netdev - Re: [PATCH v8 2/3] net: hisilicon: new hip04 MDIO driver

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Message-ID: <535679A6.4020103@linaro.org>
Date:	Tue, 22 Apr 2014 22:16:06 +0800
From:	zhangfei <zhangfei.gao@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
CC:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>, xuwei5@...ilicon.com,
	David Laight <David.Laight@...lab.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v8 2/3] net: hisilicon: new hip04 MDIO driver

On 04/22/2014 04:22 PM, Arnd Bergmann wrote:

>> It's private register of the phy marvell 88e1512.
>> To make it clearer using define instead.
>> #define MII_MARVELL_PHY_PAGE    22
>>
>> The registers has been grouped into several pages, access register need
>> choose which page first.
>
> You shouldn't touch the PHY private registers in the main driver though,
> this should be purely handled by drivers/net/phy/marvell.c.
>
> I don't see support for 88e1512 there, only 88e1510 and lots of older
> ones, but I assume it isn't hard to add.
>

88e1512 driver is already supported, same as 88e1510.
#define MARVELL_PHY_ID_MASK             0xfffffff0
So it should support 88e151x.

Reset is required here for get_phy_id, otherwise only 0 can be get.
phy_device_create will not be called, and can not match any driver.

However in the experiment, it is found BMCR_RESET is not required in fact.
Only hip04_mdio_write(bus, i, MII_MARVELL_PHY_PAGE, 0) has to be set.
88e151x registers are divided into pages.
Generic MII registers is in page 0, including MII_PHYSID1 and MII_PHYSID2.
Unfortunately the default page is not 0, so get_phy_id will fail.

So bus->reset still required to set the page to 0, prepared for get_phy_id.

Thanks

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