[PATCH v7 8/8] iio: dac: adi-axi-dac: add registering of child fdt node

Angelo Dureghello
2024-10-21T12:41:47Z

From: Angelo Dureghello <adureghello@baylibre.com>

Change to obtain the fdt use case as reported in the
adi,ad3552r.yaml file in this patchset.

The DAC device is defined as a child node of the backend.
Registering the child fdt node as a platform devices.

Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
---
drivers/iio/dac/adi-axi-dac.c | 53 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)

diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index 9d6809fe7a67..7f7ef3e219ba 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -29,6 +29,8 @@
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>

+#include "ad3552r-hs.h"
+
/*
* Register definitions:
* https://wiki.analog.com/resources/fpga/docs/axi_dac_ip#register_map
@@ -97,6 +99,7 @@ struct axi_dac_info {
unsigned int version;
const struct iio_backend_info *backend_info;
bool has_dac_clk;
+ bool has_child_nodes;
};

struct axi_dac_state {
@@ -723,6 +726,35 @@ static int axi_dac_bus_reg_read(struct iio_backend *back, u32 reg, u32 *val,
return regmap_read(st->regmap, AXI_DAC_CUSTOM_RD_REG, val);
}

+static void axi_dac_child_remove(void *data)
+{
+ platform_device_unregister(data);
+}
+
+static int axi_dac_create_platform_device(struct axi_dac_state *st,
+ struct fwnode_handle *child)
+{
+ struct ad3552r_hs_platform_data pdata = {
+ .bus_reg_read = axi_dac_bus_reg_read,
+ .bus_reg_write = axi_dac_bus_reg_write,
+ };
+ struct platform_device_info pi = {
+ .parent = st->dev,
+ .name = fwnode_get_name(child),
+ .id = PLATFORM_DEVID_AUTO,
+ .fwnode = child,
+ .data = &pdata,
+ .size_data = sizeof(pdata),
+ };
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_full(&pi);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ return devm_add_action_or_reset(st->dev, axi_dac_child_remove, pdev);
+}
+
static const struct iio_backend_ops axi_dac_generic_ops = {
.enable = axi_dac_enable,
.disable = axi_dac_disable,
@@ -865,6 +897,26 @@ static int axi_dac_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, ret,
"failed to register iio backend\n");

+ if (st->info->has_child_nodes) {
+ device_for_each_child_node_scoped(&pdev->dev, child) {
+ int val;
+
+ /* 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_dac_create_platform_device(st, child);
+ if (ret)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "cannot create device.");
+ }
+ }
+
dev_info(&pdev->dev, "AXI DAC IP core (%d.%.2d.%c) probed\n",
ADI_AXI_PCORE_VER_MAJOR(ver),
ADI_AXI_PCORE_VER_MINOR(ver),
@@ -882,6 +934,7 @@ static const struct axi_dac_info dac_ad3552r = {
.version = ADI_AXI_PCORE_VER(9, 1, 'b'),
.backend_info = &axi_ad3552r,
.has_dac_clk = true,
+ .has_child_nodes = true,
};

static const struct of_device_id axi_dac_of_match[] = {

--
2.45.0.rc1