linux-kernel - Re: [PATCH next 2/2] misc: Add Renesas Synchronization Management Unit (SMU) support

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Date:   Sun, 4 Apr 2021 12:08:43 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     min.li.xe@...esas.com
Cc:     derek.kiernan@...inx.com, dragan.cvetic@...inx.com, arnd@...db.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH next 2/2] misc: Add Renesas Synchronization Management
 Unit (SMU) support

On Sat, Apr 03, 2021 at 06:08:34PM -0400, min.li.xe@...esas.com wrote:
> From: Min Li <min.li.xe@...esas.com>
> 
> This driver is developed for the IDT ClockMatrix(TM) and 82P33xxx families
> of timing and synchronization devices.It will be used by Renesas PTP Clock
> Manager for Linux (pcm4l) software to provide support to GNSS assisted
> partial timing support (APTS) and other networking timing functions.
> 
> Current version provides kernel API's to support the following functions
> -set combomode to enable SYNCE clock support
> -read dpll's state to determine if the dpll is locked to the GNSS channel
> -read dpll's ffo (fractional frequency offset) in ppqt
> 
> Signed-off-by: Min Li <min.li.xe@...esas.com>

Any specific reason you are not using the misc_device api?  That would
clean up this driver a lot, there's no need to create a whole class just
for a single driver.

thanks,

greg k-h