Re: [PATCH RFC 00/18] ARM: Add minimal Raspberry Pi 4 support

From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Eric Anholt <eric@anholt.net>, Stefan Wahren <wahrenst@gmx.net>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	 Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Michael Turquette <mturquette@baylibre.com>,
	 Stephen Boyd <sboyd@kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	 Mark Brown <broonie@kernel.org>
Cc: bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RFC 00/18] ARM: Add minimal Raspberry Pi 4 support
Date: Fri, 19 Jul 2019 15:18:24 +0200	[thread overview]
Message-ID: <3cb7169bf90fdf1388ef89f154225950d51be56f.camel@suse.de> (raw)
In-Reply-To: <877e8fgp1t.fsf@anholt.net>

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On Thu, 2019-07-18 at 11:45 -0700, Eric Anholt wrote:
> Stefan Wahren <wahrenst@gmx.net> writes:
> 
> > This series adds minimal support for the new Raspberry Pi 4, so we are able
> > to login via debug UART.
> > 
> > Patch 1-5:   Prepare platform and DTS for the new SoC BMC2838
> > Patch 6-9:   Enable support for emmc2 on BCM2838
> > Patch 10-14: Enable pinctrl for BCM2838
> > Patch 15:    Enable SPI support for BCM2838
> > Patch 16-18: Add Raspberry Pi 4 DTS support
> > 
> > Unfortunately the Raspberry Pi Foundation didn't released a
> > peripheral documentation for the new SoC yet. So we only have a preliminary
> > datasheet [1] and reduced schematics [2].
> > 
> > This series is marked as RFC because some parts (e.g. pinctrl) are still
> > work in progress.
> > 
> > [1] - 
> > 
https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711/rpi_DATA_2711_1p0_preliminary.pdf
> > [2] - 
> > 
https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_SCH_4b_4p0_reduced.pdf
> > 
> > Discussible things:
> > - SoC compatible BCM2711 (as on the SoC label) vs BCM2838 (existing naming
> > scheme)
> > - ARCH membership ARCH_BCM2835 vs ARCH_BCMSTB
> 
> Thanks for taking this on!
> 
> I would love to see us drop this silly upstream/downstream compatible
> string naming scheme and just use 2711 (or 7211 for modules shared with
> 7211 that were enabled there first).  However, I don't feel that
> strongly about it when I'm not the one doing the work.

In the long run it would have the added benefit of being able to use all the
overlays the RPi Foundation supports. That said I agree with Eric's sentiment.

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