Hi All,
I am using MPR121 and it is not registering into the Kernel.
I am using Kernel Version: 3.10.53 and Android system. Bare-metal minimal FS I have.
I have made modifications in 'dtsi' file for MPR121.
Modification:
1.
i2c_mpr: mpr121@5a {
/*pinctrl-names = "default";*/
/*pinctrl-0 = <&pinctrl_key_int>;*/
compatible = "fsl,mpr121", "fsl,mpr121_touchkey";
reg = <0x5a>;
/* GPIO7_IO02 - SD3_CMD - X17.25 */
interrupts = <2 4>;
interrupt-parent = <&gpio7>;
status = "okay";
};
---------------------------------
2.
i2c_mpr: mpr121@5a {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_key_int>;
compatible = "fsl,mpr121", "fsl,mpr121_touchkey";
reg = <0x5a>;
/* GPIO7_IO02 - SD3_CMD - X17.25 */
interrupts = <2 4>;
interrupt-parent = <&gpio7>;
status = "okay";
};
'pinctrl_key_int' node entry in '&iomuxc':
pinctrl_key_int: gpiokeyintgrp {
fsl,pins = <MX6QDL_PAD_SD3_CMD__SD3_CMD 0x80000000>;
};
Connect SDA and SCL pins of MPR121 on I2C1 channel and GPIO7_IO12 as an IRQ pin.
But, in user space I am not getting any input node (e.g. input0 or input1).
I am getting the MPR121 device entry is user space '/sys/class/i2c-dev/i2c-0/devices/0-005a'.
My question is, How can I check and verify that MPR121 is registered in the system or ready-to-communicate from sysfs?
Is there any node definitional or parameter I am missing in dtsi file?
Is this correct way to define IRQ in dtsi file?
Please share your suggestions and comments.
Thanks,
