From: maxime.ripard@free-electrons.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2 1/1] ARM: dts: sunxi: Banana Pi: increase startup-delay for the GMAC PHY regulator
Date: Wed, 12 Nov 2014 14:37:27 +0100 [thread overview]
Message-ID: <20141112133727.GO14919@lukather> (raw)
In-Reply-To: <1415746906-20835-2-git-send-email-merker@debian.org>
On Wed, Nov 12, 2014 at 12:01:46AM +0100, Karsten Merker wrote:
> On the LeMaker Banana Pi, probing the external ethernet PHY connected
> to the SoC's internal GMAC module sometimes fails. The PHY power
> supply is handled via a GPIO-controlled regulator, and the existing
> regulator startup-delay of 50000us is too short to make sure that the
> PHY is always fully powered up when it is queried by phylib. Tests
> have shown that to provide a reliable PHY detection, the startup-delay
> has to be increased to at least 60000us. To have a certain safety margin
> and to cater for manufacturing variations between different boards,
> the delay gets set to 100000us as discussed on the linux-arm-kernel
> mailinglist.
>
> Signed-off-by: Karsten Merker <merker@debian.org>
> Acked-by: Hans de Goede <hdegoede@redhat.com>
Merged, thanks.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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prev parent reply other threads:[~2014-11-12 13:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-09 13:28 [PATCH] ARM: dts: Fix failing ethernet PHY detection on the LeMaker Banana Pi Karsten Merker
2014-11-09 13:28 ` [PATCH] ARM: dts: sunxi: Banana Pi: increase startup-delay for the GMAC PHY regulator Karsten Merker
2014-11-09 21:05 ` Hans de Goede
2014-11-11 17:34 ` Maxime Ripard
2014-11-11 18:35 ` Hans de Goede
2014-11-11 23:01 ` [PATCH V2 0/1] ARM: dts: Fix failing ethernet PHY detection on the LeMaker Banana Pi Karsten Merker
2014-11-11 23:01 ` [PATCH V2 1/1] ARM: dts: sunxi: Banana Pi: increase startup-delay for the GMAC PHY regulator Karsten Merker
2014-11-12 13:37 ` Maxime Ripard [this message]
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