From mboxrd@z Thu Jan 1 00:00:00 1970 From: merker@debian.org (Karsten Merker) Date: Wed, 12 Nov 2014 00:01:46 +0100 Subject: [PATCH V2 1/1] ARM: dts: sunxi: Banana Pi: increase startup-delay for the GMAC PHY regulator In-Reply-To: <1415746906-20835-1-git-send-email-merker@debian.org> References: <1415539714-7652-1-git-send-email-merker@debian.org> <1415746906-20835-1-git-send-email-merker@debian.org> Message-ID: <1415746906-20835-2-git-send-email-merker@debian.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Acked-by: Hans de Goede --- arch/arm/boot/dts/sun7i-a20-bananapi.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/sun7i-a20-bananapi.dts b/arch/arm/boot/dts/sun7i-a20-bananapi.dts index 3de847d..1cf1214 100644 --- a/arch/arm/boot/dts/sun7i-a20-bananapi.dts +++ b/arch/arm/boot/dts/sun7i-a20-bananapi.dts @@ -207,7 +207,7 @@ regulator-name = "gmac-3v3"; regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; - startup-delay-us = <50000>; + startup-delay-us = <100000>; enable-active-high; gpio = <&pio 7 23 0>; }; -- 1.7.10.4