[PATCH RFC 0/5] BCMBCA PMB reset controller

[Florian Fainelli]

On 10/14/26 02:48, Linus Walleij wrote:
> This is another of these big upfront design binding and driver
> hoards that is the consequence of adding new SoC support. My stake
> is to be able to boot and test a full featured Cortex-A5 system and
> the BCM6846 XG6846B is one such system on my desk.
> 
> It's been cooking for a while in various prototype forms.
> 
> IMPLEMENTATION:
> 
> Add a shared Processor Monitor Bus (PMB) driver and a child reset
> provider for Broadcom BCMBCA blocks. Support BCM6846 XRDP and its Runner
> cores, PCIe0/1 and PVTMON. The PMB bus driver uses the third generation
> Platform Management Controller (PMC3) keyhole interface. It owns the
> register bank and serializes complete sequences for child services.
> 
> The fixed SoC transport is built-in and has no sysfs bind/unbind
> controls, allowing delayed recovery to retain hardware ownership
> until a busy transaction completes. The reset child can be modular.
> 
> The series contains three bindings, the PMB bus driver, and the PMB reset
> driver. Describe PMC 3.1 as a simple-mfd with two system-controller
> children and a bus child, each owning its register window.
> 
> The bus child exposes the PMB transport and contains the reset provider.
> The parent uses Broadcom's "brcm,bca-pmc-3-1" compatible. The PMB and
> reset drivers support only the BCM6846-specific compatibles for now.
> Other BCMBCA SoCs have different reset groups or PMB interfaces.
> 
> Use one reset specifier cell and define BCM6846_RESET_XRDP as ID 0 for
> XRDP and its three Runner cores. The vendor sources describe individual
> PMB device addresses and reset masks, but no ID for this combined group.
> SoC tables map IDs to blocks, register values, timing and sequence
> callbacks. PCIe pulses preserve lane-selection straps. PVTMON uses its
> analog-acquisition reset. Consumers must quiesce every affected user;
> these resets do not replace clock, power-domain, PHY or UBUS setup.
> Power-cycle operations for USB2, WAN, PERIPH, MEMC, BIU and BIU PLL are
> left to power-domain and platform power-management support.
> 
> This series is based on v7.3-rc1 and is a prerequisite for the
> forthcoming Genexis XG6846B Ethernet support series, which works.

Excellent, looking forward to seeing that!

> 
> The BCM6846 XRDP reset sequence enabled full-MTU traffic on all four LAN
> ports and copper WAN and has been tested on that series.

Very nice!

> 
> MISSING:
> 
> I did not add MAINTAINERS entries because I don't know how the Broadcom
> maintainers feel about it. Tell me.

I have no objection with being listed, I am more familiar with the PMC 
present on the 63138/63148 than this one but having access to 
documentation and people helps.
-- 
Florian