linux-kernel - [PATCH v2 4/9] iio: backend adi-axi-dac: add registering of child fdt node

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Message-Id: <20240905-wip-bl-ad3552r-axi-v0-iio-testing-v2-4-87d669674c00@baylibre.com>
Date: Thu, 05 Sep 2024 17:17:34 +0200
From: Angelo Dureghello <adureghello@...libre.com>
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, David Lechner <dlechner@...libre.com>, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v2 4/9] iio: backend 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, with the DAC device that
is actually using the backend set as a child node of the backend.

To obtain this, registering all the child fdt nodes as platform
devices.

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
Co-developed-by: David Lechner <dlechner@...libre.com>
Co-developed-by: Nuno Sá <nuno.sa@...log.com>
---
 drivers/iio/dac/adi-axi-dac.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index cc31e1dcd1df..e883cd557b6a 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -783,6 +783,7 @@ static int axi_dac_probe(struct platform_device *pdev)
 {
 	struct axi_dac_state *st;
 	const struct axi_dac_info *info;
+	struct platform_device *child_pdev;
 	void __iomem *base;
 	unsigned int ver;
 	struct clk *clk;
@@ -862,6 +863,20 @@ 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) {
+		struct platform_device_info pi;
+
+		memset(&pi, 0, sizeof(pi));
+
+		pi.name = fwnode_get_name(child);
+		pi.id = PLATFORM_DEVID_AUTO;
+		pi.fwnode = child;
+
+		child_pdev = platform_device_register_full(&pi);
+		if (IS_ERR(child_pdev))
+			return PTR_ERR(child_pdev);
+	}
+
 	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),

-- 
2.45.0.rc1