This is 3.8+.
So is gpio2 = &gpio3? Then in my case, if my button lines are internally
pulled up and the keys short them to gnd, should i use:
gpios = <&gpio3 9 0x0>; ?
On May 19, 2015 4:04:30 PM Robert Nelson <[email protected]> wrote:
On Tue, May 19, 2015 at 8:51 AM, bremenpl <[email protected]> wrote:
> Hello there,
> I am trying to create a dts file for an 8 buttons keyboard. The pins I am
> using are:
> P8_35,
> P8_36,
> P8_39,
> P8_40,
> P8_41,
> P8_42,
> P8_43,
> P8_44
>
> HDMI is turned off. Using Dereks molloy book, I have found an example dts
> file for P9_15 key: https://pastebin.com/kKp3ji7s
>
> There are 2 main parts for me:
> pinctrl-single,pins = <
> 0x040 0x37 // P9_15 pull-up mode 7 GPIO1_16
>
> This first one is quite straight forward for me, I have chnaged it to my
> needs:
> pinctrl-single,pins = <
> 0x0d0 0x37 // P8_35 pull-up mode 7
> 0x0c8 0x37 // P8_36 pull-up mode 7
> 0x0b8 0x37 // P8_39 pull-up mode 7
> 0x0bc 0x37 // P8_40 pull-up mode 7
> 0x0b0 0x37 // P8_41 pull-up mode 7
> 0x0b4 0x37 // P8_42 pull-up mode 7
> 0x0a8 0x37 // P8_43 pull-up mode 7
> 0x0ac 0x37 // P8_44 pull-up mode 7
>
> The problem is I dont know how to config this part:
> button_P9_15 {
> debounce_interval = <50>;
> linux,code = <28>;
> label = "button9_15";
> gpios = <&gpio2 16 0x1>;
> gpio-key,wakeup;
> autorepeat;
>
> I dont know how to interpret "gpios = <&gpio2 16 0x1>;". I Think that 16 0x1
> stands for Gpio1[16], but I dont know what does &gpio2 stands for. Please
> correct me if I am wrong. What would be the configuration for the P8_44
> button? I tried "gpios = <&gpio2 9 0x2>;" but that did not work. The overlay
> loaded but the button doesnt work. It is wired correctly though. I Would
> aprichiate all help.
Well, first is this v3.8.x or anything later?
In 3.8.x: Gpio1[16] = &gpio2
while, in 3.14.x: Gpio1[16] = &gpio1 ;)
So for 3.8.x: GPIO1[16]
gpios = <&gpio2 16 0x1>;
&gpio2 = GPIO1
16 = 16
0x1: GPIO_ACTIVE_HIGH (0x0 = GPIO_ACTIVE_LOW)
Regards,
--
Robert Nelson
https://rcn-ee.com/
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