linux-kernel - Re: [PATCH v5] arm64: allwinner: h5: add support for NanoPi NEO Plus2

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Date:   Tue, 5 Sep 2017 13:04:52 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Antony Antony <antony@...nome.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        linux-sunxi@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] arm64: allwinner: h5: add support for NanoPi NEO Plus2

Hi Antony,

On Mon, Sep 04, 2017 at 04:26:19PM +0200, Antony Antony wrote:
> On Mon, Sep 04, 2017 at 10:27:32AM +0200, Maxime Ripard wrote:
> > On Fri, Sep 01, 2017 at 12:53:13PM +0200, Antony Antony wrote:
> > > > > +&emac {
> > > > > +	pinctrl-names = "default";
> > > > > +	pinctrl-0 = <&emac_rgmii_pins>;
> > > > > +	phy-supply = <&reg_gmac_3v3>;
> > > > > +	phy-handle = <&ext_rgmii_phy>;
> > > > > +	phy-mode = "rgmii";
> > > > > +	status = "okay";
> > > > > +};
> > > > > +
> > > > > +&mdio {
> > > > > +	ext_rgmii_phy: ethernet-phy@7 {
> > > > > +		compatible = "ethernet-phy-ieee802.3-c22";
> > > > > +		reg = <7>;
> > > > > +	};
> > > > > +};
> > > > 
> > > > This will not compile.
> > > 
> > > I don't understand you, because, v5 file compiled for me. Here is output 
> > > from running system, just the relevant part.  using dtc -I fs 
> > > /proc/device-tree
> > > 
> > > ext_rgmii_phy = "/soc/ethernet@...0000/mdio/ethernet-phy@7";
> > > 
> > > ethernet@...0000 {
> > > 	mdio {
> > > 	..
> > > 		ethernet-phy@7 {
> > > 			compatible = "ethernet-phy-ieee802.3-c22";
> > > 			phandle = <0x1c>;
> > > 			reg = <0x7>;
> > > 			linux,phandle = <0x1c>;
> > > 		};
> > > };
> > > 
> > > Is this what you expect?
> > 
> > The bindings have been reverted recently, so if you based your work on
> > a version between 4.13-rc1 and 4.13-rc6 it will work, but anything
> > more recent will not compile anymore.
> 
> I deleted emc and related node.
> I see. I hope stmmac: sun8i come back soon. It works well well on this 
> board, running 4.13-rc6

Yeah, I hope too. Unfortunately, the DT bindings were still under
discussion after it's been merged, so we couldn't guarantee their
stability in the future.

> > > > > +&usb_otg {
> > > > > +	dr_mode = "host";
> > > > > +	status = "okay";
> > > > > +};
> > > > > +
> > > > > +&usbphy {
> > > > > +	/* USB Type-A ports' VBUS is always on */
> > > > > +	usb0_id_det-gpios = <&pio 6 12 GPIO_ACTIVE_HIGH>; /* PG12 */
> > > > 
> > > > If it has an ID-detect pin, then it's not a host-only USB OTG
> > > > controller. dr_mode should be set to otga 
> > > 
> > > good point. I don't see an ID-detect connected in the schematic. The 
> > > previous generation had. 
> > > 
> > > I will leave 
> > > &usb_otg {
> > >   dr_mode = "host";
> > >   status = "okay";
> > > };
> > > 
> > > &usbphy {
> > > 	/* USB Type-A ports' VBUS is always on */
> > > 	status = "okay";
> > > };
> > 
> > Looking at the schematics, it seems that the micro USB isn't even
> > wired to a bus but is only used to power the board. If so, you can
> > even remove the usb_otg node.
> 
> Yes, the Micro USB data pins are not connected. However, it there is a 
> second USB A port connected to the processor. If I remove &usb_otg node, in 
> 4.13-rc6, the second port goes to disabled.

Ok, someone got creative :)

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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