lkml.org 
[lkml]   [2020]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] arm: dts: am33xx-bone-common: add gpio-line-names
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

\
 
 \ /
  Last update: 2020-05-18 16:24    [W:0.086 / U:0.160 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site