arm64: dts: qcom: Add Microsoft Lumia 950 (Talkman) device tree

Add device tree support for the Microsoft Lumia 950 smartphone.
It is based on msm8992 and supports booting Linux via a custom
EDK2 port.

Currently it supports:
* Screen console via EFIFB
* Booting via EFI_STUB
* SDHCI
* I2C
* PSCI core bringup

Please note that there is an implementation of EL2 startup
on this board, but it requires the user to resign from
PSCI and use spin-table instead. This revision sticks with
PSCI.

Signed-off-by: Konrad Dybcio <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: konradybcio

arch/arm64/boot/dts/qcom/Makefile

@@ -9,6 +9,7 @@ dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-longcheer-l8150.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-samsung-a3u-eur.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-samsung-a5u-eur.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8992-bullhead-rev-101.dtb
+dtb-$(CONFIG_ARCH_QCOM)	+= msm8992-msft-lumia-talkman.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8992-xiaomi-libra.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8994-angler-rev-101.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8994-sony-xperia-kitakami-sumire.dtb

arch/arm64/boot/dts/qcom/msm8992-msft-lumia-talkman.dts

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2020, Konrad Dybcio
+ */
+
+/dts-v1/;
+
+#include "msm8992.dtsi"
+#include "pm8994.dtsi"
+#include "pmi8994.dtsi"
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/gpio-keys.h>
+
+/ {
+	model = "Microsoft Lumia 950";
+	compatible = "microsoft,talkman", "qcom,msm8992";
+
+	/* Most Lumia 950 users use GRUB to load their kernels,
+	 * hence there is no need for msm-id and friends.
+	 */
+
+	/* This enables graphical output via bootloader-enabled display.
+	 * acpi=no is required due to WP platforms having ACPI support, but
+	 * only for Windows-based OSes.
+	 */
+	chosen {
+		bootargs = "earlycon=efifb console=efifb acpi=no";
+
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+	};
+};
+
+&sdhc_1 {
+	status = "okay";
+
+	mmc-hs200-1_8v;
+};