[PATCH v4 2/4] clk: imx8mq: Add a clock driver for the imx8mq

[Angus Ainslie]

Hi Heiko,

On 2022-03-15 08:35, Heiko Thiery wrote:
> Hi Angus and all,
>
>
>
>
> Am Di., 15. März 2022 um 14:09 Uhr schrieb Angus Ainslie <angus at akkea.ca>:
>
>     This is a DM clock driver based off the imx8mm u-boot driver and
>     the linux
>     kernel driver.
>
>     All of the PLLs and clocks are initialized so the subsystems below are
>     functional and tested.
>
>     1) USB host and peripheral
>     2) ECSPI
>     3) UART
>     4) I2C all busses
>     5) USDHC for eMMC support
>     6) USB storage
>     7) GPIO
>     8) DRAM
>
>
Snip
>
> when adding this patch and enabling CLK_IMX8MQ I see the following on 
> my board .. Any idea what I missed here?
>
> --- >8 ---
> U-Boot SPL 2022.04-rc4-00008-g390d9bf9a1 (Mar 15 2022 - 16:26:59 +0100)
> Trying to boot from SD card
>
>
> U-Boot 2022.04-rc4-00008-g390d9bf9a1 (Mar 15 2022 - 16:26:59 +0100)
>
> CPU:   Freescale i.MX8MQ rev2.1 at 800 MHz
> Reset cause: POR
> Model: Kontron pITX-imx8m
> DRAM:  alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> alloc space exhausted
> 4 GiB

My guess is that there was static code that was setting up the DRAM pll 
that isn't get executed now that there's a DM clock driver.

I'd try enabling DEBUG in the clk-uclass and clk-composite drivers.

Also look at what DRAM initialization code is not being run now. Our 
board doesn't have an DRAM specific initialization so there could be a 
bug in the DRAM setup.

> clk_register: failed to get <NULL> device (parent of ckil)
> clk_register: failed to get <NULL> device (parent of sys1_pll)
> clk_register: failed to get <NULL> device (parent of sys2_pll)
> clk_register: failed to get <NULL> device (parent of sys3_pll)

These are warnings and shouldn't affect the functioning of the driver.


> No serial driver found

Are you using the DM serial driver ?

Again this is not something that is running on our board. But I can try 
enabling it.

Thanks

Angus

> resetting ...
>
> --- >8 ---
>
> -- 
> Heiko