[PATCH v1 2/2] spi: spidev: Add data loopback OF compatible

[Francesco Dolcini]

From: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>

Add "spi-miso-mosi-loopback" OF compatible, that describes a
single wire loopback between the two data signals, MISO and MOSI.

This kind of setup can be used for testing the SPI functionality.

Link: https://lore.kernel.org/all/20260310133254.GA51497@francesco-nb/
Signed-off-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
---
 drivers/spi/spidev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 638221178384..3874fd449580 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -701,6 +701,7 @@ static const struct spi_device_id spidev_spi_ids[] = {
 	{ .name = /* semtech */ "sx1301" },
 	{ .name = /* silabs */ "em3581" },
 	{ .name = /* silabs */ "si3210" },
+	{ .name = "spi-miso-mosi-loopback" },
 	{},
 };
 MODULE_DEVICE_TABLE(spi, spidev_spi_ids);
@@ -735,6 +736,7 @@ static const struct of_device_id spidev_dt_ids[] = {
 	{ .compatible = "semtech,sx1301", .data = &spidev_of_check },
 	{ .compatible = "silabs,em3581", .data = &spidev_of_check },
 	{ .compatible = "silabs,si3210", .data = &spidev_of_check },
+	{ .compatible = "spi-miso-mosi-loopback", .data = &spidev_of_check },
 	{},
 };
 MODULE_DEVICE_TABLE(of, spidev_dt_ids);
-- 
2.47.3