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From: Arnd Bergmann <arnd@arndb.de>
To: Guo Ren <guoren@kernel.org>
Cc: Anup Patel <anup.patel@wdc.com>,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	 Chen-Yu Tsai <wens@csie.org>, Maxime Ripard <maxime@cerno.tech>,
	Drew Fustini <drew@beagleboard.org>,
	 liush@allwinnertech.com, lazyparser@gmail.com, wefu@redhat.com,
	 linux-riscv <linux-riscv@lists.infradead.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	 linux-sunxi@lists.linux.dev, Maxime Ripard <mripard@kernel.org>,
	 Corentin Labbe <clabbe@baylibre.com>,
	Samuel Holland <samuel@sholland.org>,
	 Icenowy Zheng <icenowy@aosc.io>,
	LABBE Corentin <clabbe.montjoie@gmail.com>,
	 Michael Walle <michael@walle.cc>,
	Guo Ren <guoren@linux.alibaba.com>
Subject: Re: [RFC PATCH v2 11/11] riscv: soc: Allwinner D1 GMAC driver only for temp use
Date: Sun, 6 Jun 2021 18:16:44 +0200	[thread overview]
Message-ID: <CAK8P3a0yHEGH8=o_TQ+ajRn53j+mHxYxqyYLPXnUe=YWkTHDBw@mail.gmail.com> (raw)
In-Reply-To: <1622970249-50770-15-git-send-email-guoren@kernel.org>

On Sun, Jun 6, 2021 at 11:04 AM <guoren@kernel.org> wrote:

> diff --git a/arch/riscv/boot/dts/allwinner/allwinner-d1-nezha-kit.dts b/arch/riscv/boot/dts/allwinner/allwinner-d1-nezha-kit.dts
> index cd9f7c9..31b681d 100644
> --- a/arch/riscv/boot/dts/allwinner/allwinner-d1-nezha-kit.dts
> +++ b/arch/riscv/boot/dts/allwinner/allwinner-d1-nezha-kit.dts
> @@ -11,7 +11,7 @@
>         compatible = "allwinner,d1-nezha-kit";
>
>         chosen {
> -               bootargs = "console=ttyS0,115200";
> +               bootargs = "console=ttyS0,115200 rootwait init=/sbin/init root=/dev/nfs rw nfsroot=192.168.101.200:/tmp/rootfs_nfs,v3,tcp,nolock ip=192.168.101.23";

These are not board specific options, they should be set by the bootloader
according to the network environment. It clearly doens't belong
into this patch .

>                 stdout-path = &serial0;
>         };
>
> diff --git a/arch/riscv/boot/dts/allwinner/allwinner-d1.dtsi b/arch/riscv/boot/dts/allwinner/allwinner-d1.dtsi
> index 11cd938..d317e19 100644
> --- a/arch/riscv/boot/dts/allwinner/allwinner-d1.dtsi
> +++ b/arch/riscv/boot/dts/allwinner/allwinner-d1.dtsi
> @@ -80,5 +80,21 @@
>                         clocks = <&dummy_apb>;
>                         status = "disabled";
>                 };
> +
> +               eth@4500000 {
> +                       compatible = "allwinner,sunxi-gmac";
> +                       reg = <0x00 0x4500000 0x00 0x10000 0x00 0x3000030 0x00 0x04>;
> +                       interrupts-extended = <&plic 0x3e 0x04>;
> +                       interrupt-names = "gmacirq";
> +                       device_type = "gmac0";
> +                       phy-mode = "rgmii";
> +                       use_ephy25m = <0x01>;
> +                       tx-delay = <0x03>;
> +                       rx-delay = <0x03>;
> +                       gmac-power0;
> +                       gmac-power1;
> +                       gmac-power2;
> +                       status = "okay";
> +               };

Before you add this in the dts file, the properties need to be documented in
the binding file. The "allwinner,sunxi-gmac" identifier does not appear to
be specific enough here, and the properties don't match what dwmac uses,
which would make it unnecessarily hard to change to the other driver
later on without breaking compatibility to old dtb files.

> +++ b/drivers/net/ethernet/allwinnertmp/sunxi-gmac-ops.c
> @@ -0,0 +1,690 @@
> +/*
> + * linux/drivers/net/ethernet/allwinner/sunxi_gmac_ops.c
> + *
> + * Copyright © 2016-2018, fuzhaoke
> + *             Author: fuzhaoke <fuzhaoke@allwinnertech.com>
> + *
> + * This file is provided under a dual BSD/GPL license.  When using or
> + * redistributing this file, you may do so under either license.

