linux-kernel - Re: [PATCH v4 3/6] gpio: aspeed: Create llops to handle hardware access

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Message-ID:
 <OSQPR06MB725290B4D7BFC47A26A0E10B8B6F2@OSQPR06MB7252.apcprd06.prod.outlook.com>
Date: Mon, 23 Sep 2024 02:20:59 +0000
From: Billy Tsai <billy_tsai@...eedtech.com>
To: Andrew Jeffery <andrew@...econstruct.com.au>, "linus.walleij@...aro.org"
	<linus.walleij@...aro.org>, "brgl@...ev.pl" <brgl@...ev.pl>,
	"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"joel@....id.au" <joel@....id.au>, "linux-gpio@...r.kernel.org"
	<linux-gpio@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-aspeed@...ts.ozlabs.org"
	<linux-aspeed@...ts.ozlabs.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, BMC-SW <BMC-SW@...eedtech.com>,
	"Peter.Yin@...ntatw.com" <Peter.Yin@...ntatw.com>, "Jay_Zhang@...ynn.com"
	<Jay_Zhang@...ynn.com>
Subject: Re: [PATCH v4 3/6] gpio: aspeed: Create llops to handle hardware
 access

> > >
> > > > @@ -1191,6 +1203,9 @@ static int __init aspeed_gpio_probe(struct
> > > > platform_device *pdev)
> > > >
> > > >       gpio->config = gpio_id->data;
> > > >
> > > > +     if (!gpio->config->llops->reg_bit_set || !gpio->config-
> > > > >llops->reg_bits_get)
> > > > +             return -EINVAL;
> > > > +
> >
> > > This will need to clean up gpio->clk. Perhaps you could move it
> > > above
> > > the of_clk_get() call instead?
> >
> > How about change the `of_clk_get` to `devm_clk_get(&pdev->dev, 0);`?

> Yep.

> >
> > > However, looking through the rest it seems we have a few issues
> > > with
> > > this leak :/
> >
> > This gpio driver doesn't have the reset, is it?

> No, just leaking the resource.

> However, I can't see that we prepare/enable (and disable/unprepare) the
> clock either :( [1]. Do you mind fixing that as well? It would be best
> if debounce didn't work by accident.

> Andrew

> [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/clk.h?h=v6.11#n527

Okay, I will update the clock API to use the `devm` prefix.

Thanks

Billy Tsai