linux-kernel - Re: [PATCH] arm: dts: am33xx-bone-common: add gpio-line-names

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Message-ID: <875zcty7tt.fsf@kernel.org>
Date:   Mon, 18 May 2020 11:18:38 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Drew Fustini <drew@...gleboard.org>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        "open list\:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...gleboard.org>
Subject: Re: [PATCH] arm: dts: am33xx-bone-common: add gpio-line-names

Linus Walleij <linus.walleij@...aro.org> writes:
>> gpiochip0 - 32 lines:
>>         line   0:   "ethernet"       unused   input  active-high
>>         line   1:   "ethernet"       unused   input  active-high
>
> Why are the ethernet lines not tagged with respective signal name
> when right below the SPI lines are explicitly tagged with
> sclk, cs0 etc?
>
> Ethernet is usually RGMII and has signal names like
> tx_clk, tx_d0, tx_en etc.
>
> Also some lines seem to be tagged with the pin number
> like P9_22, P2_21 below, it seems a bit inconsistent
> to have much information on some pins and very sketchy
> information on some.

the pin names match the beagle bone documentation and would help users
figure out which pins on the expansion headers match to a gpio signal.

-- 
balbi

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