linux-kernel - [PATCH 4.6 064/203] ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator

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Message-Id: <20160725203431.901530416@linuxfoundation.org>
Date:	Mon, 25 Jul 2016 13:54:39 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>
Subject: [PATCH 4.6 064/203] ARM: dts: sun6i: primo81: Drop constraints on dc1sw regulator

4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chen-Yu Tsai <wens@...e.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@...hat.com>
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Olof Johansson <olof@...om.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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";
 };