From: Shawn Guo <shawnguo@kernel.org>
To: Marco Felsch <m.felsch@pengutronix.de>
Cc: devicetree@vger.kernel.org,
Philipp Zabel <p.zabel@pengutronix.de>,
robh+dt@kernel.org, linux-imx@nxp.com, kernel@pengutronix.de,
c.hemp@phytec.de, fabio.estevam@nxp.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] ARM: dts: pfla02: add ksz9031 clock skew values
Date: Mon, 11 Feb 2019 10:36:40 +0800 [thread overview]
Message-ID: <20190211023639.GG22487@dragon> (raw)
In-Reply-To: <20190204152956.13471-2-m.felsch@pengutronix.de>
On Mon, Feb 04, 2019 at 04:29:56PM +0100, Marco Felsch wrote:
> From: Philipp Zabel <p.zabel@pengutronix.de>
>
> The pfla02 SoM has a Micrel KSZ9031RNX ethernet phy connected to the FEC,
> which needs RX and TX clock skew settings to compensate for differences
> in line length. The skew values are taken from barebox commit
> 4c65c20f1071 ("ARM: pfla02: Set new ethernet phy tx timings"), which
> is based on patches originally provided by Phytec:
>
> TX_CLK line is approx. 54mm longer than other TX lines which adds
> a delay of 0.36ns. RGMII need a delay of min. 1.0ns. This mean we
> have to add a delay of 0.64ns. We choose 0.78 to have a little gap.
> This can be done by setting GTX pad skew value to 11100
> Also add a delay for the RX delay lines, needed for the Duallite
> variant. => Set register 2.8 (RGMII Clock Pad Skew) to 0x039F.
>
> Cc: Christian Hemp <c.hemp@phytec.de>
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Applied, thanks.
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next prev parent reply other threads:[~2019-02-11 2:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 15:29 [PATCH 1/2] ARM: dts: pfla02: prepare storage devices to add paritions Marco Felsch
2019-02-04 15:29 ` [PATCH 2/2] ARM: dts: pfla02: add ksz9031 clock skew values Marco Felsch
2019-02-11 2:36 ` Shawn Guo [this message]
2019-02-11 10:36 ` Marco Felsch
2019-02-28 2:23 ` Shawn Guo
2019-02-12 7:12 ` [PATCH 1/2] ARM: dts: pfla02: prepare storage devices to add paritions Uwe Kleine-König
2019-02-28 2:26 ` Shawn Guo
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