From: Drew Fustini <drew@beagleboard.org>
To: Felipe Balbi <balbi@kernel.org>
Cc: "Linus Walleij" <linus.walleij@linaro.org>,
"Grygorii Strashko" <grygorii.strashko@ti.com>,
"Benoît Cousson" <bcousson@baylibre.com>,
"Tony Lindgren" <tony@atomide.com>,
"Rob Herring" <robh+dt@kernel.org>,
Linux-OMAP <linux-omap@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Jason Kridner" <jkridner@beagleboard.org>,
"Robert Nelson" <robertcnelson@beagleboard.org>
Subject: Re: [PATCH] arm: dts: am33xx-bone-common: add gpio-line-names
Date: Mon, 18 May 2020 16:24:02 +0200 [thread overview]
Message-ID: <20200518142402.GB916914@x1> (raw)
In-Reply-To: <87zha5whf4.fsf@kernel.org>
On Mon, May 18, 2020 at 03:34:23PM +0300, Felipe Balbi wrote:
> Linus Walleij <linus.walleij@linaro.org> writes:
>
> > On Mon, May 18, 2020 at 10:18 AM Felipe Balbi <balbi@kernel.org> wrote:
> >> Linus Walleij <linus.walleij@linaro.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.
Thank you for pointing this out. That is my goal with the line names.
> >
> > OK if it is how it looks in the documentation I agree that is what
> > users need, maybe the documentation is confusing but there is not
> > much to do about that.
>
> the board has two expansion headers, P1 and P2:
>
> https://github.com/beagleboard/pocketbeagle/wiki/System-Reference-Manual#531_Expansion_Headers
>
> Pins are always the pin number on the header, hence P2_21 and P1_10 and
> so on.
Just to clarify, the patch was for the BeagleBone {White,Green,Black}
which have P8 and P9 headers.
The PocketBeagle has lower pin count headers labeled P1 and P2. I do
plan to submit a patch for am335x-pocketbeagle.dts with the respective
line names, but I wanted to first integrate feedback regarding P8/P9 on
the bone.
thanks,
drew
next prev parent reply other threads:[~2020-05-18 14:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 16:58 [PATCH] arm: dts: am33xx-bone-common: add gpio-line-names Drew Fustini
2020-05-12 13:52 ` Tony Lindgren
2020-05-18 7:11 ` Linus Walleij
2020-05-18 8:18 ` Felipe Balbi
2020-05-18 8:41 ` Linus Walleij
2020-05-18 12:34 ` Felipe Balbi
2020-05-18 14:24 ` Drew Fustini [this message]
2020-05-18 14:18 ` Drew Fustini
2020-05-20 22:02 ` Drew Fustini
2020-05-25 9:23 ` Linus Walleij
2020-05-25 12:07 ` Drew Fustini
2020-05-25 13:03 ` Linus Walleij
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