linux-kernel - Re: [PATCH 1/6] wifi: ath9k: Obtain system GPIOS from descriptors

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Date: Thu, 01 Feb 2024 15:18:59 +0100
From: Toke Høiland-Jørgensen <toke@...e.dk>
To: Arnd Bergmann <arnd@...db.de>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Kalle Valo <kvalo@...nel.org>,
 Arend van Spriel <aspriel@...il.com>, Franky Lin
 <franky.lin@...adcom.com>, Hante Meuleman <hante.meuleman@...adcom.com>,
 Lee Jones <lee@...nel.org>, Brian Norris <briannorris@...omium.org>,
 Srinivasan Raju <srini.raju@...elifi.com>, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com
Subject: Re: [PATCH 1/6] wifi: ath9k: Obtain system GPIOS from descriptors

"Arnd Bergmann" <arnd@...db.de> writes:

> On Thu, Feb 1, 2024, at 14:17, Andy Shevchenko wrote:
>> On Thu, Feb 01, 2024 at 01:20:16PM +0100, Arnd Bergmann wrote:
>>> On Wed, Jan 31, 2024, at 23:37, Linus Walleij wrote:
>>
>>> +	} else if (ah->led_pin < 0) {
>>
>> ...
>>
>>> +	if (sc->sc_ah->led_gpio)
>>
>> Dup check
>
> I don't know what you mean here. To explain what I'm
> trying to do: The idea is that the LED is always backed
> by either gpiolib or the internal gpio controller on
> the PCI device. This means every access to an LED must
> be guarded with 
>
>    if (gpiodesc)
>          gpio_*(gpiodesc);
>    else
>          internal(ah);
>
> We could probably go a little further in the cleanup and
> throw out the gpiolib path entirely, instead relying
> on the existing leds-gpio driver. Since there are currently
> no upstream users of the gpiolib path, that would likely
> lead to cleaner code but require more changes to any
> out-of-tree users that rely on the platform_data to
> pass the GPIOs today.

There being exactly one such out of tree user (per your up-thread
email) in OpenWrt? Or are you aware of others?

-Toke