linux-kernel - Re: [PATCH 3/6] arm64: dts: broadcom: Add support for BCM2712

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Message-ID: <CAMEGJJ1xGNx0r1T_-WyoAnFtZZxxWfxudVorBu=ZVWQFnKwDEQ@mail.gmail.com>
Date: Mon, 15 Apr 2024 11:43:36 +0100
From: Phil Elwell <phil@...pberrypi.com>
To: Stefan Wahren <wahrenst@....net>
Cc: Andrea della Porta <andrea.porta@...e.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Florian Fainelli <florian.fainelli@...adcom.com>, Linus Walleij <linus.walleij@...aro.org>, 
	Jonathan Bell <jonathan@...pberrypi.com>, Ulf Hansson <ulf.hansson@...aro.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, linux-kernel@...r.kernel.org, 
	Al Cooper <alcooperx@...il.com>, linux-mmc@...r.kernel.org, 
	Kamal Dasu <kamal.dasu@...adcom.com>, linux-arm-kernel@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 3/6] arm64: dts: broadcom: Add support for BCM2712

Stefan,

On Mon, 15 Apr 2024 at 10:06, Stefan Wahren <wahrenst@....net> wrote:
>
> Hi Phil,
>
> Am 15.04.24 um 10:52 schrieb Phil Elwell:
> > Stefan,
> >
> >
> > On Mon, 15 Apr 2024 at 09:20, Stefan Wahren <wahrenst@....net> wrote:
> >> Hi Phil,
> >>
> >> Am 14.04.24 um 00:14 schrieb Andrea della Porta:
> >>> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> >>> ---
> >>>    arch/arm64/boot/dts/broadcom/Makefile         |   1 +
> >>>    .../boot/dts/broadcom/bcm2712-rpi-5-b.dts     | 313 +++++++
> >>>    arch/arm64/boot/dts/broadcom/bcm2712-rpi.dtsi |  81 ++
> >>>    arch/arm64/boot/dts/broadcom/bcm2712.dtsi     | 841 ++++++++++++++++++
> >>>    4 files changed, 1236 insertions(+)
> >>>    create mode 100644 arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
> >>>    create mode 100644 arch/arm64/boot/dts/broadcom/bcm2712-rpi.dtsi
> >>>    create mode 100644 arch/arm64/boot/dts/broadcom/bcm2712.dtsi
> >>>
> >>> diff --git a/arch/arm64/boot/dts/broadcom/Makefile b/arch/arm64/boot/dts/broadcom/Makefile
> >>> index 8b4591ddd27c..92565e9781ad 100644
> >>> --- a/arch/arm64/boot/dts/broadcom/Makefile
> >>> +++ b/arch/arm64/boot/dts/broadcom/Makefile
> >>> @@ -6,6 +6,7 @@ DTC_FLAGS := -@
> >>>    dtb-$(CONFIG_ARCH_BCM2835) += bcm2711-rpi-400.dtb \
> >>>                              bcm2711-rpi-4-b.dtb \
> >>>                              bcm2711-rpi-cm4-io.dtb \
> >>> +                           bcm2712-rpi-5-b.dtb \
> >>>                              bcm2837-rpi-3-a-plus.dtb \
> >>>                              bcm2837-rpi-3-b.dtb \
> >>>                              bcm2837-rpi-3-b-plus.dtb \
> >>> diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
> >>> new file mode 100644
> >>> index 000000000000..2ce180a54e5b
> >>> --- /dev/null
> >>> +++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b.dts
> >>> @@ -0,0 +1,313 @@
> >>> +// SPDX-License-Identifier: GPL-2.0
> >>> +/dts-v1/;
> >>> +
> >>> +#include <dt-bindings/gpio/gpio.h>
> >>> +#include <dt-bindings/interrupt-controller/irq.h>
> >>> +#include <dt-bindings/pwm/pwm.h>
> >>> +#include <dt-bindings/reset/raspberrypi,firmware-reset.h>
> >>> +
> >>> +#define spi0 _spi0
> >>> +#define uart0 _uart0
> >>> +
> >>> +#include "bcm2712.dtsi"
> >>> +
> >>> +#undef spi0
> >>> +#undef uart0
> >>> +
> >>> +/ {
> >>> +     compatible = "raspberrypi,5-model-b", "brcm,bcm2712";
> >>> +     model = "Raspberry Pi 5";
> >>> +
> >>>
> >> according to this downstream commit [1] it's just called "Raspberry Pi
> >> 5" without Model B, but the filename and the compatible says something
> >> different. Is there still a chance to get this consistent or is it too
> >> late because the firmware expect the compatible?
> >>
> >> [1] -
> >> https://github.com/raspberrypi/linux/commit/99e359d2f2da2c820fd2a30b1ad08b32c9549adb
> > Nothing cares about the compatible string, but the product name was
> > changed too late for the firmware, which expects the current DTB file
> > name.
> should i send a pull request to address the compatible? This would avoid
> a little bit confusion in the upstreaming process, because
> devicetree/bindings/arm/bcm/bcm2835.yaml needs to be updated as well.

You think it is better to have the compatible string different to the
file name, rather than just the human-readable model string being
different? I don't agree.

Phil