linux-kernel - Re: [alsa-devel] [PATCH 15/27] ALSA: hda - Use timecounter

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Date:   Thu, 28 Dec 2017 08:49:44 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Sagar Arun Kamble <sagar.a.kamble@...el.com>
Cc:     Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, Vinod Koul <vinod.koul@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [alsa-devel] [PATCH 15/27] ALSA: hda - Use
 timecounter_initialize interface

On Tue, Dec 26, 2017 at 01:07:35PM +0530, Sagar Arun Kamble wrote:
> > Or can we provide simpler versions for covering some defaults?  At
> > least reducing the number of arguments would make things easier.
> Thought about specifying 1. cyclecounter read func 2. frequency 3. width of
> counter as parameters here
> which can get rid of mult, shift params. But this is not easy as most of the
> drivers do not specify
> cyclecounter frequency and instead hard-code the mult/shift factors.

You are talking about using clocks_calc_mult_shift() here, right? (See
the usage example in drivers/net/ethernet/ti/cpts.c).

This is a good idea, and it is worth getting the driver authors' input
to figure out the correct parameters.

I bet we can use that almost everywhere.  If there are any drivers
that cannot be converted, then we can leave some sort of low level
legacy initialization method.

Thanks,
Richard