Re: [PATCH 0/3] Remove shdma DT support

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Adrian,

On Wed, Jun 16, 2021 at 12:42 PM John Paul Adrian Glaubitz
<glaubitz@physik.fu-berlin.de> wrote:
> On 6/11/21 12:18 PM, Geert Uytterhoeven wrote:
> > Hence this series removes the Renesas SHDMA Device Tree bindings, the
> > SHDMA DMA multiplexer driver, and the corresponding description in the
> > R-Mobile APE6 DTS.
> Do these changes make life harder in case we want to convert SH to device
> tree as already prepared by Yoshinori Sato? [1]

Probably not. The only modern DT-aware DMAC drivers for Renesas
hardware are drivers/dma/sh/{rcar,usb}-dmac.c.  Soon there will be
drivers/dma/sh/rz-dmac.c, for RZ/G2L (and RZ/A1 and RZ/A2 later).
Given the R-Car DMAC is very similar to the SH/R-Mobile DMAC, the
latter may be made to work with rcar-dmac.c, if anyone is willing
to spend cycles on that.  Likewise, the RZ/A DMAC probably has its
roots in older SH SoCs, so that may be helpful for you, too.

Chris (CCed) may know better...

> > [1] https://lore.kernel.org/patchwork/cover/693910/

None of these handle DMA?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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