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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Rob Herring <robh+dt@kernel.org>, Vinod Koul <vkoul@kernel.org>,
	Magnus Damm <magnus.damm@gmail.com>,
	Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>,
	Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	dmaengine <dmaengine@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Linux-sh list <linux-sh@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Chris Brandt <Chris.Brandt@renesas.com>
Subject: Re: [PATCH 0/3] Remove shdma DT support
Date: Wed, 16 Jun 2021 13:18:17 +0200	[thread overview]
Message-ID: <CAMuHMdU_B4pRyaz4nhp3k0dtXy3A8tRYbdCpmYYaSpzeZCeWOw@mail.gmail.com> (raw)
In-Reply-To: <0c6bdd6a-826c-6831-1477-3a1e782cced3@physik.fu-berlin.de>

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

WARNING: multiple messages have this Message-ID
From: Geert Uytterhoeven <geert@linux-m68k.org>
To: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Rob Herring <robh+dt@kernel.org>, Vinod Koul <vkoul@kernel.org>,
	 Magnus Damm <magnus.damm@gmail.com>,
	 Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>,
	 Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
	 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	dmaengine <dmaengine@vger.kernel.org>,
	 Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	 Linux-sh list <linux-sh@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 Chris Brandt <Chris.Brandt@renesas.com>
Subject: Re: [PATCH 0/3] Remove shdma DT support
Date: Wed, 16 Jun 2021 13:18:17 +0200	[thread overview]
Message-ID: <CAMuHMdU_B4pRyaz4nhp3k0dtXy3A8tRYbdCpmYYaSpzeZCeWOw@mail.gmail.com> (raw)
In-Reply-To: <0c6bdd6a-826c-6831-1477-3a1e782cced3@physik.fu-berlin.de>

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

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-06-16 11:18 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-11 10:18 Geert Uytterhoeven
2021-06-11 10:18 ` Geert Uytterhoeven
2021-06-16 10:38 ` Vinod Koul
2021-06-16 10:38   ` Vinod Koul
2021-06-16 10:42 ` John Paul Adrian Glaubitz
2021-06-16 10:42   ` John Paul Adrian Glaubitz
2021-06-16 11:18   ` Geert Uytterhoeven [this message]
2021-06-16 11:18     ` Geert Uytterhoeven

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