The usart1 has issue with PZ6 and PZ7

[SChen.11]

Hi all, I use PZ7 and PZ6 configure for usart1. But it show some error log.

[ 1.633566] stm32mp157-pinctrl soc:pin-controller@50002000: invalid function.
[ 1.640375] stm32-usart: probe of 5c000000.serial failed with error -22

It's right when II try to use another pins . Did you also had this issue?

[PatrickF]

Would be easier to support if you provide the DeviceTree.

Meanwhile, some clues

• 50002000 is GPIOA, normal ?
• Please check if you have not duplicated of same GPIO definition in the DT

[SChen.11]

Thanks for your quick response. Below is my dts code. And I also enable all uart/usart in dts, only the usart1 had error.

 339 uart1_pins_a: uart1-0 {
 340 pins1 {
 341 pinmux = <STM32_PINMUX('Z', 7, AF7)>; /* USART1_TX */
 342 bias-disable;
 343 drive-push-pull;
 344 slew-rate = <0>;
 345 };
 346 pins2 {
 347 pinmux = <STM32_PINMUX('Z', 6, AF7)>; /* USART1_RX */
 348 bias-disable;
 349 };
 350 };
 
 856 &usart1 {
 857 pinctrl-names = "default", "sleep", "idle";
 858 pinctrl-0 = <&uart1_pins_a>;
 859 pinctrl-1 = <&uart1_sleep_pins_a>;
 860 pinctrl-2 = <&uart1_idle_pins_a>;
 861 status = "okay";
 862 };

[PatrickF]

I assume the nodes "uart1_sleep_pins_a" and "uart1_idle_pins_a" are defined elsewhere. otherwise, try to remove the "pinctrl-1" and "pinctrl-2" lines.

Please check if USART1 is defined as non-secure in etzpc node of TF-A Device Tree?

[JKlei.1]

Hi,

I had the same problem. I muxed the pins in uboot and delete the muxing in devicetree.

After this the uasrt1 works fine.

Seems to be an issue in the pinctrl driver.