linux-kernel - Re: [PATCH v3 2/2] ufs: core: print UFSHCD capabilities in controller's sysfs node

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Message-ID: <YuOWV5uLVV2JYP1c@kroah.com>
Date:   Fri, 29 Jul 2022 10:12:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Daniil Lunev <dlunev@...omium.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Bart Van Assche <bvanassche@....org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>, Can Guo <cang@...eaurora.org>,
        Daejun Park <daejun7.park@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sohaib Mohamed <sohaib.amhmd@...il.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH v3 2/2] ufs: core: print UFSHCD capabilities in
 controller's sysfs node

On Fri, Jul 29, 2022 at 12:05:08PM +1000, Daniil Lunev wrote:
> Allows userspace to check if Clock Scaling, Write Booster and Inline
> Crypto Engine functionality can be enabled.
> 
> Signed-off-by: Daniil Lunev <dlunev@...omium.org>
> 
> ---
> 
> Changes in v3:
> * Expose each capability individually.
> * Update documentation to represent new scheme.
> 
> Changes in v2:
> * Add documentation entry for the new sysfs node.
> 
>  Documentation/ABI/testing/sysfs-driver-ufs | 39 ++++++++++++++++++++
>  drivers/ufs/core/ufs-sysfs.c               | 41 ++++++++++++++++++++++
>  2 files changed, 80 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
> index 6b248abb1bd71..805d76f7d7aef 100644
> --- a/Documentation/ABI/testing/sysfs-driver-ufs
> +++ b/Documentation/ABI/testing/sysfs-driver-ufs
> @@ -1591,6 +1591,45 @@ Description:	This entry shows the status of HPB.
>  
>  		The file is read only.
>  
> +What:		/sys/bus/platform/drivers/ufshcd/*/capabilities/clock_scaling

This shouldn't be linked to as a driver file, it's a device file.  So no
need for this line.

> +What:		/sys/bus/platform/devices/*.ufs/capabilities/clock_scaling

Since when are all ufs devices platform devices?  Do we not have UFS
controllers on other types of busses?

thanks,

greg k-h