linux-kernel - Re: Re: [PATCH v2 2/2] arm64: dts: rockchip: Add Bananapi R2 Pro

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Date:   Mon, 24 Jan 2022 12:03:31 +0100
From:   Sascha Hauer <sha@...gutronix.de>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Peter Geis <pgwipeout@...il.com>,
        Johan Jonker <jbx6244@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH v2 2/2] arm64: dts: rockchip: Add Bananapi R2 Pro

On Mon, Jan 24, 2022 at 09:55:05AM +0100, Frank Wunderlich wrote:
> Hi
> 
> > Gesendet: Montag, 24. Januar 2022 um 09:31 Uhr
> > Von: "Sascha Hauer" <sha@...gutronix.de>
> > An: "Frank Wunderlich" <linux@...web.de>
> > Cc: linux-rockchip@...ts.infradead.org, "Frank Wunderlich" <frank-w@...lic-files.de>, "Rob Herring" <robh+dt@...nel.org>, "Heiko Stuebner" <heiko@...ech.de>, "Peter Geis" <pgwipeout@...il.com>, "Johan Jonker" <jbx6244@...il.com>, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
> > Betreff: Re: [PATCH v2 2/2] arm64: dts: rockchip: Add Bananapi R2 Pro
> >
> > On Sun, Jan 23, 2022 at 02:51:16PM +0100, Frank Wunderlich wrote:
> > > From: Frank Wunderlich <frank-w@...lic-files.de>
> > >
> > > This patch adds Devicetree for Bananapi R2 Pro based on RK3568.
> > > Add uart/sd/emmc/i2c/rk809/tsadc nodes for basic function.
> > > Gmac0 is directly connected to wan-port so usable without additional
> > > driver.
> > > On gmac1 there is a switch (rtl8367rb) connected which have not yet a
> > > driver in mainline.
> > >
> > > Patch also prepares nodes for GPIO header.
> > >
> > > Co-developed-by: Peter Geis <pgwipeout@...il.com>
> > > Signed-off-by: Peter Geis <pgwipeout@...il.com>
> > > Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> > > ---
> > > +&gmac0 {
> > > +	assigned-clocks = <&cru SCLK_GMAC0_RX_TX>, <&cru SCLK_GMAC0>;
> > > +	assigned-clock-parents = <&cru SCLK_GMAC0_RGMII_SPEED>, <&cru CLK_MAC0_2TOP>;
> > > +	clock_in_out = "input";
> > > +	phy-handle = <&rgmii_phy0>;
> > > +	phy-mode = "rgmii";
> > > +	pinctrl-names = "default";
> > > +	pinctrl-0 = <&gmac0_miim
> > > +		     &gmac0_tx_bus2
> > > +		     &gmac0_rx_bus2
> > > +		     &gmac0_rgmii_clk
> > > +		     &gmac0_rgmii_bus>;
> > > +
> > > +	snps,reset-gpio = <&gpio3 RK_PB7 GPIO_ACTIVE_LOW>;
> > > +	snps,reset-active-low;
> > > +	/* Reset time is 20ms, 100ms for rtl8211f */
> >
> > Is this really a rtl8211f? I don't know and it could indeed be a
> > rtl8211f, I'm just asking because the comment is copy pasted from
> > the Quartz64 board.
> 
> i know thats a RTL8211 phy, but i see no additional letter on the
> chip, based on shematics it's a RTL8211F-CG

Ok. I just wanted to make sure you checked that.

> 
> > > +	snps,reset-delays-us = <0 20000 100000>;
> > > +
> > > +&mdio0 {
> > > +	rgmii_phy0: ethernet-phy@0 {
> > > +		compatible = "ethernet-phy-ieee802.3-c22";
> > > +		reg = <0x0>;
> > > +	};
> >
> > 0 is the broadcast address. I'm not sure if it's a good idea to use it.
> > There should be another address the phy listens on.
> 
> took this from the 3568-EVB (like the most parts, as the board is
> mostly the same), and in linux it's the same and working. The switch
> have also phy-id 0 on mdio bus #1, are you sure this is invalid?

It's not invalid, it's just the broadcast address to which other phys
might answer as well. Anyway, as long as there's only a single phy on
the bus it's probably okay.

Sascha


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