AM625: LP5521 driver failed to load with error -22

Vijay Gawade

Part Number: AM625
Other Parts Discussed in Thread: LP5521

Tool/software:

we are trying to configure LED driver for RGB Indicator in AM625

we have configured RGB pin as GPIO and also configured I2C_2 on which it communicates. we have build LP5521 driver as module as well load after system boot manually.

Here are my changes:

SOM Datasheet: https://www.variscite.com/wp-content/uploads/2023/01/VAR-SOM-AM62_Datasheet.pdf

Device Tree:- https://github.com/varigit/ti-linux-kernel/blob/ti-linux-6.1.y_09.02.01.10_var01/arch/arm64/boot/dts/ti/k3-am625-var-som-symphony.dts

arch/arm/dts/k3-am625-var-som-symphony.dts

&main_pmx0 {
    /* RGB Health Indicator */
    lp5521_pins_default: lp5521-default-pins {
     pinctrl-single,pins = <
        AM62X_IOPAD(0x0020, PIN_OUTPUT, 7) /* (J25) OSPI0_D5.GPIO0_8 */
     >;
    };



    rgb_health_i2c2_pins_default: rgb-health-i2c2-pins-default {
     pinctrl-single,pins = <
        AM62X_IOPAD(0x00b0, PIN_INPUT_PULLUP, 1) /* (K22) GPMC0_CSn2.I2C2_SCL */
        AM62X_IOPAD(0x00b4, PIN_INPUT_PULLUP, 1) /* (K24) GPMC0_CSn3.I2C2_SDA */
     >;
    };
};



&main_i2c2 {
    pinctrl-names = "default";
    pinctrl-0 = <&rgb_health_i2c2_pins_default>;
    clock-frequency = <100000>;
    status = "okay";



    /* RGB health indicator @32 */
    lp5521: led-controller@32 {
     compatible = "ti,lp5521";
     reg = <0x32>;
     status = "okay";
     pinctrl-names = "default";
     label = "lp5521_pri";
     pinctrl-0 = <&lp5521_pins_default>;
     enable-gpios = <&main_gpio0 8 GPIO_ACTIVE_HIGH>;
     // reset-gpio = <&main_gpio0 10 GPIO_ACTIVE_HIGH>;



     // Define LED channels with default brightness
     led@0 {
        label = "lp5521:red";
        reg = <0>; // Channel 0
        default-state = "on";   // Can be "on", "off", or "keep"
        max-brightness = <0x5f>; // Maximum value
        brightness = <0x2f>;    // Default brightness
     };



     led@1 {
        label = "lp5521:green";
        reg = <1>;
        default-state = "on";
        max-brightness = <0x5f>;
        brightness = <0x2f>;
     };



     led@2 {
        label = "lp5521:blue";
        reg = <2>;
        default-state = "on";
        max-brightness = <0x5f>;
        brightness = <0x2f>;
     };
    };
};

arch/arm64/configs/am62x_var_defconfig

CONFIG_LEDS_CLASS_MULTICOLOR=y
CONFIG_LEDS_LP55XX_COMMON=y
CONFIG_LEDS_LP5521=m // Also try with 'y' option
CONFIG_I2C=y
CONFIG_I2C_CHARDEV=y

Console Output:

After setting GPIO0_8 set to HIGH, LP5521 device detect on I2C 2 bus as shown above but when we try to load driver it failed with error message:
lp5521: probe of 2-0032 failed with error -22

over 1 year ago

0 Vijay Gawade over 1 year ago

Prodigy 60 points

I have also tried older syntax for defining lp5521 device node in device tree:

lp5521: lp5521@32 {   // device address
        compatible = "national,lp5521";
        reg = <0x32>;
        label = "lp5521_led";
        clock-mode = /bits/ 8 <1>;   // 0: automode, 1: internal clock, 2: external clock
        enable-gpio = <&gpio0 8 GPIO_ACTIVE_HIGH>;  // GPIO bank, pin and active level - adjust according to your setup

        chan0 {
            led-cur = /bits/ 8 <0x2f>;  // LED channel current setting (mA x10, 0 if LED not connected)
            max-cur = /bits/ 8 <0x5f>;  // Maximum LED channel current 
            linux,default-trigger = "none";
        };
        chan1 {
            led-cur = /bits/ 8 <0x2f>;
            max-cur = /bits/ 8 <0x5f>;
            linux,default-trigger = "none";
        };
        chan2 {
            led-cur = /bits/ 8 <0x2f>;
            max-cur = /bits/ 8 <0x5f>;
            linux,default-trigger = "none";
        };
    };

0 Vijay Gawade over 1 year ago in reply to Vijay Gawade

Prodigy 60 points

After adding debug statements into error code return at below location:
https://github.com/varigit/ti-linux-kernel/blob/ti-linux-6.1.y_09.02.01.10_var01/drivers/leds/leds-lp5521.c

+1 Anshu Madwesh over 1 year ago in reply to Vijay Gawade

TI__Mastermind 24325 points

Hello,

Which Linux SDK version are you using?

Since this LED driver not a TI EVM, this product has not been validated that it will work with a TI processor. That means some experimenting may be required.

From a quick search, you can see an example using the LP5521, but the dts doesn't come from a TI product so TI hasn't tested this: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm/boot/dts/st/ste-href.dtsi?h=ti-linux-6.6.y#n83

Has the following include statements been added to the dts?

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/leds/common.h>

Best Regards,

Anshu

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AM625: LP5521 driver failed to load with error -22