Re: [PATCH] docs: mtd: Update spi nor reference driver

[John Garry]

On 19/08/2019 05:39, Vignesh Raghavendra wrote:
> Hi,
>
> On 16/08/19 3:50 PM, John Garry wrote:
> > On 06/08/2019 17:40, Schrempf Frieder wrote:
> [...]
> > Hi,
> >
> > Could someone kindly advise on the following:

Hi Vignesh,

> > I am looking at ACPI support only for an mtd spi nor driver we're
> > targeting for mainline support.
>
> If its a new driver, please add it under drivers/spi implementing SPI
> MEM framework.
> There are few drivers under drivers/spi that can be used as example.
> (Search for "spi_mem_ops"

Ok, fine. I note that in doing this I would still be using the spi nor 
framework indirectly through the m25p80 driver.

> > So for the host, I could use a proprietary HID in the DSDT for matching
> > in the kernel driver.
> >
> > About the child spi flash devices, is the recommendation to just use
> > PRP0001 HID and "jedec,spi-nor" compatible?
>
> I am not quite familiar with ACPI systems, but child flash device should
> use "jedec,spi-nor" as compatible.

Right, so to use SPI MEM framework, it looks like I will have to use 
PRP0001 and "jedec,spi-nor" as compatible.

My reluctance in using PRP0001 and compatible "jedec,spi-nor" is how 
other OS can understand this.

All the best,
John

> Regards
> Vignesh
>
> > thanks,
> > John