Gpio pin configuration for imx8mp

[Ajayvk]

I have a imx8mp board where I need to configure the gpio4_io28 pin as output and high so how to configure it as a output and high &iomuxc {
              pinctrl_csi0_rst: csi0_rst_grp {
                              fsl,pins = <
                                             MX8MP_IOMUXC_GPIO4_IO28__GPIO4_IO28  0x19
                                              >;
            };
};

[Chavira]

Hi @Ajayvk!

The configuration should be:

MX8MP_IOMUXC_SAI3_RXF__GPIO4_IO28 0x150

on your node of csi0_rst you have to add the lines:

gpios = <&gpio4 28 GPIO_ACTIVE_HIGH>;
default-state = "on";

Best Regards!

Chavira

[Ajayvk]

Thank you for the information  @Chavira can you please provide  the more details how you have given this address as with 0x150 the direction will remain as input high only .but i need direction to be output .In the given address the 8th bit =1 and 6th bit =1 which will configure pull-enable and weak pull up .But i need high with output direction please provide the information to configure as output with high 

[Chavira]

Hi @Ajayvk!

Sorry, I misunderstood the purpose of your application!

You want to use the GPIO4_IO28 as a CSI reset.

The pinctrl is ok should be:

pinctrl_csi0_rst: csi0_rst_grp {
fsl,pins = <
MX8MP_IOMUXC_SAI3_RXF__GPIO4_IO28 0x150
>;
};
};

On the CSI device you have to configure a reset like this:

reset-gpios = <&gpio4 28 GPIO_ACTIVE_LOW>;

You can get based on the device tree of our board:

https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/arch/arm64/boot/dts/freescale/imx8mp-evk.dts#L578...

After that, you have the pin as an output in High state.

Best Regards!
Chavira