linux-kernel - [PATCH v9 8/8] iio: dac: adi-axi-dac: add registering of child fdt node

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Message-Id: <20241028-wip-bl-ad3552r-axi-v0-iio-testing-v9-8-f6960b4f9719@kernel-space.org>
Date: Mon, 28 Oct 2024 22:45:35 +0100
From: Angelo Dureghello <angelo@...nel-space.org>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Olivier Moysan <olivier.moysan@...s.st.com>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, dlechner@...libre.com, 
 Mark Brown <broonie@...nel.org>, 
 Angelo Dureghello <angelo@...nel-space.org>, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v9 8/8] iio: dac: adi-axi-dac: add registering of child fdt
 node

From: Angelo Dureghello <adureghello@...libre.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.

Reviewed-by: Nuno Sa <nuno.sa@...log.com>
Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 drivers/iio/dac/adi-axi-dac.c | 56 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index 155d04ca2315..a49d233c28c0 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 {
@@ -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[] = {

-- 
2.45.0.rc1