ARM: dts: imx6: skov: add pwm-regulator to control the panel's VCOM

Skov's i.MX6 based boards come in different flavors which have different panels
attached. For optimal contrast experience each panel type needs an individual
common voltage (VCOM) to drive its TFT backplane. The latter is generated by an
LCD bias supply IC controlled by a pwm as input signal. Introduce a pwm-
regulator to describe this hardware property and parameterize it appropriately
for the different boards.

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6q-skov-reve-mi1010ait-1cp1.dts b/arch/arm/boot/dts/imx6q-skov-reve-mi1010ait-1cp1.dts
index 7f1f19b..a3f247c 100644 (file)
--- a/arch/arm/boot/dts/imx6q-skov-reve-mi1010ait-1cp1.dts
+++ b/arch/arm/boot/dts/imx6q-skov-reve-mi1010ait-1cp1.dts
@@ -125,3 +125,9 @@
                >;
        };
 };
+
+&reg_tft_vcom {
+       regulator-min-microvolt = <3160000>;
+       regulator-max-microvolt = <3160000>;
+       voltage-table = <3160000 73>;
+};

diff --git a/arch/arm/boot/dts/imx6qdl-skov-cpu.dtsi b/arch/arm/boot/dts/imx6qdl-skov-cpu.dtsi
index 77a91a9..3def1b6 100644 (file)
--- a/arch/arm/boot/dts/imx6qdl-skov-cpu.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-skov-cpu.dtsi
@@ -149,6 +149,16 @@
                gpio = <&gpio4 11 GPIO_ACTIVE_LOW>;
        };
 
+       reg_tft_vcom: regulator-tft-vcom {
+               compatible = "pwm-regulator";
+               pwms = <&pwm3 0 20000 0>;
+               regulator-name = "tft_vcom";
+               regulator-min-microvolt = <3600000>;
+               regulator-max-microvolt = <3600000>;
+               regulator-always-on;
+               voltage-table = <3600000 26>;
+       };
+
        reg_vcc_mmc: regulator-vcc-mmc {
                compatible = "regulator-fixed";
                pinctrl-names = "default";