linux-kernel - Re: [PATCH 1/2] ARM: dts: aspeed: catalina: update pdb board cpld ioexp linename

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Message-ID: <CAGfYmwVxwaZk-si1OkP4xeaODhAO74Hv43U=SpzOsGOBkTH8Bw@mail.gmail.com>
Date: Thu, 7 Nov 2024 19:22:13 +0800
From: Potin Lai <potin.lai.pt@...il.com>
To: Andrew Jeffery <andrew@...econstruct.com.au>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>, 
	Patrick Williams <patrick@...cx.xyz>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
	linux-kernel@...r.kernel.org, Potin Lai <potin.lai@...ntatw.com>, 
	Cosmo Chou <cosmo.chou@...ntatw.com>
Subject: Re: [PATCH 1/2] ARM: dts: aspeed: catalina: update pdb board cpld
 ioexp linename

On Thu, Nov 7, 2024 at 7:41 AM Andrew Jeffery
<andrew@...econstruct.com.au> wrote:
>
> On Wed, 2024-11-06 at 16:58 +0800, Potin Lai wrote:
> > Update the GPIO linename of each PDB CPLD IO expander based on latest
> > CPLD firmware.
>
> What version is the latest CPLD firmware? What was the previous version
> with the old pin assignments?

Because the hardware changes from EVT to DVT, the CPLD firmware
reallocated the IOEXP pin mapping in DVT version.
I will add more description into the commit message in the next version.

>
> I'm also interested in some discussion of the coordination between CPLD
> firmware, the devicetree and the BMC userspace configuration. This
> change feels pretty painful.

I am not from the CPLD firmware team, I only know our CPLD team was
redesigning the entire struct which causes the huge changes of IOEXP
pins.

This is probably a different topic, I am curious about is it possible
to assign the linename in userspace?
In OpenBMC, there are many services that depend on GPIO linename, it
will be more flexible if I can assign the linename before service
starts.

Thanks,
Potin

>
> Andrew