linux-kernel - Re: [PATCH v3 09/12] arm64: dts: rp1: Add support for RaspberryPi's RP1 device

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Message-ID: <ZythBBrjwxxCnzCZ@apocalypse>
Date: Wed, 6 Nov 2024 13:28:52 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: Stanimir Varbanov <svarbanov@...e.de>,
	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>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczynski <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Saravana Kannan <saravanak@...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-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Stefan Wahren <wahrenst@....net>,
	Herve Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v3 09/12] arm64: dts: rp1: Add support for RaspberryPi's
 RP1 device

Hi Stan,

On 15:31 Tue 05 Nov     , Andrea della Porta wrote:
> Hi Stan,
> 
> On 15:29 Mon 04 Nov     , Stanimir Varbanov wrote:
> > Hi Andrea,
> >

...

> > shouldn't this be:
> > 
> > 	rp1_clocks: clocks@...00 {
> > 		reg = <0x00 0x00018000 0x0 0x10038>;
> > 		...
> > 	}
> > 
> > ?
> > 
> > And for other nodes too...
> 
> For that to be @18000 instead of @c040018000, you should also change
> the "ranges" entry in pci-ep-bus node, as follows:
> 
> ranges = <0x00 0x00018000	//This was: 0xc0 0x40000000
>           0x01 0x00 0x00000000
>           0x00 0x00400000>;
> 
> which is of course feasible, but I prefer to use addresses that 
> resemble (at least to some extent) the ones in RP1 docs.
> 
> Many thanks,
> Andrea

Sorry, this should be like this 

ranges = <0x00 0x00000000	//This was: 0xc0 0x40000000
          0x01 0x00 0x00000000
          0x00 0x00400000>;

i.e. the child address in the range should be 0 and not 0x18000.
Anyway you got the point: in theory we can replace that address
with whatever placeholder we want and from a functional perspective,
it will work, as long as you change all the relevant mappings.
After some brainstorming we've decided to choose a simpler scheme
that will resemble more the internal address described in the RP1
reference manual. 0xC040000000 will become 0x40000000.

Many thanks,
Andrea

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