of_get_named_gpio_flags returns with -2 status

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of_get_named_gpio_flags returns with -2 status

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Contributor I

Hi,

I am interfacing TSC2004 touch screen controller with imx6q. I have compiled the image using build root and able to communicate with controller using i2c. interrupt of the controller is mapped to GPIO, i have specified the same in dtb file.

but when probe function is executed it calls "of_get_named_gpio_flags" which return with -2. The same value is passed to "gpio_is_valid" function further which in turn return error. 

Any help would be appreciated.

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NXP TechSupport
NXP TechSupport

Hi  surajkumar

this may be due to wrong gpio name or assignment, please check

boundary devices TSC2004 example in imx6qdl-sabrelite.dtsi :
https://github.com/boundarydevices/linux-imx6/blob/boundary-imx_4.1.15_1.0.0_ga/arch/arm/boot/dts/im...

Best regards
igor
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Contributor I

Hi igorpadykov ,

Thanks for reply,

As suggested by you i was assigning wrong pin which physically it was connected to interrupt. But now i have change but still problem persist.

Below is the imx6qdl-sabrelite.dtsi changes i made.

ORIGINAL

pinctrl_i2c3_tsc2004: i2c3-tsc2004grp {
        fsl,pins = <
#define GPIRQ_TSC2004        <&gpio4 20 IRQ_TYPE_EDGE_FALLING>
#define GP_TSC2004        <&gpio4 20 GPIO_ACTIVE_LOW>  
            MX6QDL_PAD_DI0_PIN4__GPIO4_IO20         0x1b0b0        /* tsc2004 interrupt */
        >;
    };

CHNANGED

pinctrl_i2c3_tsc2004: i2c3-tsc2004grp {
        fsl,pins = <
#define GPIRQ_TSC2004        <&gpio1 09 IRQ_TYPE_EDGE_FALLING>
#define GP_TSC2004        <&gpio1 09 GPIO_ACTIVE_LOW>  

            MX6QDL_PAD_GPIO_9__GPIO1_IO09  0x1b0b0
        >;
    };

Physically interrupt from the tsc controller is connected to GPIO9 (which is not multiplexed).

The above change is valid or any correction is required.

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