linux-kernel - Re: [PATCH v7 3/6] Documentation: Add ABI doc for attributes of LJCA device

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Message-ID: <ZDPoku+k+S65cmeQ@ye-NUC7i7DNHE>
Date:   Mon, 10 Apr 2023 18:44:34 +0800
From:   "Ye, Xiang" <xiang.ye@...el.com>
To:     Oliver Neukum <oneukum@...e.com>
CC:     Ye Xiang <xiang.ye@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Matthias Kaehlcke" <mka@...omium.org>, Lee Jones <lee@...nel.org>,
        Wolfram Sang <wsa@...nel.org>,
        Tyrone Ting <kfting@...oton.com>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Bartosz Golaszewski" <brgl@...ev.pl>, <linux-usb@...r.kernel.org>,
        <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <srinivas.pandruvada@...el.com>, <heikki.krogerus@...ux.intel.com>,
        <andriy.shevchenko@...ux.intel.com>,
        <sakari.ailus@...ux.intel.com>, <zhifeng.wang@...el.com>,
        <wentong.wu@...el.com>, <lixu.zhang@...el.com>
Subject: Re: [PATCH v7 3/6] Documentation: Add ABI doc for attributes of LJCA
 device

Hi Oliver

Thanks for the review.
On Tue, Apr 04, 2023 at 10:53:48AM +0200, Oliver Neukum wrote:
> 
> 
> On 25.03.23 16:47, Ye Xiang wrote:
> > Add sysfs attributes Documentation entries for LJCA device
> 
> Hi,
> 
> do we really want each driver to have its own attribute for that?
> It seems to me that that should be unified.
Three ABI entries are added in this patch: ljca_version, ljca_trace_level,
and ljca_enable_dfu. The first two items are specified for LJCA device and
I think they can be kept in sysfs-bus-usb-devices-ljca.

But for ljca_enable_dfu, I didn't see a unified DFU entry in sys-bus-usb.
I am not sure whether other USB devices have similar DFU mode or not.

Any suggestions?

Thanks
Ye Xiang
> 
> > +
> > +What:		/sys/bus/usb/.../ljca_enable_dfu
> > +Date:		July 2023
> > +KernelVersion:	6.4
> > +Contact:	Ye Xiang<xiang.ye@...el.com>
> > +Description:
> > +		Writing 1 to this file to force the LJCA device into DFU
> > +		mode so the firmware can be updated. After firmware
> > +		updating has been done, the device will back to normal
> > +		working mode.