linux-kernel - Re: [PATCH] pinctrl: meson: meson8b: add the GPIOH pinmux settings for ETH

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Message-ID: <CACRpkdZ3uc30Efwe_2YtNJBK4FTt+dWLbY3pnh1uWSPwGu_-SQ@mail.gmail.com>
Date:   Tue, 7 Jan 2020 13:01:29 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: meson: meson8b: add the GPIOH pinmux settings
 for ETH_RXD{2,3}

On Thu, Dec 26, 2019 at 8:14 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:

> GPIOH_5 and GPIOH_6 can have two Ethernet related functions:
> - GPIOH_5 can be ETH_TXD1 or ETH_RXD3
> - GPIOH_6 can be ETH_TXD0 or ETH_RXD2
>
> Add the bits for eth_rxd3_h and eth_rxd2_h so the ETH_RXD function can
> be disabled when using the ETH_TXD function of GPIOH_{5,6}. No problem
> was observed so far, but in theory this could lead to two different
> signals being routed to the same pad (which could break Ethernet).
>
> These settings were found in the public "Amlogic Ethernet controller
> user guide":
> http://openlinux.amlogic.com/@api/deki/files/75/=Amlogic_Ethenet_controller_user_Guide.pdf
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Patch applied with Neil's review tag.

Yours,
Linus Walleij