Re: [RFC v5 net-next 01/13] mfd: ocelot: add support for external mfd control over SPI for the VSC7512

On 11/01/2022 10:28:15-0800, Colin Foster wrote:

At the same time, mscc-miim can be probed independently, at which point it
would create a smaller regmap at 0x7107009c
(Documentation/devicetree/bindings/mscc-miim.txt)

So the mscc-miim driver supports multiple use-cases. I expect the same
type of "offset" idea can be reasonably added to the following drivers,
all of which already exist but need to support the same type of
use-case:

mscc,ocelot-pinctrl, mscc,ocelot-sgpio, mscc,ocelot-miim, and
mscc,vsc7514-serdes. As I'm bringing up different parts of the hardware,
there might be more components that become necessary.

Indeed, I guess at some point you'll need the irqchip driver too. Until
now, what I did was handling the irq controller inside the mfd driver as
reusing the irqchip driver is not trivial. Ths create a bit of code
duplication but it is not that bad.

With the exception of vsc7514-serdes, those all exist outside of MFD.
The vsc7512-serdes driver currently relies on syscon / MFD, which adds a
different complexity. One that I think probably merits a separate probe
function.

quoted

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