linux-kernel - [PATCH v2] media: i2c: thp7312: use fwnode_for_each_child

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Message-ID: <Z90qM33DvkTMGg_x@mva-rohm>
Date: Fri, 21 Mar 2025 10:58:27 +0200
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Paul Elder <paul.elder@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: [PATCH v2] media: i2c: thp7312: use fwnode_for_each_child_node()

When fwnode_for_each_available_child_node() is used on the device-tree
backed systems, it renders to same operation as the
fwnode_for_each_child_node(), because the fwnode_for_each_child_node()
does only iterate through those device-tree nodes which are available.

The thp7312 uses the fwnode_for_each_available_child_node() to look up
and handle nodes with specific names. This means the code is used only
on the device-tree backed systems because the node names have little
meaning on ACPI or swnode backed systems.

Use the fwnode_for_each_child_node() instead of the
fwnode_for_each_available_child_node() In order to make it clearly
visible that the 'availability' of the nodes does not need to be
explicitly considered here. This will also make it clearly visible that
the code in this driver is suitable candidate to be converted to use the
new fwnode_for_each_named_child_node()[2] when it gets merged.

[1]:
https://lore.kernel.org/all/Z9rhfJUlCbi7kA2m@kekkonen.localdomain/
[2]:
https://lore.kernel.org/all/9c3880f74476436f39d796b5c10c540ae50b722c.1742225817.git.mazziesaccount@gmail.com/

Suggested-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>

---
Revision history:
v1 => v2:
 - rephrase the commit message to not claim the 'availability' has no
   well defined meaning on the DT backed systems. Instead, explain that
   the fwnode_for_each_available_child_node() only iterates through the
   available nodes on the DT backed systems and is thus functionally
   equivalent to the fwnode_for_each_child_node().

NOTE: The change is compile tested only! Proper testing and reviewing is
highly appreciated (as always).
---
 drivers/media/i2c/thp7312.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/i2c/thp7312.c b/drivers/media/i2c/thp7312.c
index 8852c56431fe..4b66f64f8d65 100644
--- a/drivers/media/i2c/thp7312.c
+++ b/drivers/media/i2c/thp7312.c
@@ -2067,7 +2067,7 @@ static int thp7312_parse_dt(struct thp7312_device *thp7312)
 		return -EINVAL;
 	}

-	fwnode_for_each_available_child_node(sensors, node) {
+	fwnode_for_each_child_node(sensors, node) {
 		if (fwnode_name_eq(node, "sensor")) {
 			if (!thp7312_sensor_parse_dt(thp7312, node))
 				num_sensors++;

base-commit: 7eb172143d5508b4da468ed59ee857c6e5e01da6
-- 
2.48.1

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