Hi Wolfram,
On Mon, Sep 24, 2018 at 2:26 PM Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
> > It seems RZ/G1C has two slighty different types of SD card interfaces:
> > 1. SDHI0 and SDHI2 use SYS-DMAC,
> > 2. SDHI1 can also be used as an MMC interface, and has an internal DMAC.
> >
> > Do we need to distinguish between them using the compatible value, or
> > are there other ways?
>
> Yes, that seems to need an update to our current implementation which is
> per-SoC only. One idea from my side would be to whitelist SYS-DMAC for
> this compatible and then check if dma-properties are present, otherwise
> fall back to internal DMAC?
I'm afraid that won't work, as the "dmas" properties are optional. So you
cannot distinguish between optional properties missing and internal DMA
present.
A dirty hack would be checking the device name for xxxxxxxx.sdhi, like how
whitelisting is implemented in the IPMMU driver.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
