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

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Message-ID: <20140624123933.GN13803@lee--X1>
Date:	Tue, 24 Jun 2014 13:39:33 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Varka Bhadram <varkabhadram@...il.com>
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 Tue, 24 Jun 2014, Varka Bhadram wrote:

> 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.

This driver 'depends on OF', so it's okay to always populate
.of_match_table.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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