linux-kernel - Re: [PATCH v6 1/7] phy: add a driver for the Berlin SATA PHY

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Date:	Tue, 24 Jun 2014 17:52:00 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Kishon Vijay Abraham I <kishon@...com>,
	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>,
	sebastian.hesselbarth@...il.com, tj@...nel.org,
	alexandre.belloni@...e-electrons.com,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	jszhang@...vell.com, linux-arm-kernel@...ts.infradead.org,
	linux-ide@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH v6 1/7] phy: add a driver for the Berlin SATA PHY

On 06/24/2014 05:45 PM, Lee Jones wrote:
> On Tue, 24 Jun 2014, Varka Bhadram wrote:
>> On 06/24/2014 05:30 PM, Kishon Vijay Abraham I wrote:
>>> On Monday 16 June 2014 03:56 PM, Antoine Ténart wrote:
>>>> The Berlin SoC has a two SATA ports. Add a PHY driver to handle them.
>>>>
>>>> The mode selection can let us think this PHY can be configured to fit
>>>> other purposes. But there are reasons to think the SATA mode will be
>>>> the only one usable: the PHY registers are only accessible indirectly
>>>> through two registers in the SATA range, the PHY seems to be integrated
>>>> and no information tells us the contrary. For these reasons, make the
>>>> driver a SATA PHY driver.
>>>>
>>>> Signed-off-by: Antoine Ténart <antoine.tenart@...e-electrons.com>
>>>> ---
>>>>   drivers/phy/Kconfig           |   7 ++
>>>>   drivers/phy/Makefile          |   1 +
>>>>   drivers/phy/phy-berlin-sata.c | 232 ++++++++++++++++++++++++++++++++++++++++++
>>>>   3 files changed, 240 insertions(+)
>>>>   create mode 100644 drivers/phy/phy-berlin-sata.c

[...]

>>>> +static struct platform_driver phy_berlin_sata_driver = {
>>>> +	.probe	= phy_berlin_sata_probe,
>>>> +	.driver	= {
>>>> +		.name		= "phy-berlin-sata",
>>>> +		.owner		= THIS_MODULE,
>>>> +		.of_match_table	= phy_berlin_sata_of_match,
>> use of_match_ptr for of_match_table
> What use is this?
>
> [...]
>
of_match_table is NULL for Non-DT based. Better to use the of_match_ptr().
If driver is DT based 'of_match_table	= phy_berlin_sata_of_match'
else 'of_match_table	= NULL'

This is take care by of_match_ptr() macro.

Thanks,
Varka Bhadram


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