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

[Felipe Balbi]

Linus Walleij <linus.walleij@xxxxxxxxxx> writes:

> On Mon, May 18, 2020 at 10:18 AM Felipe Balbi <balbi@xxxxxxxxxx> wrote:
>> Linus Walleij <linus.walleij@xxxxxxxxxx> 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.
>
> 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.

-- 
balbi

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