ARM: dts: qcom: Introduce dtsi for LTE-capable MSM8926

MSM8926, while being 'just' an LTE-capable variant of MSM8226, the dts
needs to slightly change since the modem doesn't use the ext-bhs-reg and
needs mss-supply, therefore it gets a new compatible.

Since we already have two -common.dtsi files which are used on both
APQ8026/MSM8226 and MSM8926 devices, change the setup a bit by removing
the SoC include from those and requiring the device dts to pick the
correct one.

Reviewed-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Luca Weiss <luca@lucaweiss.eu>
Link: https://lore.kernel.org/r/20250217-msm8226-modem-v5-11-2bc74b80e0ae@lucaweiss.eu
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: z3ntu

arch/arm/boot/dts/qcom/msm8926.dtsi

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2025, Luca Weiss <luca@lucaweiss.eu>
+ */
+
+#include "qcom-msm8226.dtsi"
+
+&modem {
+	compatible = "qcom,msm8926-mss-pil";
+	/delete-property/ qcom,ext-bhs-reg;
+};

arch/arm/boot/dts/qcom/qcom-apq8026-samsung-matisse-wifi.dts

@@ -5,6 +5,7 @@
 
 /dts-v1/;
 
+#include "qcom-msm8226.dtsi"
 #include "qcom-msm8226-samsung-matisse-common.dtsi"
 
 / {

arch/arm/boot/dts/qcom/qcom-msm8226-microsoft-common.dtsi

@@ -8,7 +8,11 @@
  * Copyright (c) 2023, Rayyan Ansari <rayyan@ansari.sh>
  */
 
-#include "qcom-msm8226.dtsi"
+/*
+ * The .dts should first include qcom-msm8226.dtsi or msm8926.dtsi depending on
+ * the SoC on the given device.
+ */
+
 #include "pm8226.dtsi"
 #include <dt-bindings/input/input.h>
 

arch/arm/boot/dts/qcom/qcom-msm8226-microsoft-dempsey.dts

@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include "qcom-msm8226.dtsi"
 #include "qcom-msm8226-microsoft-common.dtsi"
 
 / {

arch/arm/boot/dts/qcom/qcom-msm8226-microsoft-makepeace.dts

@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include "qcom-msm8226.dtsi"
 #include "qcom-msm8226-microsoft-common.dtsi"
 
 / {

arch/arm/boot/dts/qcom/qcom-msm8226-microsoft-moneypenny.dts

@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include "qcom-msm8226.dtsi"
 #include "qcom-msm8226-microsoft-common.dtsi"
 
 /* This device has no magnetometer */

arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi

@@ -3,8 +3,12 @@
  * Copyright (c) 2022, Matti Lehtimäki <matti.lehtimaki@gmail.com>
  */
 
+/*
+ * The .dts should first include qcom-msm8226.dtsi or msm8926.dtsi depending on
+ * the SoC on the given device.
+ */
+
 #include <dt-bindings/input/input.h>
-#include "qcom-msm8226.dtsi"
 #include "pm8226.dtsi"
 
 /delete-node/ &adsp_region;

arch/arm/boot/dts/qcom/qcom-msm8926-htc-memul.dts

@@ -5,7 +5,7 @@
 
 /dts-v1/;
 
-#include "qcom-msm8226.dtsi"
+#include "msm8926.dtsi"
 #include "pm8226.dtsi"
 
 /delete-node/ &adsp_region;

arch/arm/boot/dts/qcom/qcom-msm8926-microsoft-superman-lte.dts

@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include "msm8926.dtsi"
 #include "qcom-msm8226-microsoft-common.dtsi"
 
 /* This device has touchscreen on i2c3 instead */

arch/arm/boot/dts/qcom/qcom-msm8926-microsoft-tesla.dts

@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include "msm8926.dtsi"
 #include "qcom-msm8226-microsoft-common.dtsi"
 
 /* This device has touchscreen on i2c1 instead */