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STM32MP135 NO BACKLIGHT

batuhanky
Associate II

Hi Everyone,

I have problem with custom carrier and dts. I am using MP135 SoM from PHYTEC and when I add panel backlight property to the panel node, there is no pwm output, but when I comment out this feature from the panel node, the panel backlight works as expected. Can you check my dts? I am using a generic RGB display. This is my working dts:

#include "stm32mp1-phycore-custom-carrier.dtsi" / { model = "CUSTOM CARRIER"; compatible = "phytec,stm32mp135f-pbacd10", "phytec,stm32mp135f-pcl076-emmc", "phytec,stm32mp135f-pcl076", "st,stm32mp135"; memory@c0000000 { reg = <0xc0000000 0x20000000>; }; reserved-memory { #address-cells = <1>; #size-cells = <1>; ranges; optee_framebuffer@dd000000 { reg = <0xdd000000 0x1000000>; no-map; }; optee@de000000 { reg = <0xde000000 0x2000000>; no-map; }; }; panel_rgb: rgb-panel { compatible = "panel-dpi"; label = "dt304b-lcd"; reset-gpios = <&gpioi 0 GPIO_ACTIVE_HIGH>; //backlight = <&panel_backlight>; data-mapping = "bgr666"; status = "okay"; width-mm = <115>; height-mm = <80>; port { panel_in_rgb: endpoint { remote-endpoint = <&ltdc_ep0_out>; }; }; //SATOZ 4.3INCH PANEL TIMINGS panel-timing { clock-frequency = <9000000>; hactive = <480>; vactive = <272>; hfront-porch = <8>; hback-porch = <43>; hsync-len = <4>; vback-porch = <12>; vfront-porch = <8>; vsync-len = <4>; }; }; panel_backlight: panel-backlight { compatible = "pwm-backlight"; status = "okay"; pwms = <&pwm_8 2 50000 0>; enable-gpios = <&gpiob 1 GPIO_ACTIVE_HIGH>; power-supply = <&scmi_vdd>; brightness-levels = <0 4 8 16 32 64 128 255>; default-brightness-level = <6>; }; user-leds { compatible = "gpio-leds"; sys-green-led { gpios = <&gpiob 13 GPIO_ACTIVE_HIGH>; linux,default-trigger = "heartbeat"; }; sys-red-led { gpios = <&gpiob 5 GPIO_ACTIVE_HIGH>; linux,default-trigger = "gpio"; default-state = "on"; }; }; }; &ltdc { pinctrl-names = "default", "sleep"; pinctrl-0 = <&ltdc_pins_mx>; pinctrl-1 = <&ltdc_sleep_pins_mx>; status = "okay"; port { #address-cells = <1>; #size-cells = <0>; ltdc_ep0_out: endpoint@0 { reg = <0>; remote-endpoint = <&panel_in_rgb>; }; }; }; &timers8 { /delete-property/dmas; /delete-property/dma-names; status = "okay"; pwm_8: pwm { pinctrl-0 = <&tim8_pwm_pins_mx>; pinctrl-1 = <&tim8_pwm_sleep_pins_mx>; pinctrl-names = "default", "sleep"; status = "okay"; }; }; &i2c5 { /delete-node/i2c_rtc; /delete-node/tlv320; goodix: goodix_ts@14 { compatible = "goodix,gt911"; reg = <0x14>; interrupt-parent = <&gpiof>; interrupts = <5 IRQ_TYPE_EDGE_FALLING>; interrupt-controller; reset-gpios = <&gpiog 12 GPIO_ACTIVE_LOW>; touchscreen-size-x = <480>; touchscreen-size-y = <272>; status = "okay"; }; };
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