Add VTT regulators for DDR3 AMx3xx Boards

The am335x-evmsk and am437x-gp-evm both have a gpio controlled regulator for DDR3 VTT voltage. This is configured by boot loader and previously just left at that but it is better to define a fixed regulator to control the gpio so that the kernel is aware of it.

Previous discussion here [1].

Original am437x-gp-evm patch has been updated to reflect actual voltage supplied by VTT regulator.

Regards,
Dave

[1] http://marc.info/?l=linux-omap&m=139819277623028&w=2

Dave Gerlach (2):
ARM: dts: am437x-gp-evm: Add vtt_fixed regulator
ARM: dts: am335x-evmsk: Add vtt_fixed regulator

 arch/arm/boot/dts/am335x-evmsk.dts  | 11 +++++++++++
 arch/arm/boot/dts/am437x-gp-evm.dts | 11 +++++++++++
 2 files changed, 22 insertions(+)

1.9.0

The VTT regulator for DDR3 termination on the am437x-gp-evm is controlled by a gpio. It is configured by the bootloader so here we define an always-on, fixed voltage regulator to hold the gpio.

---
 arch/arm/boot/dts/am437x-gp-evm.dts | 11 +++++++++++
 1 file changed, 11 insertions(+)

index df8798e..6e61e42 100644
@@ -27,6 +27,17 @@
 		enable-active-high;
 	};
 
+	vtt_fixed: fixedregulator-vtt {
+		compatible = "regulator-fixed";
+		regulator-name = "vtt_fixed";
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+		regulator-always-on;
+		regulator-boot-on;
+		enable-active-high;
+		gpio = <&gpio5 7 GPIO_ACTIVE_HIGH>;
+	};
+
 	backlight {
 		compatible = "pwm-backlight";
 		pwms = <&ecap0 0 50000 PWM_POLARITY_INVERTED>;

1.9.0

The VTT regulator for DDR3 termination on the am335x-evmsk is controlled by a gpio. It is configured by the bootloader so here we define an always-on, fixed voltage regulator to hold the gpio.

---
 arch/arm/boot/dts/am335x-evmsk.dts | 11 +++++++++++
 1 file changed, 11 insertions(+)

index ab23885..d6b8acb 100644
@@ -57,6 +57,17 @@
 		enable-active-high;
 	};
 
+	vtt_fixed: fixedregulator at 3 {
+		compatible = "regulator-fixed";
+		regulator-name = "vtt";
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+		gpio = <&gpio0 7 GPIO_ACTIVE_HIGH>;
+		regulator-always-on;
+		regulator-boot-on;
+		enable-active-high;
+	};
+
 	leds {
 		pinctrl-names = "default";
 		pinctrl-0 = <&user_leds_s0>;

1.9.0

Thanks applying both into omap-for-v3.16/dt.

Tony