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

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Date:   Wed, 20 Jun 2018 10:40:35 +0800
From:   David Wu <david.wu@...k-chips.com>
To:     Heiko Stübner <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.

> 
> And someone could convert the driver to use the new clk-bulk APIs [0],
> so the large number of clk_prepare_enable calls would be a bit
> trimmed down.
> 
> 
> Heiko
> 
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/clk/clk-bulk.c
> 
> 
> 
> 
>