linux-kernel - [PATCH 03/13] spi: do not attempt to register DT nodes without @ in name

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Date: Wed, 10 Jan 2024 13:49:44 -0600
From: David Lechner <dlechner@...libre.com>
To: Mark Brown <broonie@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Frank Rowand <frowand.list@...il.com>
Cc: David Lechner <dlechner@...libre.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	linux-spi@...r.kernel.org,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 03/13] spi: do not attempt to register DT nodes without @ in name

In the DT bindings for SPI devices, it is specified that peripheral
nodes have the @ character in the node name. A SPI controller may need
to create bindings with child nodes that are not peripherals. For
example, the AXI SPI Engine bindings will use an "offloads" child node
to describe what is connected to the offload interfaces of the SPI
controller.

Without this change, the SPI controller would attempt to register all
child nodes as SPI devices. After this change, only nodes with '@' in
the name will be registered as SPI devices.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/spi/spi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index f1d66b5d5491..5be5e654284c 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2379,7 +2379,9 @@ static void of_register_spi_devices(struct spi_controller *ctlr)
 	struct device_node *nc;
 
 	for_each_available_child_of_node(ctlr->dev.of_node, nc) {
-		if (of_node_test_and_set_flag(nc, OF_POPULATED))
+		/* Only nodes with '@' in the name are peripheral nodes. */
+		if (of_node_test_and_set_flag(nc, OF_POPULATED) ||
+		    !strchr(kbasename(nc->full_name), '@'))
 			continue;
 		spi = of_register_spi_device(ctlr, nc);
 		if (IS_ERR(spi)) {

-- 
2.43.0