On 06/16/2014 12:11 PM, Denis Carikli wrote:> + reg_lcd_3v3: lcd-en {
compatible = "regulator-fixed";pinctrl-names = "default";pinctrl-0 = <&pinctrl_reg_lcd_3v3>;regulator-name = "lcd-3v3";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;gpio = <&gpio3 13 GPIO_ACTIVE_HIGH>;regulator-boot-on;- };
+};
This is wrong, I'll fix it in the next serie.
What it really does is to make regulator-fixed think that the gpio is active low, the bindings documentation(fixed-regulator.txt) says:
- enable-active-high: Polarity of GPIO is Active high
If this property is missing, the default assumed is Active low.
Then regulator-boot-on will make it think that the regulator is already on and so the regulator will be disabled. From the bindings documentation (regulator.txt):
regulator-boot-on: bootloader/firmware enabled regulator
Which result at the lcd regulator being physically powered on at boot. I didn't see that because powering it on at boot is what I want.
How can I do that beside doing it in userspace by issuing the following commands: echo 4 > /sys/devices/display-subsystem/graphics/fb0/blank echo 0 > /sys/devices/display-subsystem/graphics/fb0/blank
Denis.