From: Sascha Hauer <s.hauer@pengutronix.de>
To: Marco Felsch <m.felsch@pengutronix.de>
Cc: barebox@lists.infradead.org, mfe@pengutronix.de
Subject: Re: [PATCH] net: phy: micrel: backport ksz9031 125MHz ref-clk workaround
Date: Tue, 12 Feb 2019 21:39:12 +0100 [thread overview]
Message-ID: <20190212203912.hf2kok7lpgmy6wrp@pengutronix.de> (raw)
In-Reply-To: <20190211164400.14663-1-m.felsch@pengutronix.de>
On Mon, Feb 11, 2019 at 05:44:00PM +0100, Marco Felsch wrote:
> This patch backports linux commit e1b505a60366 ("net: phy: micrel: add
> 125MHz reference clock workaround").
>
> 8<--------------------- The original commit message -------------------
>
> net: phy: micrel: add 125MHz reference clock workaround
>
> The micrel KSZ9031 phy has a optional clock pin (CLK125_NDO) which can be
> used as reference clock for the MAC unit. The clock signal must meet the
> RGMII requirements to ensure the correct data transmission between the
> MAC and the PHY. The KSZ9031 phy does not fulfill the duty cycle
> requirement if the phy is configured as slave. For a complete
> describtion look at the errata sheets: DS80000691D or DS80000692D.
>
> The errata sheet recommends to force the phy into master mode whenever
> there is a 1000Base-T link-up as work around. Only set the
> "micrel,force-master" property if you use the phy reference clock provided
> by CLK125_NDO pin as MAC reference clock in your application.
>
> Attenation, this workaround is only usable if the link partner can
> be configured to slave mode for 1000Base-T.
>
> Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
> [m.felsch@pengutronix.de: fix dt-binding documentation]
> [m.felsch@pengutronix.de: use already existing result var for read/write]
> [m.felsch@pengutronix.de: add error handling]
> [m.felsch@pengutronix.de: add more comments]
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> 8<---------------------------------------------------------------------
>
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> ---
Applied, thanks
Sascha
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prev parent reply other threads:[~2019-02-12 20:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 16:44 Marco Felsch
2019-02-12 20:39 ` Sascha Hauer [this message]
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