whose
device node will be a child node.
To provide the special callbacks for setting the register, axi-adc needs
to pass them to the child device's driver through platform data.
Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
---
drivers/iio/adc/ad7606_bus_iface.h | 16 ++++++++++
drivers/iio/adc/adi-axi-adc.c | 65 ++++++++++++++++++++++++++++++++++++++
2 files changed, 81 insertions(+)
diff --git a/drivers/iio/adc/ad7606_bus_iface.h b/drivers/iio/adc/ad7606_bus_iface.h
new file mode 100644
index 000000000000..f2c979a9b7f3
--- /dev/null
+++ b/drivers/iio/adc/ad7606_bus_iface.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2010-2024 Analog Devices Inc.
+ * Copyright (c) 2025 Baylibre, SAS
+ */
+#ifndef __LINUX_PLATFORM_DATA_AD7606_H__
+#define __LINUX_PLATFORM_DATA_AD7606_H__
+
+struct iio_backend;
+
+struct ad7606_platform_data {
+ int (*bus_reg_read)(struct iio_backend *back, u32 reg, u32 *val);
+ int (*bus_reg_write)(struct iio_backend *back, u32 reg, u32 val);
+};
+
+#endif /* __LINUX_PLATFORM_DATA_AD7606_H__ */
diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index b38e8a27af94..3e1a997ace76 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -334,6 +334,36 @@ static const struct regmap_config axi_adc_regmap_config = {
.reg_stride = 4,
};
+static void axi_adc_child_remove(void *data)
+{
+ platform_device_unregister(data);
+}
+
+static int axi_adc_create_platform_device(struct adi_axi_adc_state *st,
+ struct fwnode_handle *child)
+{
+ struct platform_device_info pi = {
+ .parent = st->dev,
+ .name = fwnode_get_name(child),
+ .id = PLATFORM_DEVID_AUTO,
+ .fwnode = child,
+ .data = st->info->pdata,
+ .size_data = st->info->pdata_sz,
+ };
+ struct platform_device *pdev;
+ int ret;
+
+ pdev = platform_device_register_full(&pi);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ ret = devm_add_action_or_reset(st->dev, axi_adc_child_remove, pdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
static const struct iio_backend_ops adi_axi_adc_ops = {
.enable = axi_adc_enable,
.disable = axi_adc_disable,
@@ -417,6 +447,28 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, ret,
"failed to register iio backend\n");
+ device_for_each_child_node_scoped(&pdev->dev, child) {
+ int val;
+
+ if (!st->info->has_child_nodes)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "invalid fdt axi-dac compatible.");
+
+ /* Processing only reg 0 node */
+ ret = fwnode_property_read_u32(child, "reg", &val);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "invalid reg property.");
+ if (val != 0)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "invalid node address.");
+
+ ret = axi_adc_create_platform_device(st, child);
+ if (ret)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "cannot create device.");
+ }
+
dev_info(&pdev->dev, "AXI ADC IP core (%d.%.2d.%c) probed\n",
ADI_AXI_PCORE_VER_MAJOR(ver),
ADI_AXI_PCORE_VER_MINOR(ver),
@@ -430,6 +482,19 @@ static const struct axi_adc_info adc_generic = {
.backend_info = &adi_axi_adc_generic,
};
+static const struct ad7606_platform_data ad7606_pdata = {
+ .bus_reg_read = ad7606_bus_reg_read,
+ .bus_reg_write = ad7606_bus_reg_write,
+};
+
+static const struct axi_adc_info adc_ad7606 = {
+ .version = ADI_AXI_PCORE_VER(10, 0, 'a'),
+ .backend_info = &adi_axi_adc_generic,
+ .pdata = &ad7606_pdata,
+ .pdata_sz = sizeof(ad7606_pdata),
+ .has_child_nodes = true,
+};
+
/* Match table for of_platform binding */
static const struct of_device_id adi_axi_adc_of_match[] = {
{ .compatible = "adi,axi-adc-10.0.a", .data = &adc_generic },
--
2.47.0
