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

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Date:   Fri, 22 Jun 2018 09:30:54 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     David Wu <david.wu@...k-chips.com>
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 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 ;-)


Heiko