[RFC,1/6] dma: Add Synopsys eDMA IP core driver

[Bjorn Helgaas <helgaas@kernel.org>]

On Wed, Dec 12, 2018 at 12:13:21PM +0100, Gustavo Pimentel wrote:
> Add Synopsys eDMA IP core driver to kernel.
> 
> This core driver, initializes and configures the eDMA IP using vma-helpers
> functions and dma-engine subsystem.
> 
> Also creates an abstration layer through callbacks allowing different
> registers mappings in the future, organized in to versions.
> 
> This driver can be compile as built-in or external module in kernel.
> 
> To enable this driver just select DW_EDMA option in kernel configuration,
> however it requires and selects automatically DMA_ENGINE and
> DMA_VIRTUAL_CHANNELS option too.
> 
> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: Vinod Koul <vkoul@kernel.org>
> Cc: Eugeniy Paltsev <paltsev@synopsys.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Joao Pinto <jpinto@synopsys.com>

> --- /dev/null
> +++ b/drivers/dma/dw-edma/dw-edma-core.c
> @@ -0,0 +1,925 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
> +// Synopsys DesignWare eDMA core driver

The SPDX line in .c files needs the // comment for some obscure reason
I can't remember, but based on the other drivers/dma/*.c files, it
looks like the convention is the usual /* .. */ comments for the rest.

I think the SPDX line is /* */ in .h files though.  The rules are
under Documentation/ somewhere.