linux-kernel - Re: [PATCH v5 2/8] char: rpmb: add sysfs-class ABI documentation

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Date:   Wed, 31 Aug 2016 12:53:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Vinayak Holikatti <vinholikatti@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Michael Ryleev <gmar@...gle.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Christoph Hellwig <hch@....de>,
        Yaniv Gardi <ygardi@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v5 2/8] char: rpmb: add sysfs-class ABI documentation

On Mon, Jul 18, 2016 at 11:27:47PM +0300, Tomas Winkler wrote:
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> ---
> V2: resend
> V3: add more verbose description
> V4: resend
> V5: adjust date and kernel version
> 
>  Documentation/ABI/testing/sysfs-class-rpmb | 20 ++++++++++++++++++++
>  MAINTAINERS                                |  1 +
>  2 files changed, 21 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-class-rpmb
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-rpmb b/Documentation/ABI/testing/sysfs-class-rpmb
> new file mode 100644
> index 000000000000..3ffcd2d1f683
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-class-rpmb
> @@ -0,0 +1,20 @@
> +What:		/sys/class/rpmb/
> +Date:		Aug 2016
> +KernelVersion:  4.8
> +Contact:	Tomas Winkler <tomas.winkler@...el.com>
> +Description:
> +		The rpmb/ class sub-directory belongs to RPMB device class.
> +
> +		Few storage technologies such is EMMC, UFS, and NVMe support
> +		Replay Protected Memory Block (RPMB) hardware partition with
> +		common protocol and frame layout.
> +		Such a partition provides authenticated and replay protected access,
> +		hence suitable as a secure storage.
> +
> +What:		/sys/class/rpmb/rpmbN/
> +Date:		Aug 2016
> +KernelVersion:	4.8
> +Contact:	Tomas Winkler <tomas.winkler@...el.com>
> +Description:
> +		The /sys/class/rpmb/rpmbN directory is created for
> +		each RPMB registered device

So you have no sysfs files?  If not, why have a sysfs class at all?

thanks,

greg k-h