linux-kernel - Re: [PATCH v2] ufs: core: print capabilities in controller's sysfs node

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Message-ID: <YuOKNX4mWCb1LUrg@kroah.com>
Date:   Fri, 29 Jul 2022 09:20:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Daniil Lunev <dlunev@...omium.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>,
        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>,
        Stanley Chu <stanley.chu@...iatek.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2] ufs: core: print capabilities in controller's sysfs
 node

On Thu, Jul 28, 2022 at 04:23:16PM -0700, Bart Van Assche wrote:
> On 7/28/22 16:05, Daniil Lunev wrote:
> > +What:		/sys/bus/platform/drivers/ufshcd/*/caps
> > +What:		/sys/bus/platform/devices/*.ufs/caps
> > +Date:		July 2022
> > +Contact:	Daniil Lunev <dlunev@...omium.org>
> > +Description:	Read-only attribute. Enabled capabilities of the UFS driver. The
> > +		enabled capabilities are determined by what is supported by the
> > +		host controller and the UFS device.
> > +		Format: 0x%08llx
> 
> This documentation is useless since the meaning of the individual bits has
> not been documented.

Yeah, that's not ok, where are these bits coming from and what userspace
tools will be using them?

thanks,

greg k-h