mac80211: read calibration variant from device tree

ath10k and ath11k support reading calibration variants from the device
tree to locate the correct Board Description File (BDF). The ath12k-wsi
binding already describes using qcom,calibration-variant but it is not
implemented in the driver.

Many ath12k designs expose all the radios under a single phy, each of
which typically require a separate BDF. Without this, the radios may not
come up or will not be calibrated correctly.

Fix this by parsing the device tree for the generation-agnostic
qcom,calibration-variant. This allows the driver to properly select,
read and apply the correct BDF.

Additionally, the ath12k-wsi binding documentation describes using the
generation-specific qcom,ath12k-calibration-variant binding as well as
the generation-agnostic qcom,calibration-variant binding to load
board-specific calibration data from the device tree. However, the
driver never implemented either of these.

Given that no devices currently supported use
qcom,ath12k-calibration-variant and the previous patch implements
qcom,calibration-variant, drop the generation-specific version from the
binding to prevent future confusion.

Tested on Askey SBE1V1K.

Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21767
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>

package/kernel/mac80211/patches/ath12k/700-ath12k-read-calibration-variant-from-dt.patch

@@ -0,0 +1,76 @@
+From 81f166ab23dda6cd17b62cbe6d6449c979d3e017 Mon Sep 17 00:00:00 2001
+From: Andrew LaMarche <andrewjlamarche@gmail.com>
+Date: Tue, 30 Jun 2026 00:09:27 +0000
+Subject: [PATCH v2 1/2] wifi: ath12k: support calibration-variant from device
+ tree
+
+ath10k and ath11k support reading calibration variants from the device
+tree to locate the correct Board Description File (BDF). The ath12k-wsi
+binding already describes using qcom,calibration-variant but it is not
+implemented in the driver.
+
+Many ath12k designs expose all the radios under a single phy, each of
+which typically require a separate BDF. Without this, the radios may not
+come up or will not be calibrated correctly.
+
+Fix this by parsing the device tree for the generation-agnostic
+qcom,calibration-variant. This allows the driver to properly select,
+read and apply the correct BDF.
+
+Link: https://lore.kernel.org/linux-wireless/8024a15f-bbab-47ba-bd18-f85eb1fe3dcd@oss.qualcomm.com/T/#mb5c504fb319166fef3df482b0f32afa0efcacc9f
+
+Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
+---
+Changes in v2:
+- Drop ath12k-specific binding qcom,ath12k-calibration-variant in favor
+  of generation agnostic qcom,calibration-variant.
+- Link to v1: https://lore.kernel.org/all/20260131003222.2011259-1-andrewjlamarche@gmail.com
+---
+ drivers/net/wireless/ath/ath12k/core.c | 22 ++++++++++++++++++++++
+ drivers/net/wireless/ath/ath12k/qmi.c  |  4 ++++
+ 2 files changed, 26 insertions(+)
+
+--- a/drivers/net/wireless/ath/ath12k/core.c
++++ b/drivers/net/wireless/ath/ath12k/core.c
+@@ -812,6 +812,28 @@ int ath12k_core_check_smbios(struct ath12k_base *ab)
+ 	return 0;
+ }
+ 
++int ath12k_core_check_dt(struct ath12k_base *ab)
++{
++	size_t max_len = sizeof(ab->qmi.target.bdf_ext);
++	const char *variant = NULL;
++	struct device_node *node;
++
++	node = ab->dev->of_node;
++	if (!node)
++		return -ENOENT;
++
++	of_property_read_string(node, "qcom,calibration-variant",
++			&variant);
++	if (!variant)
++		return -ENODATA;
++
++	if (strscpy(ab->qmi.target.bdf_ext, variant, max_len) < 0)
++		ath12k_dbg(ab, ATH12K_DBG_BOOT,
++				"bdf variant string is longer than the buffer can accommodate (variant: %s)\n", variant);
++
++	return 0;
++}
++
+ static int ath12k_core_soc_create(struct ath12k_base *ab)
+ {
+ 	int ret;
+--- a/drivers/net/wireless/ath/ath12k/qmi.c
++++ b/drivers/net/wireless/ath/ath12k/qmi.c
+@@ -2945,6 +2945,10 @@ int ath12k_qmi_request_target_cap(struct ath12k_base *ab)
+ 	if (r)
+ 		ath12k_dbg(ab, ATH12K_DBG_QMI, "SMBIOS bdf variant name not set.\n");
+ 
++	r = ath12k_core_check_dt(ab);
++	if (r)
++		ath12k_dbg(ab, ATH12K_DBG_QMI, "DT bdf variant name not set.\n");
++
+ 	r = ath12k_acpi_start(ab);
+ 	if (r)
+ 		/* ACPI is optional so continue in case of an error */

target/linux/generic/pending-6.18/796-dt-bindings-wireless-ath12k-drop-qcom-ath12k-cali.patch

@@ -0,0 +1,40 @@
+From 11a10d5cfbd3f364241b0da5dd892026e8bf2946 Mon Sep 17 00:00:00 2001
+From: Andrew LaMarche <andrewjlamarche@gmail.com>
+Date: Tue, 30 Jun 2026 00:27:34 +0000
+Subject: [PATCH v2 2/2] dt-bindings: wireless: ath12k: drop
+ qcom,ath12k-calibration-variant
+
+The ath12k-wsi binding documentation describes using the
+generation-specific qcom,ath12k-calibration-variant binding as well as
+the generation-agnostic qcom,calibration-variant binding to load
+board-specific calibration data from the device tree. However, the
+driver never implemented either of these.
+
+Given that no devices currently supported use
+qcom,ath12k-calibration-variant and the previous patch implements
+qcom,calibration-variant, drop the generation-specific version from the
+binding to prevent future confusion.
+
+Link: https://lore.kernel.org/linux-wireless/8024a15f-bbab-47ba-bd18-f85eb1fe3dcd@oss.qualcomm.com/T/#mce3e7876f06283f4d0c3d61a56378a1fa10b40d3
+
+Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
+---
+ .../devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml  | 7 -------
+ 1 file changed, 7 deletions(-)
+
+--- a/Documentation/devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml
++++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml
+@@ -58,13 +58,6 @@ properties:
+       String to uniquely identify variant of the calibration data for designs
+       with colliding bus and device ids
+ 
+-  qcom,ath12k-calibration-variant:
+-    $ref: /schemas/types.yaml#/definitions/string
+-    deprecated: true
+-    description:
+-      String to uniquely identify variant of the calibration data for designs
+-      with colliding bus and device ids
+-
+   qcom,wsi-controller:
+     $ref: /schemas/types.yaml#/definitions/flag
+     description: