[PATCH v2 1/2] wifi: ath12k: support calibration-variant from device tree

[PATCH v2 1/2] wifi: ath12k: support calibration-variant from device tree

[Andrew LaMarche]

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.

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(+)

diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
index 742d4fd1b598..52c28864c63c 100644
--- 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;
diff --git a/drivers/net/wireless/ath/ath12k/qmi.c b/drivers/net/wireless/ath/ath12k/qmi.c
index fd762b5d7bb5..3cf39ae06fd3 100644
--- 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 */
-- 
2.43.0

[PATCH v2 2/2] dt-bindings: wireless: ath12k: drop qcom,ath12k-calibration-variant

[Andrew LaMarche]

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.

Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
---
 .../devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml  | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml b/Documentation/devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml
index 589960144fe1..fa64c8aa56f5 100644
--- 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:
-- 
2.43.0

Re: [PATCH v2 2/2] dt-bindings: wireless: ath12k: drop qcom,ath12k-calibration-variant

[Krzysztof Kozlowski]

On 30/06/2026 03:14, Andrew LaMarche wrote:
> 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.

But DTS did, which I removed. Probably this could be mentioned if it is
relevant.

Anyway:
Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC. It might happen, that command when run on an older
kernel, gives you outdated entries. Therefore please be sure you base
your patches on recent Linux kernel.

Tools like b4 or scripts/get_maintainer.pl provide you proper list of
people, so fix your workflow. Tools might also fail if you work on some
ancient tree (don't, instead use mainline) or work on fork of kernel
(don't, instead use mainline). Just use b4 and everything should be
fine, although remember about `b4 prep --auto-to-cc` if you added new
patches to the patchset.

You missed at least devicetree list (maybe more), so this won't be
tested by automated tooling. Performing review on untested code might be
a waste of time.

Please kindly resend and include all necessary To/Cc entries.




Best regards,
Krzysztof

[PATCH v2 2/2] dt-bindings: wireless: ath12k: drop qcom,ath12k-calibration-variant

[Andrew LaMarche]

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.

Signed-off-by: Andrew LaMarche <andrewjlamarche@gmail.com>
---
 .../devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml  | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml b/Documentation/devicetree/bindings/net/wireless/qcom,ath12k-wsi.yaml
index 589960144fe1..fa64c8aa56f5 100644
--- 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:
-- 
2.43.0