linux-kernel - Re: [PATCH 11/11] arm64: dts: rp1: Add support for MACB contained in RP1

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Message-ID: <ZszjFYkoSCfwxUOk@apocalypse>
Date: Mon, 26 Aug 2024 22:18:29 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	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>,
	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>, Andrew Lunn <andrew@...n.ch>,
	Stefan Wahren <wahrenst@....net>
Subject: Re: [PATCH 11/11] arm64: dts: rp1: Add support for MACB contained in
 RP1

Hi Florian,

On 10:02 Wed 21 Aug     , Florian Fainelli wrote:
> On 8/20/24 07:36, Andrea della Porta wrote:
> > RaspberryPi RP1 is multi function PCI endpoint device that
> > exposes several subperipherals via PCI BAR.
> > Add an ethernet node for Cadence MACB to the RP1 dtso
> > 
> > Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> > ---
> >   arch/arm64/boot/dts/broadcom/rp1.dtso | 23 +++++++++++++++++++++++
> >   1 file changed, 23 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/broadcom/rp1.dtso b/arch/arm64/boot/dts/broadcom/rp1.dtso
> > index d80178a278ee..b40e203c28d5 100644
> > --- a/arch/arm64/boot/dts/broadcom/rp1.dtso
> > +++ b/arch/arm64/boot/dts/broadcom/rp1.dtso
> > @@ -78,6 +78,29 @@ rp1_clocks: clocks@...0018000 {
> >   							       <50000000>;   // RP1_CLK_ETH_TSU
> >   				};
> > +				rp1_eth: ethernet@...0100000 {
> > +					reg = <0xc0 0x40100000  0x0 0x4000>;
> > +					compatible = "cdns,macb";
> > +					#address-cells = <1>;
> > +					#size-cells = <0>;
> > +					interrupts = <RP1_INT_ETH IRQ_TYPE_LEVEL_HIGH>;
> > +					clocks = <&macb_pclk &macb_hclk &rp1_clocks RP1_CLK_ETH_TSU>;
> > +					clock-names = "pclk", "hclk", "tsu_clk";
> > +					phy-mode = "rgmii-id";
> > +					cdns,aw2w-max-pipe = /bits/ 8 <8>;
> > +					cdns,ar2r-max-pipe = /bits/ 8 <8>;
> > +					cdns,use-aw2b-fill;
> > +					local-mac-address = [00 00 00 00 00 00];
> > +					phy-handle = <&phy1>;
> > +					phy-reset-gpios = <&rp1_gpio 32 GPIO_ACTIVE_LOW>;
> > +					phy-reset-duration = <5>;
> > +
> > +					phy1: ethernet-phy@1 {
> > +						reg = <0x1>;
> > +						brcm,powerdown-enable;
> 
> Undocumented property, and I would like to understand why this needs to be
> specified in the Device Tree? What model of Broadcom Ethernet PHY is being
> used here?

It's a Broadcom BCM5421 transceiver, and that property is intended to support
the optional link-down powersave from DT. It will require slight changes in
drivers/net/phy/broadcom.c too and is not really necessary for minimal support,
so I will drop it in the next iteration.

Many thanks,
Andrea

> -- 
> Florian
>