On Fri, Aug 7, 2015 at 3:06 PM, Doug Anderson <dianders at chromium.org> wrote:
> Heiko,
>
> On Thu, Aug 6, 2015 at 10:37 AM, Heiko St?bner <heiko at sntech.de> wrote:
>> +&i2c3 {
>> + status = "okay";
>> +
>> + /*
>> + * Touchscreen pin control is shared between Atmel and Elan devices,
>> + * so we have to pull it up to the bus level.
>> + */
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&i2c3_xfer &touch_int &touch_rst>;
>> +
>> + clock-frequency = <400000>;
>> + i2c-scl-falling-time-ns = <50>;
>> + i2c-scl-rising-time-ns = <300>;
>> +
>> + touchscreen at 10 {
>> + compatible = "elan,ekth3500";
>> + reg = <0x10>;
>> + interrupt-parent = <&gpio2>;
>> + interrupts = <14 IRQ_TYPE_EDGE_FALLING>;
>> + reset-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
>> + vcc33-supply = <&vcc33_touch>;
>> + vccio-supply = <&vcc33_touch>;
>> + };
>> +
>> + touchscreen at 4a {
>> + compatible = "atmel,atmel_mxt_ts";
>> + reg = <0x4a>;
>> + atmel,reset-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
>> + avdd-supply = <&vcc5v_touch>;
>> + interrupt-parent = <&gpio2>;
>> + interrupts = <14 IRQ_TYPE_EDGE_FALLING>;
>> + vdd-supply = <&vcc33_touch>;
>
> Technically I don't think most of these properties exist upstream, but
> Dmitry (now CCed) might know more.
>
> ...actually similar for elan. At least I don't see 'reset-gpios', nor
> 'vcc33-supply' and 'vccio-supply' in the bindings when I checkout
> linuxnext...
>
I just merged the Elan regulator/gpio support, it will show up in the next next.
> Oh, and also locally our tree has hacks in it to handle the fact that
> both atmel and elan will try to grab the same reset GPIO. I'm nearly
> certain that Dmitry said that the current hacks we have wouldn't be
> appropriate for upstream. I had some proposals for better solutions,
> but they were slightly more controversial. In any case, I think all
> shipping devices ended up using one or the other of these two
> touchscreens (I forget which), so you could probably simplify and just
> pick one of them. If old prototype devices don't work upstream it
> wouldn't be the end of the world.
I think if you pick Elan for this board it will cover majority (all?)
devices that actually shipped.
Thanks.
--
Dmitry
