[PATCH v2 2/2] clk: imx8mq: Add a clock driver for the imx8mq

Angus Ainslie angus at akkea.ca
Fri Mar 11 19:41:34 CET 2022

On 2022-03-11 10:05, Marek Vasut wrote:
> On 3/11/22 18:02, Angus Ainslie wrote:
>> On 2022-03-11 08:57, Marek Vasut wrote:
>>> On 3/11/22 17:35, Angus Ainslie wrote:
>>>> 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
>>>> The PLL rate tables are from the kernel
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43cdaa1567ad3931fbde438853947d45238cc040
>>> That patch is three years old.
>>> That patch is for MX8M Mini clock, not for MX8M(Q).
>>> You can use the abbreviated commit ID instead:
>>> 43cdaa1567ad3 ("clk: imx8mm: Move 1443X/1416X PLL clock structure to 
>>> common place")
>>> But that seems to be the wrong commit.
>> That's the commit where the imx8m PLL frequency table is moved to a 
>> common file for use by all of the imx8m variants. The imx8mq linux 
>> driver does not even use the frequency tables so there is not a 
>> specific commit for it.
> Isn't large part of this driver coming from these tables ?
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/clk/imx/clk-imx8mq.c

When I said tables I was referring to the PLL frequency tables.

The driver is modelled after the u-boot imx8mm u-boot driver with 
register and mux updates from the imx8mq reference manual. Very little 
comes from the imx8mq kernel driver. Mainly I just verified mux naming 
and register offsets against that driver.

That reminds me that I need to send a kernel patch for the monitor 

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