RE: [PATCH V2 net-next 2/7] dt-bindings: net: fsl,fec: add RGMII internal clock delay

[Joakim Zhang <qiangqing.zhang@nxp.com>]

> -----Original Message-----
> From: Andrew Lunn <andrew@lunn.ch>
> Sent: 2021年7月28日 22:08
> To: Joakim Zhang <qiangqing.zhang@nxp.com>
> Cc: davem@davemloft.net; kuba@kernel.org; robh+dt@kernel.org;
> shawnguo@kernel.org; s.hauer@pengutronix.de; kernel@pengutronix.de;
> festevam@gmail.com; dl-linux-imx <linux-imx@nxp.com>;
> netdev@vger.kernel.org; devicetree@vger.kernel.org;
> linux-kernel@vger.kernel.org
> Subject: Re: [PATCH V2 net-next 2/7] dt-bindings: net: fsl,fec: add RGMII
> internal clock delay
> 
> On Wed, Jul 28, 2021 at 07:51:58PM +0800, Joakim Zhang wrote:
> 
> > +      The "enet_2x_txclk"(option), for RGMII sampling clock which fixed at
> 250Mhz.
> > +      The clock is required if SoC RGMII enable clock delay.
> 
> Hi Joakim
> 
> So you only need the clock if you are using RGMII delays? For RGMII without
> delays, the clock is not needed?
> 
> You might want to add a check in the C code that the clock is provided when
> needed.

Hi Andrew,

Yes, we only need this clock for RGMII delays, the clock is not needed for RGMII without delays.

Had better add below check to avoid enabling needless clock. 
	if (fep->rgmii_txc_dly || fep->rgmii_rxc_dly)

Best Regards,
Joakim Zhang
>      Andrew