Re: Fwd: [alsa-devel] [PATCH 1/1] SPI : spi-pxa2xx : fix spi init of WM510205 codec via ACPI (resend)

Charles Keepax
2015-06-25T15:44:07Z

On Thu, Jun 25, 2015 at 03:58:53PM +0100, Mark Brown wrote:
> On Thu, Jun 25, 2015 at 02:18:23PM +0200, Christian Hartmann wrote:
>
> > Name (_HID, "WM510205") // _HID: Hardware ID
> > Name (_CID, "WM510205") // _CID: Compatible ID
> > Name (_DDN, "Wolfson Microelectronics Audio WM5102")
>
> Separately to the chip select discussion one thing to highlight here is
> that for some reason the BIOS is listing the device as "WM510205" rather
> than "WM5102" - do those extra numbers mean anything and does this mean
> that WM50120[1-4] and possibly higher numbers are also valid?

>From my brief discussions with the Windows guys here on this
basically those last two digits are being used to inform the
Windows driver of use-case setup. So here it will set things up
for whatever the Window's driver considers to be setup "5".

I think from the Linux side we can safely ignore those last two
digits. I expect that all systems of the same make and model
would report the same last two digits but that it might change
between models if the Windows driver is expected to something
differently for that model.

Thanks,
Charles