linux-kernel - Re: [RFT PATCH v3 27/27] arm64: apple: Add initial Apple Mac mini (M1, 2020) devicetree

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Message-ID: <e45c15ae-ee81-139c-5da1-a6759e39fd71@canonical.com>
Date:   Fri, 5 Mar 2021 12:03:20 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Hector Martin <marcan@...can.st>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Marc Zyngier <maz@...nel.org>, Rob Herring <robh@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH v3 27/27] arm64: apple: Add initial Apple Mac mini
 (M1, 2020) devicetree

On 04/03/2021 22:39, Hector Martin wrote:
> This currently supports:
> 
> * SMP (via spin-tables)
> * AIC IRQs
> * Serial (with earlycon)
> * Framebuffer
> 
> A number of properties are dynamic, and based on system firmware
> decisions that vary from version to version. These are expected
> to be filled in by the loader.
> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  MAINTAINERS                              |   1 +
>  arch/arm64/boot/dts/Makefile             |   1 +
>  arch/arm64/boot/dts/apple/Makefile       |   2 +
>  arch/arm64/boot/dts/apple/t8103-j274.dts |  45 ++++++++
>  arch/arm64/boot/dts/apple/t8103.dtsi     | 135 +++++++++++++++++++++++
>  5 files changed, 184 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/apple/Makefile
>  create mode 100644 arch/arm64/boot/dts/apple/t8103-j274.dts
>  create mode 100644 arch/arm64/boot/dts/apple/t8103.dtsi
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 28bd46f4f7a7..d5e4d93a536a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1647,6 +1647,7 @@ C:	irc://chat.freenode.net/asahi-dev
>  T:	git https://github.com/AsahiLinux/linux.git
>  F:	Documentation/devicetree/bindings/arm/apple.yaml
>  F:	Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
> +F:	arch/arm64/boot/dts/apple/
>  F:	arch/arm64/include/asm/sysreg_apple.h
>  F:	drivers/irqchip/irq-apple-aic.c
>  F:	include/dt-bindings/interrupt-controller/apple-aic.h
> diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
> index f1173cd93594..639e01a4d855 100644
> --- a/arch/arm64/boot/dts/Makefile
> +++ b/arch/arm64/boot/dts/Makefile
> @@ -6,6 +6,7 @@ subdir-y += amazon
>  subdir-y += amd
>  subdir-y += amlogic
>  subdir-y += apm
> +subdir-y += apple
>  subdir-y += arm
>  subdir-y += bitmain
>  subdir-y += broadcom
> diff --git a/arch/arm64/boot/dts/apple/Makefile b/arch/arm64/boot/dts/apple/Makefile
> new file mode 100644
> index 000000000000..cbbd701ebf05
> --- /dev/null
> +++ b/arch/arm64/boot/dts/apple/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +dtb-$(CONFIG_ARCH_APPLE) += t8103-j274.dtb
> diff --git a/arch/arm64/boot/dts/apple/t8103-j274.dts b/arch/arm64/boot/dts/apple/t8103-j274.dts
> new file mode 100644
> index 000000000000..8afc2ed70361
> --- /dev/null
> +++ b/arch/arm64/boot/dts/apple/t8103-j274.dts
> @@ -0,0 +1,45 @@
> +// SPDX-License-Identifier: GPL-2.0+ OR MIT
> +/*
> + * Apple Mac mini (M1, 2020)
> + *
> + * target-type: J174
> + *
> + * Copyright The Asahi Linux Contributors
> + */
> +
> +/dts-v1/;
> +
> +#include "t8103.dtsi"
> +
> +/ {
> +	compatible = "apple,j274", "apple,t8103", "apple,arm-platform";
> +	model = "Apple Mac mini (M1, 2020)";
> +
> +	aliases {
> +		serial0 = &serial0;
> +	};
> +
> +	chosen {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		stdout-path = "serial0";
> +
> +		framebuffer0: framebuffer@0 {
> +			compatible = "apple,simple-framebuffer", "simple-framebuffer";
> +			reg = <0 0 0 0>; /* To be filled by loader */
> +			/* Format properties will be added by loader */
> +			status = "disabled";
> +		};
> +	};
> +
> +	memory@...000000 {
> +		device_type = "memory";
> +		reg = <0x8 0 0x2 0>; /* To be filled by loader */

Shouldn't this be 0x800000000 with ~0x80000000 length (or whatever is
more common)? Or did I miss some ranges?

Best regards,
Krzysztof