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Date: Tue, 7 Jul 2015 11:23:01 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Robert Nelson <robertcnelson@...il.com>,
Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>,
Johan Hovold <johan@...nel.org>,
Matthijs van Duin <matthijsvanduin@...il.com>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 071/102] ARM: dts: am335x-boneblack: disable RTC-only sleep to avoid hardware damage
3.19.8-ckt3 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Matthijs van Duin <matthijsvanduin@...il.com>
commit 7a6cb0abe1aa63334f3ded6d2b6c8eca80e72302 upstream.
Avoid entering "RTC-only mode" at poweroff. It is unsupported by most
versions of BeagleBone, and risks hardware damage.
The damaging configuration is having system-power-controller
without ti,pmic-shutdown-controller.
Reported-by: Matthijs van Duin <matthijsvanduin@...il.com>
Tested-by: Matthijs van Duin <matthijsvanduin@...il.com>
Signed-off-by: Robert Nelson <robertcnelson@...il.com>
Cc: Tony Lindgren <tony@...mide.com>
Cc: Felipe Balbi <balbi@...com>
Cc: Johan Hovold <johan@...nel.org>
[Matthijs van Duin: added explanatory comments]
Signed-off-by: Matthijs van Duin <matthijsvanduin@...il.com>
Fixes: http://bugs.elinux.org/issues/143
[tony@...mide.com: updated comments with the hardware breaking info]
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
arch/arm/boot/dts/am335x-bone-common.dtsi | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/arm/boot/dts/am335x-bone-common.dtsi b/arch/arm/boot/dts/am335x-bone-common.dtsi
index 2c6248d..7ecde1a 100644
--- a/arch/arm/boot/dts/am335x-bone-common.dtsi
+++ b/arch/arm/boot/dts/am335x-bone-common.dtsi
@@ -223,6 +223,25 @@
/include/ "tps65217.dtsi"
&tps {
+ /*
+ * Configure pmic to enter OFF-state instead of SLEEP-state ("RTC-only
+ * mode") at poweroff. Most BeagleBone versions do not support RTC-only
+ * mode and risk hardware damage if this mode is entered.
+ *
+ * For details, see linux-omap mailing list May 2015 thread
+ * [PATCH] ARM: dts: am335x-bone* enable pmic-shutdown-controller
+ * In particular, messages:
+ * http://www.spinics.net/lists/linux-omap/msg118585.html
+ * http://www.spinics.net/lists/linux-omap/msg118615.html
+ *
+ * You can override this later with
+ * &tps { /delete-property/ ti,pmic-shutdown-controller; }
+ * if you want to use RTC-only mode and made sure you are not affected
+ * by the hardware problems. (Tip: double-check by performing a current
+ * measurement after shutdown: it should be less than 1 mA.)
+ */
+ ti,pmic-shutdown-controller;
+
regulators {
dcdc1_reg: regulator@0 {
regulator-name = "vdds_dpr";
--
1.9.1
--
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