ARM: dts: exynos: Add LDO28 regulator on Exynos5422 Odroid boards

The LDO28 is used only on Odroid XU3 for Display Port.  Define it so DTS
will describe entire hardware.

Depending on bootloader behavior this might affect the Display Port
because none of drivers are enabling it. By default it is off in S2MPS11
PMIC reset values.  However it could be enabled by bootloader so in such
case kernel will later disable it as unused regulator.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
[backport of mainline commit 8be3e7f0785c2258479aab26c926ed9be6b9a799]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: I646826a349ca66544cafcf7749a1b27416073017

diff --git a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
index 50f40c1..472502a 100644 (file)
--- a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi
@@ -343,6 +343,13 @@
                                regulator-always-on;
                        };
 
+                       ldo28_reg: LDO28 {
+                               /* Used on XU3 */
+                               regulator-name = "vdd_ldo28";
+                               regulator-min-microvolt = <800000>;
+                               regulator-max-microvolt = <3950000>;
+                       };
+
                        ldo29_reg: LDO29 {
                                /* Unused */
                                regulator-name = "vdd_ldo29";

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3.dts b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
index 2df6af3..3d1541a 100644 (file)
--- a/arch/arm/boot/dts/exynos5422-odroidxu3.dts
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3.dts
@@ -52,6 +52,12 @@
        };
 };
 
+&ldo28_reg {
+       regulator-name = "dp_p3v3";
+       regulator-min-microvolt = <3300000>;
+       regulator-max-microvolt = <3300000>;
+};
+
 &pwm {
        /*
         * PWM 0 -- fan