FAILED: patch "[PATCH] iio: temperature: ltc2983: Fix n_wires default bypassing" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 434c150752675f44dc52c384a7fa22e5176bc35a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026071314-ruckus-bacterium-2228@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 434c150752675f44dc52c384a7fa22e5176bc35a Mon Sep 17 00:00:00 2001
From: Liviu Stan <[email protected]>
Date: Mon, 25 May 2026 19:39:28 +0300
Subject: [PATCH] iio: temperature: ltc2983: Fix n_wires default bypassing
rotation check

When adi,number-of-wires is absent, n_wires is left at 0. The binding documents a default of 2 wires, matching the hardware default. However the current-rotate validation checks n_wires == 2 || n_wires == 3, so with n_wires = 0 the guard is bypassed and adi,current-rotate is accepted for a 2-wire RTD.

Initialize n_wires = 2 to match the binding default and ensure the rotation check fires correctly when the property is absent.

index 38e6f8dfd3b8..1f835e326b93 100644
@@ -741,7 +741,7 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 	struct ltc2983_rtd *rtd;
 	int ret = 0;
 	struct device *dev = &st->spi->dev;
-	u32 excitation_current = 0, n_wires = 0;
+	u32 excitation_current = 0, n_wires = 2;
 
 	rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
 	if (!rtd)

When adi,number-of-wires is absent, n_wires is left at 0. The binding documents a default of 2 wires, matching the hardware default. However the current-rotate validation checks n_wires == 2 || n_wires == 3, so with n_wires = 0 the guard is bypassed and adi,current-rotate is accepted for a 2-wire RTD.

Initialize n_wires = 2 to match the binding default and ensure the rotation check fires correctly when the property is absent.

---
 drivers/iio/temperature/ltc2983.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index b2ae2d2c7eef..2fafd9040ad8 100644
@@ -697,7 +697,7 @@ static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
 	int ret = 0;
 	struct device *dev = &st->spi->dev;
 	struct device_node *phandle;
-	u32 excitation_current = 0, n_wires = 0;
+	u32 excitation_current = 0, n_wires = 2;
 
 	rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
 	if (!rtd)

2.43.0

Queued for 5.15, thanks.

Thanks,
Sasha