Re: [PATCH v2 2/3] spi: Add HiSilicon v3xx SPI NOR flash controller driver

[John Garry]

On 13/01/2020 11:42, Mark Brown wrote:
> On Mon, Jan 13, 2020 at 10:09:27AM +0000, John Garry wrote:
> > On 10/01/2020 19:31, Andy Shevchenko wrote:
>
> > > PRP method is only for vendors to *test* the hardware in ACPI environment.
> > > The proper method is to allocate correct ACPI ID.
>
> > Yes, that would seem the proper thing to do. So the SPI NOR driver is based
> > on micron m25p80 and compatible string is "jedec,spi-nor", so I don't know
> > who should or would do this registration.

Hi Mark,

> The idiomatic approach appears to be for individual board vendors
> to allocate IDs, you do end up with multiple IDs from multiple
> vendors for the same thing.

So we see sort of approach a lot when vendors integrate 3rd party IP 
into a SoC and then assign some vendor specific ID for that.

But I am not sure how appropriate that same approach would be for some 
3rd party memory part which we're simply wiring up on our board. Maybe 
it is.

> > BTW, Do any of these sensors you mention have any ACPI standardization?
>
> In general there's not really much standardizaiton for devices,
> the bindings that do exist aren't really centrally documented and
> the Windows standard is just to have the basic device
> registration in the firmware and do all properties based on
> quirking based on DMI information.

OK, so there is always DMI. I hoped to avoid this sort of thing in the 
linux driver :)

Cheers,
John