linux-kernel - RE: [EXT] Re: Issue: regmap: use debugfs even when no device

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Message-ID: <VI1PR0402MB36007B2A40344C69BACA13B7FF180@VI1PR0402MB3600.eurprd04.prod.outlook.com>
Date:   Thu, 30 May 2019 04:56:22 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Mark Brown <broonie@...nel.org>
CC:     "david@...hnology.com" <david@...hnology.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        Robby Cai <robby.cai@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: Issue: regmap: use debugfs even when no device

From: Mark Brown <broonie@...nel.org> Sent: Wednesday, May 29, 2019 7:16 PM
> To: Andy Duan <fugang.duan@....com>
> Cc: david@...hnology.com; rafael@...nel.org; Robby Cai
> <robby.cai@....com>; gregkh@...uxfoundation.org; linux-kernel
> <linux-kernel@...r.kernel.org>
> Subject: Re: [EXT] Re: Issue: regmap: use debugfs even when no device
> 
> On Wed, May 29, 2019 at 01:33:46AM +0000, Andy Duan wrote:
> 
> > Correct, regmap without device also has issue when power if off,
> > because regmap doesn't implement runtime pm for the device, but maybe
> > device driver implement the runtime pm for the device.
> 
> > So regmap how to manage the clock and power when access registers by
> debugfs ?
> 
> Like I say the basic recommendation is to use a cache.

Got it, thanks.