linux-kernel - [PATCH] ARM: dts: omap4-panda-es: Do not reset gpio1

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Date:	Thu, 10 Oct 2013 11:44:41 -0500
From:	Nishanth Menon <nm@...com>
To:	Benoît Cousson <bcousson@...libre.com>,
	Rajendra Nayak <rnayak@...com>
CC:	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>
Subject: [PATCH] ARM: dts: omap4-panda-es: Do not reset gpio1

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@...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

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