iMX8MM and PCA6416 IO-Expander's output 8,9 ?

[khang_letruong]

Dear Community,

I expect to use EXP_IO8 and EXP_IO9 of PCA6416 on iMX8MM EVK as POWER-DOWN and RESET control for a camera sensor :

I imitated the use of PCA6416's outputs #1, #3, #4, #5 in arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi as below :

        reg_audio_board: regulator-audio-board {
                ...
                gpio = <&pca6416 1 GPIO_ACTIVE_HIGH>;
                regulator-always-on;
        };

        sound-ak4458 {
                ...
                reset-gpios = <&pca6416 4 GPIO_ACTIVE_LOW>;
        };

        ak5558: ak5558@13 {
                compatible = "asahi-kasei,ak5558";
                reg = <0x13>;
                reset-gpios = <&pca6416 3 GPIO_ACTIVE_LOW>;
                ...
        };

        ak4497: ak4497@11 {
                compatible = "asahi-kasei,ak4497";
                reg = <0x11>;
                reset-gpios = <&pca6416 5 GPIO_ACTIVE_LOW>;
                ...
        };

And used the output #8, #9 for my sensor's node in the custom dts :

+&i2c3 {
+       /delete-node/ov5640_mipi@3c;
+
+       adv728x_mipi1: adv728x_mipi1@21 {
+               compatible = "adi,adv7280-m";
+               reg = <0x21>;
+               csi_id = <0x00>;
+               status = "okay";
+
+               pwn-gpios = <&pca6416 8 GPIO_ACTIVE_LOW>;
+               rst-gpios = <&pca6416 9 GPIO_ACTIVE_LOW>;
+
+               port {
+                       adv728x_mipi1_ep: endpoint {
+                               remote-endpoint = <&mipi1_sensor_ep>;
+
+                               data-lanes = <1>;
+                               clock-lanes = <0>;
+                       };
+               };
+       };
+};

I always got the following error :

[    6.706860] adv7180 2-0021: request for power pin failed: -517
[    7.539305] adv7180 2-0021: request for power pin failed: -517

for the below code snippet :

        state->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "pwn",
                                                   GPIOD_OUT_HIGH);
        if (IS_ERR(state->pwdn_gpio)) {
                ret = PTR_ERR(state->pwdn_gpio);
                v4l_err(client, "request for power pin failed: %d\n", ret);
                return ret;
        }

Could someone tell me how I would be able to use the mentioned outputs, please ?

Thanks in advance and best regards,
Khang

[BiyongSUN]

Please try the camera senor module later than  subsys_initcall.

[khang_letruong]

Hi @BiyongSUN ,

Please try the camera senor module later than subsys_initcall.

Could you explain a little bit more how to do, please ?

Best regards,

K.

[BiyongSUN]

You try you camera as module. you build the camera driver as module not build in than manually insmod.

The you try the camera senor module later than subsys_initcall. Because the gpio expander driver using subsys_initcall.

[khang_letruong]

Dear @BiyongSUN ,

You try you camera as module. you build the camera driver as module not build in than manually insmod.

The you try the camera senor module later than subsys_initcall. Because the gpio expander driver using subsys_initcall.

From the beginning, the module has already been built as loadable module an it is loaded as the associated node is defined in the dts:

diff --git a/arch/arm64/configs/imx_v8_defconfig b/arch/arm64/configs/imx_v8_defconfig
index ab8c97e3dcb0..12b55c27cf34 100644
--- a/arch/arm64/configs/imx_v8_defconfig
+++ b/arch/arm64/configs/imx_v8_defconfig
@@ -528,6 +528,7 @@ CONFIG_SDR_PLATFORM_DRIVERS=y
 CONFIG_VIDEO_IMX219=m
 CONFIG_VIDEO_OV5640=y
 CONFIG_VIDEO_OV5645=m
+CONFIG_VIDEO_ADV7180=m
 CONFIG_IMX_DPU_CORE=y
 CONFIG_IMX_LCDIF_CORE=y
 CONFIG_IMX_LCDIFV3_CORE=y

But error still happened.

Best Regards,

Khang

[BiyongSUN]

here is my suggestion. 

Use the original dts. 

and use the the gpio in /sys/class/gpio from use space, first to narrow down the issue.

Accessing GPIO From UserSpace - NXP Community

[khang_letruong]

Hi,

Is there any idea, please ?

Best regards,
K.

[BiyongSUN]

I gave you idea, have you tried? 

try the camera senor module later than subsys_initcall.

It may because the gpio expander driver init later than the camera driver init.