linux-kernel - Re: [RFC v2 2/4] fpga: Add new property to support user-key encrypted bitstream loading

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Date:   Wed, 9 Jun 2021 11:56:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Nava kishore Manne <nava.manne@...inx.com>
Cc:     robh+dt@...nel.org, michal.simek@...inx.com, mdf@...nel.org,
        trix@...hat.com, arnd@...db.de, rajan.vaja@...inx.com,
        amit.sunil.dhamne@...inx.com, tejas.patel@...inx.com,
        zou_wei@...wei.com, lakshmi.sai.krishna.potthuri@...inx.com,
        ravi.patel@...inx.com, iwamatsu@...auri.org,
        wendy.liang@...inx.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org, git@...inx.com,
        chinnikishore369@...il.com
Subject: Re: [RFC v2 2/4] fpga: Add new property to support user-key
 encrypted bitstream loading

On Wed, Jun 09, 2021 at 11:22:30AM +0530, Nava kishore Manne wrote:
> This patch Adds ‘encrypted-key-name’ property to
> support user-key encrypted bitstream loading
> use case.
> 
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
> Changes for v2:
>                 -Both DT properties ie; encrypted-key-name and encrypted-user-key-fpga-config
>                  are targeted to use for the same use cases but ideally encrypted-key-name
>                  is enough to serve the purpose so updated the file to remove the unwanted
>                  encrypted-user-key-fpga-config property as suggested by Rob.
> 
>  Documentation/devicetree/bindings/fpga/fpga-region.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/fpga/fpga-region.txt b/Documentation/devicetree/bindings/fpga/fpga-region.txt
> index d787d57491a1..0de4a1c54650 100644
> --- a/Documentation/devicetree/bindings/fpga/fpga-region.txt
> +++ b/Documentation/devicetree/bindings/fpga/fpga-region.txt
> @@ -177,6 +177,9 @@ Optional properties:
>  	it indicates that the FPGA has already been programmed with this image.
>  	If this property is in an overlay targeting a FPGA region, it is a
>  	request to program the FPGA with that image.
> +- encrypted-key-name : should contain the name of an encrypted key file located
> +	on the firmware search path. It will be used to decrypt the FPGA image
> +	file with user-key.

What is the format this "user-key" is in?  Where is the documentation
for how to use this type of thing?

thanks,

greg k-h