External SPI Flash Clock not being set for M4, Zephyr driver

[Simon33rd]

Hi All,

I've had the external SPI Flash driver working on the STM32H745_M7, using Zephyr SDK 4.0.0.

But when I setup it up on the M4 side the driver initialization is failing with error:

[1;31m<err> spi_ll_stm32: Could not select SPI domain clock

Further investigation shows that stm32_clock_control_configure(), is called from spi_stm32_init(), and fails to setup the clock path.  In particular it is seeing that PLL_Q clock is not enabled.  PLL 1 is setup on the M7 side and it doesn't look like I should be enabling it again in the M4's device tree again.

How do I get the correct clock path setup for the SPI driver on the M4 side? I need to run the external SPI flash from the M4.

Thanks,

Simon

[Sarra.S]

Hello @Simon33rd, Could you share the dts for the M4 side?

[Simon33rd]

Hi Sarra,

My board .dts settings and the resulting build zephyr.dts attached.

I did also try and use PLL3 given that PLL1 is setup on the M7 side, but I still get the same error.

by the way what is  < &rcc 0x9 0xec50 > doing? I can see the first part is enabling SPI123 clock.

clocks = < &rcc 0xf0 0x1000 >, < &rcc 0x9 0xec50 >;