samsung-exynos7: new device

New device for all SoCs in the Exynos7 family. Currently tested with:
 - samsung-a2corelte (Galaxy A2 Core)
 - samsung-j6lte (Galaxy J6)
 - samsung-on7xelte (Galaxy J7 Prime)

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7886>

device/testing/device-samsung-exynos7/APKBUILD

@@ -0,0 +1,50 @@
+# Reference: <https://postmarketos.org/devicepkg>
+maintainer="methanal <baclofen@tuta.io>"
+pkgname=device-samsung-exynos7
+pkgdesc="Generic device package for Samsung Exynos7 devices"
+pkgver=1
+pkgrel=0
+url="https://postmarketos.org"
+license="MIT"
+arch="aarch64"
+options="!check !archcheck"
+depends="
+	postmarketos-base
+	systemd-boot
+"
+makedepends="devicepkg-dev"
+source="
+	deviceinfo
+	kernel-cmdline.conf
+	modules-initfs
+"
+subpackages="
+	$pkgname-kernel-stable:kernel_stable
+	$pkgname-kernel-mainline:kernel_mainline
+"
+
+build() {
+	devicepkg_build $startdir $pkgname
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+}
+
+kernel_stable() {
+	pkgdesc="Stable kernel (recommended, best balance between stability and features)"
+	depends="linux-postmarketos-stable"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+kernel_mainline() {
+	pkgdesc="Upstream development kernel (regular breakage, latest features)"
+	depends="linux-postmarketos-mainline"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+sha512sums="
+fe6a0ab189b72a78d4b6bff2b240effa978619a792895c1272643569b8c2968322dda21b513e2047d92136e6005f0066e509196b547da94e471d57b0bf25039c  deviceinfo
+d67b144c72e8d999b0913407a22b5c1e418a263cc87ae0aed0b5d5afbba0e027eb2504b034630cf6011a4f81d3e4a10790b23fce23a6a2b1b02f88271df59374  kernel-cmdline.conf
+f24de3972675d8013be7315229fc8b941801345eba3c632bb96a7206969b0e059b9cda2919df5185814226d4a59c61f88c3ade6d385ffdc01551aae1f300c825  modules-initfs
+"

device/testing/device-samsung-exynos7/deviceinfo

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+# Reference: <https://postmarketos.org/deviceinfo>
+# Please use double quotes only. You can source this file in shell
+# scripts.
+
+deviceinfo_format_version="0"
+deviceinfo_name="Samsung Exynos7-based device"
+deviceinfo_manufacturer="Samsung"
+deviceinfo_codename="samsung-exynos7"
+deviceinfo_year="2015"
+deviceinfo_arch="aarch64"
+
+# Device related
+deviceinfo_drm="true"
+deviceinfo_chassis="handset"
+deviceinfo_external_storage="true"
+
+# Bootloader related
+deviceinfo_boot_filesystem="fat32"
+deviceinfo_flash_method="fastboot"
+deviceinfo_initfs_compression="zstd:fast"

device/testing/device-samsung-exynos7/kernel-cmdline.conf

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+initcall_blacklist=efifb_driver_init

device/testing/device-samsung-exynos7/modules-initfs

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+configfs
+exynosdrm
+panel_samsung_s6e8aa5x01_ams561ra01
+panel_synaptics_tddi
+phy_exynos5_usbdrd
+rmi_i2c
+zinitix