linux-kernel - Re: [PATCH v2 0/4] auxdisplay: 7 segment LED display

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Date: Wed, 28 Feb 2024 20:45:21 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc: "geert@...ux-m68k.org" <geert@...ux-m68k.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"andrew@...n.ch" <andrew@...n.ch>,
	"gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
	"sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
	"ojeda@...nel.org" <ojeda@...nel.org>,
	"tzimmermann@...e.de" <tzimmermann@...e.de>,
	"javierm@...hat.com" <javierm@...hat.com>,
	"robin@...tonic.nl" <robin@...tonic.nl>,
	"lee@...nel.org" <lee@...nel.org>, "pavel@....cz" <pavel@....cz>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 0/4] auxdisplay: 7 segment LED display

On Wed, Feb 28, 2024 at 12:25:30AM +0000, Chris Packham wrote:
> 
> On 28/02/24 13:05, Andy Shevchenko wrote:
> > On Tue, Feb 27, 2024 at 11:22 PM Chris Packham
> > <chris.packham@...iedtelesis.co.nz> wrote:
> >> This series adds a driver for a 7 segment LED display.
> >>
> >> At this point I've decided not to pursue supporting >1 character. I had
> >> a look at what would be required to add a devm_fwnode_gpiod_get_array()
> >> and got bogged down in OF and ACPI code for counting GPIOs.
> > Out of curiosity, why did it happen? gpiod_count() works in an agnostic way.
> >
> At first I though I could create a fwnode_gpiod_count() out of the body 
> of gpiod_count(). But both of_gpio_get_count() and acpi_gpio_count() 
> take the dev not the fwnode. It looks like gpiod_count() (and 
> of_gpio_spi_cs_get_count()) could probably be re-written (or abstracted) 
> to take the device_node instead of the device. I started looking at 
> acpi_gpio_count() but I couldn't quite see how I could adapt this.
> 
> I'm definitely not saying it can't be done. Just that you probably don't 
> want an occasional contributor like me messing with some of these core 
> device abstractions.

I just sent a series. With it you may split gpiod_count() to
fwnode_gpio_count() and gpiod_count() that uses the former.
I believe you may do that easily as it won't require any special
knowledge.

-- 
With Best Regards,
Andy Shevchenko