linux-kernel - Re: [PATCH v3 1/5] mfd: intel_ehl_pse_gpio: Introduce Intel Elkhart Lake PSE GPIO and TIO

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Message-ID: <Z9Ru7VHP9K7Brod4@black.fi.intel.com>
Date: Fri, 14 Mar 2025 20:01:17 +0200
From: Raag Jadav <raag.jadav@...el.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Lee Jones <lee@...nel.org>, giometti@...eenne.com,
	gregkh@...uxfoundation.org, raymond.tan@...el.com,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/5] mfd: intel_ehl_pse_gpio: Introduce Intel Elkhart
 Lake PSE GPIO and TIO

On Fri, Mar 14, 2025 at 04:20:35PM +0200, Andy Shevchenko wrote:
> On Fri, Mar 14, 2025 at 01:57:35PM +0000, Lee Jones wrote:
> > On Fri, 14 Mar 2025, Andy Shevchenko wrote:
> > > On Fri, Mar 14, 2025 at 12:44:50PM +0000, Lee Jones wrote:
> > > > On Fri, 07 Mar 2025, Raag Jadav wrote:
> 
> ...
> 
> > > > > +	ret = pci_alloc_irq_vectors(pci, 2, 2, PCI_IRQ_ALL_TYPES);
> > > > > +	if (ret < 0)
> > > > > +		return ret;
> > > > > +
> > > > > +	ret = mfd_add_devices(&pci->dev, PLATFORM_DEVID_AUTO, ehl_pse_gpio_devs,
> > > > 
> > > > dev_*?
> > > 
> > > devm_* ?
> > 
> > Yes, typo.
> > 
> > > > > +			      ARRAY_SIZE(ehl_pse_gpio_devs), pci_resource_n(pci, 0),
> > > > > +			      pci_irq_vector(pci, 0), NULL);
> > > > > +	if (ret)
> > > > > +		pci_free_irq_vectors(pci);
> > > 
> > > Anyway, the choice as far as I understood it is motivated by usage of
> > > pci_*_irq_vector() APIs, which are officially not manageable (however
> > > in practice they are).

Are you referring to pcim_setup_msi_release()? I saw it but wasn't confident
it is in the call path, so went with manual release instead.

Now that you mentioned it, will update.

> > > > > +	return ret;
> > > > > +}
> > > > > +
> > > > > +static void ehl_pse_gpio_remove(struct pci_dev *pdev)
> > > > > +{
> > > > > +	mfd_remove_devices(&pdev->dev);
> > > > > +	pci_free_irq_vectors(pdev);
> > > > > +}
> > > 
> > > Same here.
> > 
> > Also, Greg has been quite vocal about converting PCI devices to Platform
> > ones in the past.  We may wish to run this past him before continuing.
> 
> What do you refer to? Any links to read?

Could be about faux_device, but I could be wrong since here we do use
platform resources.

Raag