linux-kernel - Re: [PATCH misc v2 2/2] misc: Add Renesas Synchronization Management Unit (SMU) support

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Date:   Thu, 16 Sep 2021 07:25:54 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     min.li.xe@...esas.com
Cc:     arnd@...db.de, derek.kiernan@...inx.com, dragan.cvetic@...inx.com,
        linux-kernel@...r.kernel.org, lee.jones@...aro.or
Subject: Re: [PATCH misc v2 2/2] misc: Add Renesas Synchronization Management
 Unit (SMU) support

On Wed, Sep 15, 2021 at 02:47:09PM -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.

Where is that software?

Why is this new api not a standard one?

What is the standard here?

What do other devices do and why is this a new api?

> 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

Why do all of these have to be in the kernel at all?

thanks,

greg k-h