linux-kernel - Re: [PATCH v3 05/12] phy: add the Berlin USB PHY driver

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Message-ID: <20140716094747.GD28151@kwain>
Date:	Wed, 16 Jul 2014 11:47:47 +0200
From:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
To:	Varka Bhadram <varkabhadram@...il.com>
Cc:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>,
	sebastian.hesselbarth@...il.com, Peter.Chen@...escale.com,
	balbi@...com, p.zabel@...gutronix.de,
	alexandre.belloni@...e-electrons.com,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 05/12] phy: add the Berlin USB PHY driver

On Wed, Jul 16, 2014 at 03:03:14PM +0530, Varka Bhadram wrote:
> On 07/16/2014 02:55 PM, Antoine Ténart wrote:
> >Hi Varka,
> >
> >On Wed, Jul 16, 2014 at 02:49:05PM +0530, Varka Bhadram wrote:
> >>On 07/16/2014 01:55 PM, Antoine Ténart wrote:
> >>>+static const struct of_device_id phy_berlin_sata_of_match[] = {
> >>>+	{
> >>>+		.compatible = "marvell,berlin2-usb-phy",
> >>>+		.data = &phy_berlin_pll_dividers[0],
> >>>+	},
> >>>+	{
> >>>+		.compatible = "marvell,berlin2cd-usb-phy",
> >>>+		.data = &phy_berlin_pll_dividers[1],
> >>>+	},
> >>>+	{ },
> >>>+};
> >>>+MODULE_DEVICE_TABLE(of, phy_berlin_sata_of_match);
> >>>+
> >>It looks good if we move this after probe().. So that we can see of_match_table directly...
> >We use the of match table in the probe, when calling of_match_device().
> >
> >>>+static int phy_berlin_usb_probe(struct platform_device *pdev)
> >>>+{
> >>>+	const struct of_device_id *match =
> >>>+		of_match_device(phy_berlin_sata_of_match, &pdev->dev);
> 
> We are updating of_match_table in platform_driver struct.

Yes. This is not the same thing. of_match_device() allows to get a
pointer to the of_device_id that matched, to retrieve its data.

> 
> Every driver follows the concept of giving the of_device_ids
> above the platform_driver declaration...

Lots of drivers using of_match_device() declare their of_device_id
structure before the probe.

Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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