linux-kernel - Re: [PATCH 08/11] misc: rp1: RaspberryPi RP1 misc driver

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Message-ID: <ZtcjsHnIb7iuDfhw@apocalypse>
Date: Tue, 3 Sep 2024 16:56:48 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, netdev@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
	Lee Jones <lee@...nel.org>, Stefan Wahren <wahrenst@....net>
Subject: Re: [PATCH 08/11] misc: rp1: RaspberryPi RP1 misc driver

Hi Andrew,

On 16:21 Fri 30 Aug     , Andrew Lunn wrote:
> On Fri, Aug 30, 2024 at 03:49:04PM +0200, Andrea della Porta wrote:
> > Hi Krzysztof,
> > 
> > On 10:38 Wed 21 Aug     , Krzysztof Kozlowski wrote:
> > > On Tue, Aug 20, 2024 at 04:36:10PM +0200, Andrea della Porta wrote:
> > > > The RaspberryPi RP1 is ia PCI multi function device containing
> > > > peripherals ranging from Ethernet to USB controller, I2C, SPI
> > > > and others.
> > > > Implement a bare minimum driver to operate the RP1, leveraging
> > > > actual OF based driver implementations for the on-borad peripherals
> > > > by loading a devicetree overlay during driver probe.
> > > > The peripherals are accessed by mapping MMIO registers starting
> > > > from PCI BAR1 region.
> > > > As a minimum driver, the peripherals will not be added to the
> > > > dtbo here, but in following patches.
> > > > 
> > > > Link: https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
> > > > Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> > > > ---
> > > >  MAINTAINERS                           |   2 +
> > > >  arch/arm64/boot/dts/broadcom/rp1.dtso | 152 ++++++++++++
> > > 
> > > Do not mix DTS with drivers.
> > > 
> > > These MUST be separate.
> > 
> > Separating the dtso from the driver in two different patches would mean
> > that the dtso patch would be ordered before the driver one. This is because
> > the driver embeds the dtbo binary blob inside itself, at build time. So
> > in order to build the driver, the dtso needs to be there also. This is not
> > the standard approach used with 'normal' dtb/dtbo, where the dtb patch is
> > ordered last wrt the driver it refers to.
> > Are you sure you want to proceed in this way?
> 
> It is more about they are logically separate things. The .dtb/dtbo
> describes the hardware. It should be possible to review that as a
> standalone thing. The code them implements the binding. It makes no
> sense to review the code until the binding is correct, because changes
> to the binding will need changes to the code. Hence, we want the
> binding first, then the code which implements it.

Ack.

Cheers,
Andrea

> 
> 	Andrew