Re: [PATCH 0/4] soc: toshiba: tc9564: config system controller

[Alex Elder <elder@riscstar.com>]

On 11/5/26 2:26 PM, Krzysztof Kozlowski wrote:
> On 04/11/2026 01:43, Alex Elder wrote:
>> This series is comprised of some code that was previously sent
>> separately.  It now incorporates a new system controller driver
>> that advertises clock and reset functionality, as well as regmap
>> access to its address range.  This combination is being treated
>> as a new series.  (Details of previous versions are below.)
>>
>> The Toshiba TC9564 is an SoC that attaches to a host system via PCIe.
>> It includes a PCIe switch with three downstream ports.  To one of
>> these ports an embedded PCIe endpoint is attached, and that implements
>> two PCI functions.  BAR 4 for both PCI functions provides access to
>> registers controlling blocks within the SoC.
>>
>> The system controller driver adds the clock and reset devices
>> using the mfd_add_devices() interface.  The clocks and resets
>> are implemented by drivers included in this series.
> 
> Toshiba TC9564 bindings and DTS should be posted completely. We spent
> great amount of time on discussing already and I pointed more than once
> that big picture is missing.

https://github.com/riscstar/linux/blob/tc9564-dts/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts

Node pcie@3,0 is the third switch port (within the TC9564), which
has an embedded PCIe endpoint with two functions.  (You can ignore
pci-ep-bus@0 for now.)

> You are not describing here parts of a SoC.
> 
> You are describing one, single device how the host sees it and DT
> maintainers (and writing bindings) ask for complete picture in such cases.

I'm glad to provide whatever information you need.  There is more
than one way to provide the "complete picture" however, and I don't
want to send something that isn't helpful.

If you want something different from just the DTS file linked above,
please say so and I'll put something together.

For example:
- Would you prefer something that includes only the PCI hierarchy
   starting at the TC9564 embedded PCI endpoint and its two functions?
- Is a DTS file sufficient, or do you want the TC9564 bindings instead?
- Do you want any other high-level description of the chip?
- Do you want more information about the system that contains the
   chip?

Thank you.

					-Alex


> Best regards,
> Krzysztof