Patch "ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator" has been added to the 4.6-stable tree

Patch "ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator" has been added to the 4.6-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator

to the 4.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-dts-sun6i-primo81-drop-constraints-on-dc1sw-regulator.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cb84f6c0a25eb76b1f838eb63e212705c0c06b5f Mon Sep 17 00:00:00 2001
From: Chen-Yu Tsai <wens@csie.org>
Date: Wed, 11 May 2016 13:23:13 +0800
Subject: ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator

From: Chen-Yu Tsai <wens@csie.org>

commit cb84f6c0a25eb76b1f838eb63e212705c0c06b5f upstream.

This is the same issue fixed in commit dcf5341f0150 ("ARM: dts:
sun8i-q8-common: Do not set constraints on dc1sw regulator").
Commit message copied:

dc1sw is an on/off only regulator and as such it cannot have constraints.

This is a limitation of the kernel regulator implementation which resolves
supplies on the first regulator_get(), which is done after applying
constraints, and applying the constrains will fail because it calls
_regulator_get_voltage() and _regulator_do_set_voltage() both of which
will fail on a switch regulator when there is no supply (yet).

This causes registering of all axp22x regulators to fail with the
following errors:

[    1.395249] vcc-lcd: failed to get the current voltage(-22)
[    1.405131] axp20x-regulator axp20x-regulator: Failed to register dc1sw
[    1.412436] axp20x-regulator: probe of axp20x-regulator failed with error -22

This commit removes the constrains on dc1sw / vcc-lcd fixing this problem.
Note that dcdc1 itself is contrained to the exact same values, so this
does not change anything.

Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/boot/dts/sun6i-a31s-primo81.dts |    2 --
 1 file changed, 2 deletions(-)

--- a/arch/arm/boot/dts/sun6i-a31s-primo81.dts
+++ b/arch/arm/boot/dts/sun6i-a31s-primo81.dts
@@ -176,8 +176,6 @@
 };
 
 &reg_dc1sw {
-	regulator-min-microvolt = <3000000>;
-	regulator-max-microvolt = <3000000>;
 	regulator-name = "vcc-lcd";
 };
 


Patches currently in stable-queue which might be from wens@csie.org are

queue-4.6/arm-dts-sun6i-primo81-drop-constraints-on-dc1sw-regulator.patch
queue-4.6/arm-dts-sun6i-yones-toptech-bs1078-v2-drop-constraints-on-dc1sw-regulator.patch