On Sat, Nov 6, 2021 at 12:22 AM Andreas Kemnade [off-list ref] wrote:

Hi,

I finally found time to test this.

On Wed,  3 Nov 2021 21:48:28 +1000
Alistair Francis [off-list ref] wrote:

[...]

quoted

+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@24 {
+            compatible = "cypress,tt2100";
+            reg = <0x24>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&tp_reset_ds203>;
+            interrupt-parent = <&pio>;
+            interrupts = <1 5 IRQ_TYPE_LEVEL_LOW>;

hmm, in the code is IRQ_TRIGGER_FALLING but here is LEVEL_LOW, hmm what
it is really?

The reMarkable uses IRQ_TYPE_EDGE_FALLING, but this example isn't
based on that. It' based on the original documentation from the patch
series.

quoted

+            reset-gpios = <&pio 7 1 GPIO_ACTIVE_HIGH>;

hmm, if the reset gpio at the chip is active low (I guess it is) that
would indicate an inverter between SoC and gpio. So a nonstandard setup
as an example, probably not a good idea.

It seems to be common for the cypress,tt2100, as the original
documentation and the rM2 both do this. Does the Kobo not do this?

Alistair

Regards,
Andreas