From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Vinod Koul <vkoul@kernel.org>,
dmaengine <dmaengine@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Linux-sh list <linux-sh@vger.kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH 0/3] dmaengine: Stear users towards dma_request_slave_chan()
Date: Tue, 4 Feb 2020 09:01:55 +0100 [thread overview]
Message-ID: <CAMuHMdUYcSPoK8NOSdMzU_Jtg84aPMNKeGnacnF7=aidV4eqvw@mail.gmail.com> (raw)
In-Reply-To: <b09ad222-f5b8-af5a-6c2b-2dd6b30f1c73@ti.com>
Hi Peter,
On Tue, Feb 4, 2020 at 7:52 AM Peter Ujfalusi <peter.ujfalusi@ti.com> wrote:
> On 03/02/2020 22.34, Geert Uytterhoeven wrote:
> > On Mon, Feb 3, 2020 at 9:21 PM John Paul Adrian Glaubitz
> > <glaubitz@physik.fu-berlin.de> wrote:
> >> On 2/3/20 2:32 PM, Geert Uytterhoeven wrote:
> >>> Both rspi and sh-msiof have users on legacy SH (i.e. without DT):
> >>
> >> FWIW, there is a patch set by Yoshinori Sato to add device tree support
> >> for classical SuperH hardware. It was never merged, unfortunately :(.
> >
> > True.
> >
> >>> Anyone who cares for DMA on SuperH?
> >>
> >> What is DMA used for on SuperH? Wouldn't dropping it cut support for
> >> essential hardware features?
> >
> > It may make a few things slower.
>
> I would not drop DMA support but I would suggest to add dma_slave_map
> for non DT boot so the _compat() can be dropped.
Which is similar in spirit to gpiod_lookup and clk_register_clkdev(),
right?
> Imho on lower spec SoC (and I believe SuperH is) the DMA makes big
> difference offloading data movement from the CPU.
Assumed it is actually used...
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
next prev parent reply other threads:[~2020-02-04 8:02 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-03 10:18 [PATCH 0/3] dmaengine: Stear users towards dma_request_slave_chan() Peter Ujfalusi
2020-02-03 10:18 ` [PATCH 1/3] dmaengine: Remove unused define for dma_request_slave_channel_reason() Peter Ujfalusi
2020-02-03 13:35 ` Geert Uytterhoeven
2020-02-03 10:18 ` [PATCH 2/3] dmaengine: Mark dma_request_slave_channel() deprecated Peter Ujfalusi
2020-02-03 10:18 ` [PATCH 3/3] dmaengine: Encourage dma_request_slave_channel_compat() users to migrate Peter Ujfalusi
2020-02-03 10:35 ` Andy Shevchenko
2020-02-03 10:37 ` [PATCH 0/3] dmaengine: Stear users towards dma_request_slave_chan() Andy Shevchenko
2020-02-03 10:59 ` Peter Ujfalusi
2020-02-03 11:16 ` Andy Shevchenko
2020-02-03 12:09 ` Peter Ujfalusi
2020-02-03 12:48 ` Andy Shevchenko
2020-02-03 13:32 ` Geert Uytterhoeven
2020-02-03 20:21 ` John Paul Adrian Glaubitz
2020-02-03 20:34 ` Geert Uytterhoeven
2020-02-03 21:26 ` John Paul Adrian Glaubitz
2020-02-04 8:13 ` Geert Uytterhoeven
2020-02-04 6:52 ` Peter Ujfalusi
2020-02-04 8:01 ` Geert Uytterhoeven [this message]
2020-02-04 8:15 ` Peter Ujfalusi
2020-02-04 8:21 ` Peter Ujfalusi
2020-02-04 9:16 ` Rob Landley
2020-02-04 9:27 ` Geert Uytterhoeven
2020-02-04 10:18 ` Rob Landley
2020-02-04 6:21 ` Vinod Koul
2020-02-04 11:21 ` Andy Shevchenko
2020-02-05 4:43 ` Vinod Koul
2020-02-05 8:10 ` Peter Ujfalusi
2020-02-05 11:31 ` Vinod Koul
2020-02-05 11:56 ` Peter Ujfalusi
2020-02-05 11:59 ` Vinod Koul
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