lkml.org 
[lkml]   [2013]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] ARM: dts: omap4-panda-es: Do not reset gpio1
Date
Do not reset GPIO1 at boot-up because GPIO 7 in GPIO1 block is used on
OMAP4460 PandaBoard-ES to select voltage register in TPS62361 which
supplies VDD_MPU.

Without this, OMAP4460 PandaBoard-ES boards fail to boot-up because
MPU voltage switches over to VSET0 voltage value (boot voltage) which
is not sufficient to operate the device at OPP100.

Signed-off-by: Nishanth Menon <nm@ti.com>
---
As explained here: http://marc.info/?l=u-boot&m=133066647800872&w=2

GPIO1 reset causes PandaBoard-ES to stop functioning.
This depends on Patch series from Rajendra:
http://marc.info/?l=linux-doc&m=138131355520116&w=2
Applies on Benoit's for_13/dts branch:
https://git.kernel.org/cgit/linux/kernel/git/bcousson/linux-omap-dt.git/log/?h=for_3.13/dts

Tested on PandaBoard-ES without the u-boot uenv hack

arch/arm/boot/dts/omap4-panda-es.dts | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/omap4-panda-es.dts b/arch/arm/boot/dts/omap4-panda-es.dts
index 56c4354..816d1c9 100644
--- a/arch/arm/boot/dts/omap4-panda-es.dts
+++ b/arch/arm/boot/dts/omap4-panda-es.dts
@@ -62,3 +62,7 @@
gpios = <&gpio1 8 GPIO_ACTIVE_HIGH>;
};
};
+
+&gpio1 {
+ ti,no-reset-on-init;
+};
--
1.7.9.5


\
 
 \ /
  Last update: 2013-10-10 19:21    [W:0.056 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site