linux-kernel - Re: [PATCH v2] net: ethernet: stmmac: dwmac-rk: Add GMAC support for PX30

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Message-ID: <7baeda9c-d7c4-e491-e18d-30afefa98c96@rock-chips.com>
Date:   Fri, 22 Jun 2018 16:13:13 +0800
From:   David Wu <david.wu@...k-chips.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     davem@...emloft.net, robh+dt@...nel.org, mark.rutland@....com,
        huangtao@...k-chips.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        张晴 <elaine.zhang@...k-chips.com>
Subject: Re: [PATCH v2] net: ethernet: stmmac: dwmac-rk: Add GMAC support for
 PX30

Hi Heiko,

在 2018年06月22日 15:30, Heiko Stuebner 写道:
> Hi David,
> 
> Am Mittwoch, 20. Juni 2018, 04:40:35 CEST schrieb David Wu:
>> 在 2018年06月14日 16:30, Heiko Stübner 写道:
>>> Am Donnerstag, 14. Juni 2018, 10:14:31 CEST schrieb David Wu:
>>>> Hi Heiko,
>>>>
>>>> 在 2018年06月14日 15:54, Heiko Stübner 写道:
>>>>> I don't see that new clock documented in the dt-binding.
>>>>> Also, which clock from the clock-controller does this connect to?
>>>>
>>>> The clock is the "SCLK_GMAC_RMII" at the clock-controller, which could
>>>> be set rate by the link speed.
>>>
>>> Hmm, while these huge number of clocks are somewhat strange,
>>> shouldn't it be named something with _rmii instead of _speed then?
>>
>> Okay, it is better to be named _speed.
>>
>>>
>>> Also, I don't see any clk_enable action for that new clock, so you could
>>> end up with being off?
>>
>> The new speed is the parent of the clk_tx_rx, to enable/disable
>> clk_tx_rx, the new clock would be also enabled/disabled.
> 
> Still it is nicer to really enable it, so that the clock-framework can keep
> track of usage counts.
> 
> Because also no-one hinders the chip-designer from putting a gate in
> between in one of the next socs ;-)
> 

Okay, i will add the enable/disable for clk_mac_speed.
  ;-)

> 
> Heiko
> 
> 
> 
> 
>