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From: yuan linyu <cugyly@163.com>
Subject: Re: [PATCH] net: add regs attribute to phy device for user diagnose
Date: Mon, 16 Jan 2017 20:59:39 +0800
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Cc: Florian Fainelli <f.fainelli@gmail.com>,
        "David S . Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
To: Andrew Lunn <andrew@lunn.ch>
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On 日, 2017-01-15 at 18:21 +0100, Andrew Lunn wrote:
> On Sun, Jan 15, 2017 at 09:51:03AM +0800, yuan linyu wrote:
> > 
> > I hope user/developer can read this attribute file "regs" to do
> > a full check of all registers value, and they can write any register
> > inside PHY through this file.
> Since this is intended for debug, it should not be sysfs, but debugfs.
agree,
> However, in general, Linux does not allow user space to peek and poke
> device registers. Can you point me at examples where i can do the same
> to my GPU? SATA controller? Ethernet controller, I2C temperature
> sensor? Any device?
we can read registers of ethernet controller(memory register accessed) through devmem or ethtool
> 
>    Andrew
>