Re: <Query> Reg: Adding a gpio initialization sequence in dts is valid or not

On 08/17/2012 04:37 AM, Leela Krishna Amudala wrote:

Hello,

I think you misinterpreted my question.

...

But I don't bother about enabling regulator and pwm for my panel.

My panel needs a sequence like
1. Pull up a gpio line
2. Maintain some delay
3. Pull down gpio line
4. Maintain some delay and
5. Pull up a gpio line.

Yes, I think that kind of thing is exactly what the power sequences
bindings/driver are for.

But ...

Please find the Image shown in the attachment for better understanding.

So, to get this done I used your code and created a node like below
and it worked for me.

backlight {
        compatible = "pwm-backlight";
        brightness-levels = <0 16 32 48 64 80 96 112 128 144 160 176
192 208 224 240 255>;
        default-brightness-level = <12>;

        enable-gpio1 = <&gpx1 5 1 0 0>;
        enable-gpio2 = <&gpx3 0 0 0 0>;

In your original email, you mentioned that some of those cells for the
GPIO control the state features such as pull-up/-down and
drive-strength. Those two features should really be configured by
pinctrl not by the GPIO bindings, although that's a comment on the GPIO
bindings itself, and nothing to do with power sequences.