linux-kernel - Re: [PATCH v2] MFD: PCAP core driver.

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Message-Id: <1243314635.10927.30.camel@brutus>
Date:	Tue, 26 May 2009 02:10:35 -0300
From:	Daniel Ribeiro <drwyrm@...il.com>
To:	pHilipp Zabel <philipp.zabel@...il.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Harald Welte <laforge@...monks.org>,
	David Brownell <david-b@...bell.net>,
	openezx-devel <openezx-devel@...ts.openezx.org>
Subject: Re: [PATCH v2] MFD: PCAP core driver.

Hi Philipp, Thanks for the review! :)

Em Seg, 2009-05-25 às 21:55 +0200, pHilipp Zabel escreveu:
> > +static int pcap_add_subdev(struct spi_device *spi, struct pcap_subdev *subdev)
> > +{
> > +       struct platform_device *pdev;
> > +
> > +       pdev = platform_device_alloc(subdev->name, subdev->id);
> > +       pdev->dev.parent = &spi->dev;
> > +       pdev->dev.platform_data = subdev->platform_data;
> > +
> > +       return platform_device_add(pdev);
> > +}
> 
> This pcap_subdev, pcap_remove/add_subdev business looks a bit like
> you're duplicating the MFD core just because it doesn't handle
> resource-less mfd_cells. I wonder whether it'd be better to fix that
> and then use
> mfd_cell, mfd_add/remove_devices instead?

Due to the lack of comments on this driver, i started grepping LKML for
previous MFD reviews. Now the driver allows multiple instances and no
longer keeps pcap_chip as a global(as per Samuel comments on U300/AB3100
driver), result is that resource-less mfd_cells are no longer the only
issue so I can use the mfd_ API: Now I also need a way to pass a
pcap_chip pointer to the subdevs.

> > +       set_irq_type(pdata->irq, IRQ_TYPE_EDGE_RISING);
> > +       set_irq_chained_handler(pdata->irq, pcap_irq_handler);
> > +       set_irq_wake(pdata->irq, 1);
> 
> Looking at the other MFD drivers that register a chained handler,
> providing this IRQ via a resource seems to be the default.

Ok, will do.


I will send a new version of the patch tomorrow, after i finish
converting all the subdevices to the new code.

Thanks!

-- 
Daniel Ribeiro

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