linux-kernel - Re: [PATCH v5 2/4] platform: Add ARM64 platform directory

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Date: Mon, 18 Mar 2024 13:31:40 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Nikita Travkin <nikita@...n.ru>
cc: Hans de Goede <hdegoede@...hat.com>, Sebastian Reichel <sre@...nel.org>, 
    Rob Herring <robh+dt@...nel.org>, 
    Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
    Conor Dooley <conor+dt@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
    Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
    Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
    Bryan O'Donoghue <bryan.odonoghue@...aro.org>, devicetree@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>, linux-arm-msm@...r.kernel.org, 
    platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v5 2/4] platform: Add ARM64 platform directory

On Fri, 15 Mar 2024, Nikita Travkin wrote:

> 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@...n.ru>

Acked-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

And big thanks for Bryan for volunteering!

-- 
 i.

> ---
>  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@...hat.com>
> +M:	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> +R:	Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> +L:	platform-driver-x86@...r.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@....com>
>  M:	Will Deacon <will@...nel.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.
> +#
> 
>