linux-kernel - Re: [PATCH 0/3] auxdisplay: 7 segment LED display

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Message-ID: <CAHp75Vc9OBtxdKSmk9Uu9G3j+mfN8+9prTEVx3LyUcdBYFEqwg@mail.gmail.com>
Date: Mon, 26 Feb 2024 04:23:15 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: ojeda@...nel.org, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, 
	conor+dt@...nel.org, andrew@...n.ch, gregory.clement@...tlin.com, 
	sebastian.hesselbarth@...il.com, geert@...ux-m68k.org, pavel@....cz, 
	lee@...nel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH 0/3] auxdisplay: 7 segment LED display

On Sun, Feb 25, 2024 at 11:34 PM Chris Packham
<chris.packham@...iedtelesis.co.nz> wrote:
>
> This series adds a driver for a 7 segment LED display.
>
> I'd like to get some feedback on how this could be extended to support >1
> character. The driver as presented is sufficient for my hardware which only has
> a single character display but I can see that for this to be generically useful
> supporting more characters would be desireable.
>
> Earlier I posted an idea that the characters could be represended by
> sub-nodes[1] but there doesn't seem to be a way of having that and keeping the
> convenience of using devm_gpiod_get_array() (unless I've missed something).

It seems you didn't know that the tree for auxdisplay has been changed.
Can you rebase your stuff on top of
https://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-auxdisplay.git/log/?h=for-next?
It will reduce your code base by ~50%.

WRT subnodes, you can go with device_for_each_child_node() and
retrieve gpio array per digit. It means you will have an array of
arrays of GPIOs.

> [1] - https://lore.kernel.org/lkml/2a8d19ee-b18b-4b7c-869f-7d601cea30b6@alliedtelesis.co.nz/



-- 
With Best Regards,
Andy Shevchenko