Are you sure this is the correct copyright information and "fuzhaoke" is
the copyright holder for this file? If this is derived from either the
designware
code or the Linux stmmac driver, the authors should be mentioned,
and the license be compatible with the original license terms.

Andre already commented on the driver quality and code duplication, those are
also show-stoppers, but the unclear license terms and dt binding compatibility
are even stronger reasons to not get anywhere close to this driver.

        Arnd

  parent reply	other threads:[~2021-06-06 16:18 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-06  9:03 [RFC PATCH v2 00/11] riscv: Add DMA_COHERENT support for Allwinner D1 guoren
2021-06-06  9:03 ` [RFC PATCH v2 01/11] riscv: asid: Use global mappings for kernel pages guoren
2021-06-06  9:03 ` [PATCH V5 1/3] riscv: " guoren
2021-06-06  9:03 ` [PATCH V5 2/3] riscv: Add ASID-based tlbflushing methods guoren
2021-06-06 14:38   ` Christoph Hellwig
2021-06-06  9:03 ` [RFC PATCH v2 02/11] riscv: asid: " guoren
2021-06-06  9:04 ` [RFC PATCH v2 03/11] riscv: asid: Optimize tlbflush coding convention guoren
2021-06-06  9:04 ` [PATCH V5 3/3] riscv: tlbflush: Optimize " guoren
2021-06-06  9:04 ` [RFC PATCH v2 04/11] riscv: pgtable: Fixup _PAGE_CHG_MASK usage guoren
2021-06-06  9:04 ` [RFC PATCH v2 05/11] riscv: pgtable: Add custom protection_map init guoren
2021-06-06  9:04 ` [RFC PATCH v2 06/11] riscv: pgtable: Add DMA_COHERENT with custom PTE attributes guoren
2021-06-06 14:39   ` Christoph Hellwig
2021-06-06 15:08     ` Guo Ren
2021-06-06 17:22   ` Nick Kossifidis
2021-06-07  6:19     ` Christoph Hellwig
2021-06-06  9:04 ` [RFC PATCH v2 07/11] riscv: cmo: Add dma-noncoherency support guoren
2021-06-06  9:04 ` [RFC PATCH v2 08/11] riscv: cmo: Add vendor custom icache sync guoren
2021-06-06  9:04 ` [RFC PATCH v2 09/11] riscv: soc: Initial DTS for Allwinner D1 NeZha board guoren
2021-06-06 16:26   ` Jernej Škrabec
2021-06-06 17:05     ` Guo Ren
2021-06-07  3:44     ` Guo Ren
2021-06-07  7:27       ` Maxime Ripard
2021-06-07  7:53         ` Guo Ren
2021-06-07  7:24   ` Maxime Ripard
2021-06-07  8:07     ` Guo Ren
2021-06-14 15:33       ` Maxime Ripard
2021-06-14 16:28         ` Guo Ren
2021-06-14 16:31           ` Jernej Škrabec
2021-06-06  9:04 ` [RFC PATCH v2 10/11] riscv: soc: Add Allwinner SoC kconfig option guoren
2021-06-07  7:19   ` Maxime Ripard
2021-06-07  7:27     ` Arnd Bergmann
2021-06-07  7:45       ` Guo Ren
2021-06-07  7:43     ` Guo Ren
2021-06-07 12:12       ` Maxime Ripard
2021-06-07 12:39         ` Guo Ren
2021-06-06  9:04 ` [RFC PATCH v2 11/11] riscv: soc: Allwinner D1 GMAC driver only for temp use guoren
2021-06-06 10:50   ` Andre Przywara
2021-06-06 15:32     ` Guo Ren
2021-06-06 15:39       ` Jernej Škrabec
2021-06-06 15:41         ` Guo Ren
2021-06-06 16:16   ` Arnd Bergmann [this message]
2021-06-06 16:32     ` Jernej Škrabec
2021-06-06 16:53       ` Guo Ren
2021-06-06 16:53     ` Guo Ren
2021-06-06 16:29 ` [RFC PATCH v2 00/11] riscv: Add DMA_COHERENT support for Allwinner D1 Jernej Škrabec
2021-06-06 16:54   ` Guo Ren
2021-06-06 17:14     ` Jernej Škrabec
2021-06-06 23:42       ` Guo Ren
2021-06-07  3:44 ` Anup Patel
2021-06-07  4:36   ` Guo Ren

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