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

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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>
This commit is contained in:
Ulrich Ölmann 2022-05-17 09:18:14 +02:00 committed by Shawn Guo
parent 71b81f1cac
commit 4c2f2775ab
2 changed files with 16 additions and 0 deletions
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6
arch/arm/boot/dts/imx6q-skov-reve-mi1010ait-1cp1.dts
View File

@ -125,3 +125,9 @@
>;
};
};
&reg_tft_vcom {
regulator-min-microvolt = <3160000>;
regulator-max-microvolt = <3160000>;
voltage-table = <3160000 73>;
};

10
arch/arm/boot/dts/imx6qdl-skov-cpu.dtsi
View File

@ -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";