linux-kernel - Re: [PATCH v2 2/3] scsi: ufs: Modulize ufs-bsg

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Date:   Mon, 16 Dec 2019 12:36:10 +0800
From:   cang@...eaurora.org
To:     Bart Van Assche <bvanassche@....org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Evan Green <evgreen@...omium.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Stephen Boyd <swboyd@...omium.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Bean Huo <beanhuo@...ron.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] scsi: ufs: Modulize ufs-bsg

On 2019-12-16 05:49, Bart Van Assche wrote:
> On 2019-12-11 22:37, Bjorn Andersson wrote:
>> It's the asymmetry that I don't like.
>> 
>> Perhaps if you instead make ufshcd platform_device_register_data() the
>> bsg device you would solve the probe ordering, the remove will be
>> symmetric and module autoloading will work as well (although then you
>> need a MODULE_ALIAS of platform:device-name).
> 
> Hi Bjorn,
> 
> From Documentation/driver-api/driver-model/platform.rst:
> "Platform devices are devices that typically appear as autonomous
> entities in the system. This includes legacy port-based devices and
> host bridges to peripheral buses, and most controllers integrated
> into system-on-chip platforms.  What they usually have in common
> is direct addressing from a CPU bus.  Rarely, a platform_device will
> be connected through a segment of some other kind of bus; but its
> registers will still be directly addressable."
> 
> Do you agree that the above description is not a good match for the
> ufs-bsg kernel module?
> 
> Thanks,
> 
> Bart.

Hi Bart,

I missed this one.
How about making it a plain device and add it from ufs driver?

Thanks,

Can Guo.