RE: [PATCH] dmaengine: rcar-dmac: Update copyright information

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Hi Geert-san,

> From: Geert Uytterhoeven, Sent: Wednesday, April 24, 2019 9:22 PM
> 
> Hi Niklas, Shimoda-san,
> 
> On Thu, Apr 11, 2019 at 5:18 PM Niklas Söderlund
> <niklas.soderlund@xxxxxxxxxxxx> wrote:
> > On 2019-04-11 10:49:37 +0200, Simon Horman wrote:
> > > On Wed, Apr 10, 2019 at 08:26:57PM +0200, Niklas Söderlund wrote:
> > > Not strictly related, but is it appropriate to:
> > >
> > > 1. Move this driver and drivers/dma/sh/usb-dmac.c to drivers/dma/renesas/
> 
> That may make sense...
> 
> > > 2. Remove drivers/dma/sh/sudmac.c which appears unused
> >
> > I let someone with a better grasp of history answer this one. From my
> > side removing drivers which are unused seems like a good idea :-)
> 
> There seem to be some (half-baked?) interaction between sudmac.c and
> drivers/usb/gadget/udc/r8a66597-udc.c and drivers/usb/renesas_usbhs/fifo.c.
> These don't seem to be used at all on Renesas ARM platforms, but
> CONFIG_USB_R8A66597_HCD is enabled in shmobile_defconfig and
> multi_v7_defconfig?
> 
> Shimoda-san: can you please enlighten us?
> Thanks!

Sure.

- SH4A / sh7757 has SUDMAC. (any other Renesas ARM platforms don't have it).
 # sh7757 is not public product though...
- At first, I added this SUDMAC support into r8a66597-udc.
- But, our direction is changed by some reason. So, we use renesas_usbhs driver anyway.
- The renesas_usbhs supports dmaengine, so I added dma/sh/sudmac driver.
- However, for some reasons (maybe I'm busy for other projects?),
  I didn't add using the sudmac support into arch/sh/kernel/cpu/sh4a/setup-sh7757.c.
- So, no one uses both r8a66597-udc and sudmac now.

>From 2013 (added the sudmac driver) to now, since no one integrated the sudmac for sh7757,
I think we can remove the driver.

Best regards,
Yoshihiro Shimoda





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