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iio: dac: adi-axi-dac: add registering of child fdt node

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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.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20241028-wip-bl-ad3552r-axi-v0-iio-testing-v9-8-f6960b4f9719@kernel-space.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Angelo Dureghello 2024-10-28 22:45:35 +01:00 committed by Jonathan Cameron
parent 0b4d9fe58b
commit 248da097f6
1 changed files with 56 additions and 0 deletions
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56
drivers/iio/dac/adi-axi-dac.c
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@ -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 {
@ -711,6 +714,36 @@ 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,
.bus_sample_data_clock_hz = st->dac_clk_rate,
};
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,
@ -852,6 +885,28 @@ static int axi_dac_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_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),
@ -869,6 +924,7 @@ 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[] = {