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From: Nikita Travkin <nikita@trvn.ru>
Date: Fri, 15 Mar 2024 18:51:16 +0500
Subject: [PATCH v5 2/4] platform: Add ARM64 platform directory
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Message-Id: <20240315-aspire1-ec-v5-2-f93381deff39@trvn.ru>
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In-Reply-To: <20240315-aspire1-ec-v5-0-f93381deff39@trvn.ru>
To: Hans de Goede <hdegoede@redhat.com>, 
 =?utf-8?q?Ilpo_J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>, 
 Sebastian Reichel <sre@kernel.org>, Rob Herring <robh+dt@kernel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, 
 Conor Dooley <conor+dt@kernel.org>, cros-qcom-dts-watchers@chromium.org, 
 Andy Gross <agross@kernel.org>, Bjorn Andersson <andersson@kernel.org>, 
 Konrad Dybcio <konrad.dybcio@linaro.org>, Rob Herring <robh@kernel.org>, 
 Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-arm-msm@vger.kernel.org, platform-driver-x86@vger.kernel.org, 
 Nikita Travkin <nikita@trvn.ru>

Some ARM64 based laptops and computers require vendor/board specific
drivers for their embedded controllers. Even though usually the most
important functionality of those devices is implemented inside ACPI,
unfortunately Linux doesn't currently have great support for ACPI on
platforms like Qualcomm Snapdragon that are used in most ARM64 laptops
today. Instead Linux relies on Device Tree for Qualcomm based devices
and it's significantly easier to reimplement the EC functionality in
a dedicated driver than to make use of ACPI code.

This commit introduces a new platform/arm64 subdirectory to give a
place to such drivers for EC-like devices.

A new MAINTAINERS entry is added for this directory. Patches to files in
this directory will be taken up by the platform-drivers-x86 team (i.e.
Hans de Goede and Ilpo Järvinen) with additional review from Bryan
O'Donoghue to represent ARM64 maintainers.

Signed-off-by: Nikita Travkin <nikita@trvn.ru>
---
 MAINTAINERS                     | 10 ++++++++++
 drivers/platform/Kconfig        |  2 ++
 drivers/platform/Makefile       |  1 +
 drivers/platform/arm64/Kconfig  | 19 +++++++++++++++++++
 drivers/platform/arm64/Makefile |  6 ++++++
 5 files changed, 38 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 76b3714710c2..186338451099 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3050,6 +3050,16 @@ F:	drivers/mmc/host/sdhci-of-arasan.c
 N:	zynq
 N:	xilinx
 
+ARM64 PLATFORM DRIVERS
+M:	Hans de Goede <hdegoede@redhat.com>
+M:	Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
+R:	Bryan O'Donoghue <bryan.odonoghue@linaro.org>
+L:	platform-driver-x86@vger.kernel.org
+S:	Maintained
+Q:	https://patchwork.kernel.org/project/platform-driver-x86/list/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git
+F:	drivers/platform/arm64/
+
 ARM64 PORT (AARCH64 ARCHITECTURE)
 M:	Catalin Marinas <catalin.marinas@arm.com>
 M:	Will Deacon <will@kernel.org>
diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
index 868b20361769..81a298517df2 100644
--- a/drivers/platform/Kconfig
+++ b/drivers/platform/Kconfig
@@ -14,3 +14,5 @@ source "drivers/platform/olpc/Kconfig"
 source "drivers/platform/surface/Kconfig"
 
 source "drivers/platform/x86/Kconfig"
+
+source "drivers/platform/arm64/Kconfig"
diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile
index 41640172975a..fbbe4f77aa5d 100644
--- a/drivers/platform/Makefile
+++ b/drivers/platform/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_OLPC_EC)		+= olpc/
 obj-$(CONFIG_GOLDFISH)		+= goldfish/
 obj-$(CONFIG_CHROME_PLATFORMS)	+= chrome/
 obj-$(CONFIG_SURFACE_PLATFORMS)	+= surface/
+obj-$(CONFIG_ARM64)		+= arm64/
diff --git a/drivers/platform/arm64/Kconfig b/drivers/platform/arm64/Kconfig
new file mode 100644
index 000000000000..644b83ede093
--- /dev/null
+++ b/drivers/platform/arm64/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# EC-like Drivers for aarch64 based devices.
+#
+
+menuconfig ARM64_PLATFORM_DEVICES
+	bool "ARM64 Platform-Specific Device Drivers"
+	depends on ARM64 || COMPILE_TEST
+	default y
+	help
+	  Say Y here to get to see options for platform-specific device drivers
+	  for arm64 based devices, primarily EC-like device drivers.
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if ARM64_PLATFORM_DEVICES
+
+endif # ARM64_PLATFORM_DEVICES
diff --git a/drivers/platform/arm64/Makefile b/drivers/platform/arm64/Makefile
new file mode 100644
index 000000000000..f91cdc7155e2
--- /dev/null
+++ b/drivers/platform/arm64/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for linux/drivers/platform/arm64
+#
+# This dir should only include drivers for EC-like devices.
+#

-- 
2.44.0