On Tue, Oct 14, 2014 at 4:46 PM, William Lear <wrl...@gmail.com> wrote:
> I am writing a device tree overlay file for a custom cape containing a
> touchscreen , and am having problems mapping a GPIO line as an interrupt to
> be handled by a device driver.
> I cannot get interrupt pulses on my GPIO line to invoke the ISR in the
> device driver.
>
> I have reached the limits of my BBB debug capabilities - I'm looking for any
> suggestions about how to find
> the disconnect between the pin and the ISR.
>
> Thanks,
> Bill
> -------------------------
> What I have so far:
> My .dts file compiles, is loaded, configures the pins. the driver maps its
> ISR to the IRQ obtained from devm_request_threaded_irq(),
> and I have verified with a scope that the hardware is generating Interrupt
> requests on the correct pin.
>
> The applicable fragments from my overlay are:
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> pinctrl-single,pins = <
> 0x90 0x37 /* INT gpio2_2, MODE7, INPUT,
> PULLUP */
> 0x44 0x17 /* RESET gpio1_17, MODE7, OUTPUT,
> PULLUP */
> >;
> };
> };
>
> fragment@1{
> target = <&i2c2>;
> __overlay__ {
> #address-cells = <1>;
> #size-cells = <0>;
> status = "okay";
>
> /* Capacitive Touch Panel */
> edt_ft5x06@38 {
> status = "okay";
> compatible = "edt,edt-ft5x06";
> /*compatible = "ft5x0x_ts";*/
> pinctrl-names = "default";
> pinctrl-0 = <&pharm_ctp_pins>;
>
> reg = <0x38>;
> interrupt-parent = <&gpio2>;
> interrupts = <2 1>;
>
> reset-gpios = <&gpio1 17 1>;
>
> touchscreen-size-x = <480>;
> touchscreen-size-y = <272>;
> };
> };
> };
>
> The pins are properly configured as confirmed by
> /sys/kernel/debug/pinctrl/44e10800.pinmux/*
> Debug prints in the driver confirms its probe function runs cleanly, and the
> ISR is never called.
> /proc/interrupts confirms that an IRQ is assigned as GPIO to the driver
> (with either compatible driver).
This is on 3.14 (note the &gpioX index was one off in v3.8.x)
https://github.com/RobertCNelson/dtb-rebuilder/blob/3.14-ti/src/arm/am335x-bone-bbb-exp-c.dtsi#L50
Regards,
--
Robert Nelson
http://www.rcn-ee.com/
--
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