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From: Mark Brown <broonie@kernel.org>
To: Marco Felsch <m.felsch@pengutronix.de>
Cc: Doug Anderson <dianders@chromium.org>,
	Chunyan Zhang <zhang.chunyan@linaro.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	ckeepax@opensource.cirrus.com,
	LKML <linux-kernel@vger.kernel.org>,
	Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH 1/3] regulator: core: fix boot-on regulators use_count usage
Date: Tue, 8 Oct 2019 16:42:13 +0100	[thread overview]
Message-ID: <20191008154213.GL4382@sirena.co.uk> (raw)
In-Reply-To: <20191008145605.5yf4hura7qu4fuyg@pengutronix.de>

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On Tue, Oct 08, 2019 at 04:56:05PM +0200, Marco Felsch wrote:
> On 19-10-08 13:51, Mark Brown wrote:

> > No, we shouldn't do anything when the regulator probes - we'll only
> > disable unused regulators when we get to the end of boot (currently we
> > delay this by 30s to give userspace a chance to run, that's a hack but
> > we're fresh out of better ideas).  During boot the regulator state will
> > only be changed if some consumer appears and changes the state.

> Okay, so this won't disable the regualtor?

> 8<----------------------------------------------------------------
> static int reg_fixed_voltage_probe(struct platform_device *pdev)
> {
> 	...
> 
> 	if (config->enabled_at_boot)
> 		gflags = GPIOD_OUT_HIGH;
> 	else
> 		gflags = GPIOD_OUT_LOW;
> 
> 	...
> }
> 8<----------------------------------------------------------------

If this is a GPIO regulator then the Linux APIs mean you can't read the
status back so it's one of the regulators for which this property was
invented.  This is a real limitation of the Linux APIs, with most
hardware you can actually read the status back so we shouldn't need
this.

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  reply	other threads:[~2019-10-08 15:42 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17 15:40 [PATCH 0/3] Regulator core fixes Marco Felsch
2019-09-17 15:40 ` [PATCH 1/3] regulator: core: fix boot-on regulators use_count usage Marco Felsch
2019-09-23 18:02   ` Doug Anderson
2019-09-23 18:14     ` Mark Brown
2019-09-23 18:36       ` Doug Anderson
2019-09-23 18:49         ` Mark Brown
2019-09-23 22:40           ` Doug Anderson
2019-09-24 18:27             ` Mark Brown
2019-09-26 19:44               ` Doug Anderson
2019-09-27  8:47                 ` Marco Felsch
2019-10-01 19:57                   ` Doug Anderson
2019-10-04  6:34                     ` Matti Vaittinen
2019-10-04 11:32                       ` Mark Brown
2019-10-04 12:03                         ` Vaittinen, Matti
2019-10-04 15:01                           ` Mark Brown
2019-10-07  9:34                     ` Marco Felsch
2019-10-07 18:29                       ` Mark Brown
2019-10-08  6:03                         ` Marco Felsch
2019-10-08 12:51                           ` Mark Brown
2019-10-08 14:56                             ` Marco Felsch
2019-10-08 15:42                               ` Mark Brown [this message]
2019-10-08 16:16                                 ` Marco Felsch
2019-10-08 16:23                                   ` Mark Brown
2019-10-08 20:16                                     ` Marco Felsch
2019-10-09  9:54                                       ` Mark Brown
2019-09-17 15:40 ` [PATCH 2/3] regulator: of: fix suspend-min/max-voltage parsing Marco Felsch
2019-09-17 16:02   ` Applied "regulator: of: fix suspend-min/max-voltage parsing" to the regulator tree Mark Brown
2019-09-17 15:40 ` [PATCH 3/3] regulator: core: make regulator_register() EPROBE_DEFER aware Marco Felsch
2019-09-17 16:02   ` Applied "regulator: core: make regulator_register() EPROBE_DEFER aware" to the regulator tree Mark Brown
2019-09-18  0:57   ` [PATCH 3/3] regulator: core: make regulator_register() EPROBE_DEFER aware Dmitry Torokhov
2019-09-18  8:18     ` Marco Felsch
2019-09-18 15:53       ` Dmitry Torokhov
2019-09-18 16:06         ` Marco Felsch
2019-09-18 16:08         ` Mark Brown

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