linux-kernel - Re: Re: [PATCH] kbuild: Add DTC_CPP

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Date:   Thu, 19 Dec 2019 11:02:01 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: Re: [PATCH] kbuild: Add DTC_CPP_FLAGS

On Thu, Dec 19, 2019 at 6:05 AM Frank Wunderlich
<frank-w@...lic-files.de> wrote:
>
> Hi Rob,
>
> so the way you prefer is this one (use new file for additions and including the board dts):

Yes, or you could use an overlay, but that will raise other issues
(current lack of support building them in the kernel).

> arch/arm64/boot/dts/mediatek/mt7622-bpi-r64-mt7531.dts (example for mt7531-phy)
>
> /*
>  * Copyright (c) 2018 MediaTek Inc.
>  * Author:
>  *
>  * SPDX-License-Identifier: (GPL-2.0 OR MIT)
>  */
>
> /dts-v1/;
>
> #include "mt7622-bananapi-bpi-r64.dts"
>
> / {
>         gsw: gsw@0 {
>                 compatible = "mediatek,mt753x";
>                 mediatek,ethsys = <&ethsys>;
>                 #address-cells = <1>;
>                 #size-cells = <0>;
>         };
> };
>
> &gsw {
>         mediatek,mdio = <&mdio>;
>         mediatek,portmap = "wllll";
>         mediatek,mdio_master_pinmux = <0>;
>         reset-gpios = <&pio 54 0>;
>         interrupt-parent = <&pio>;
>         interrupts = <53 IRQ_TYPE_LEVEL_HIGH>;
>         status = "okay";
>
>         port5: port@5 {
>                 compatible = "mediatek,mt753x-port";
>                 reg = <5>;
>                 phy-mode = "rgmii";
>                 fixed-link {
>                         speed = <1000>;
>                         full-duplex;
>                 };
>         };
>
>         port6: port@6 {
>                 compatible = "mediatek,mt753x-port";
>                 reg = <6>;
>                 phy-mode = "2500base-x";
>                 fixed-link {
>                         speed = <2500>;
>                         full-duplex;
>                 };
>         };
> };
>
> at least it compiles and after decompile the new nodes are visible...
>
> is there any way to drop nodes (in case dsa-driver gets merged i don't need it in the other 2)? i can disable them, but they will be present.

Yes, use '/delete-node/'.

Rob