netdev - Re: [RFC PATCH net-next v2 2/3] sh_eth: add support RMIIMODE register

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Message-ID: <51AFA30B.4080809@cogentembedded.com>
Date:	Thu, 06 Jun 2013 00:43:55 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Simon Horman <horms@...ge.net.au>
CC:	netdev@...r.kernel.org, linux-sh@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [RFC PATCH net-next v2 2/3] sh_eth: add support RMIIMODE register

Hello.

On 05/15/2013 04:51 AM, Simon Horman wrote:

>>> This change is motivated by the lager board which uses the r8a7790 SoC,
>>> an R-Car SoC. For this board setting the RMIIMODE register is necessary.
>>> This patch assumes this is valid for all R-Car SoCs.
>>     No, RMIIMODE register is not documented on R8A7778/9 SoCs and
>> this location is described as reserved. How's it called in R8A7790
>> manual, CXR15?
> It appears to be undocumented in the R8A7790 I have.

     Of the manuals I have now this register is only documented in R-Car 
H2 user's manual 0.50,

> Empirically it seems necessary for the lager/R8A7790.

    The manual confirms that.

> To be honest I am entirely unsure of its relevance to other SoCs.
>
> I wonder if a better approach would be to add a flag to platform
> data rather than struct sh_eth_cpu_data. This would allow the register
> to only be accessed on boards where it is known to be useful.

    No, this doesn't depend on the board, judging on the H2 manual.
You just must write it to 1 on R-Car H2 in order for Ether to operate.

>
>>> Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
>>
WBR, Sergei


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