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From: Marco Felsch <m.felsch@pengutronix.de>
To: Mark Brown <broonie@kernel.org>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	Support Opensource <Support.Opensource@diasemi.com>,
	"linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
	"bgolaszewski@baylibre.com" <bgolaszewski@baylibre.com>,
	"andrew@aj.id.au" <andrew@aj.id.au>,
	"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
	"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"joel@jms.id.au" <joel@jms.id.au>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	Adam Thomson <Adam.Thomson.Opensource@diasemi.com>,
	"lee.jones@linaro.org" <lee.jones@linaro.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 3/6] dt-bindings: mfd: da9062: add regulator voltage selection documentation
Date: Tue, 7 Jan 2020 14:38:11 +0100
Message-ID: <20200107133811.rua5i6lflzyzlh24@pengutronix.de> (raw)
In-Reply-To: <20200107130911.GD4877@sirena.org.uk>

On 20-01-07 13:09, Mark Brown wrote:
> On Tue, Jan 07, 2020 at 09:36:54AM +0100, Marco Felsch wrote:
> > On 19-12-17 12:58, Mark Brown wrote:
> 
> > > This doesn't say anything about how the GPIO input is expected to be
> > > controlled, for voltage setting any runtime control would need to be
> > > done by the driver and it sounds like that's all that can be controlled.
> > > The way this reads I'd expect one use of this to be for fast voltage
> > > setting for example (you could even combine that with suspend sequencing
> > > using the internal sequencer if you mux back to the sequencer during
> > > suspend).
> 
> > The input signal is routed trough the da9062 gpio block to the
> > regualtors. You can't set any voltage value using a gpio instead you
> > decide which voltage setting is applied. The voltage values for
> > runtime/suspend comes from the dt-data. No it's not just a fast
> > switching option imagine the system suspend case where the cpu and soc
> > voltage can be reduced to a very low value. Older soc's like the imx6
> > signaling this state by a hard wired gpio line because the soc and
> > cpu cores don't work properly on such low voltage values. This is
> > my use case and I can't use the sequencer.
> 
> My point is that I can't tell any of this from the description.

Therefore I want to discuss the dt-binding documentation with you and
the others to get this done. Is the above description better to
understand the dt-binding?

Regards,
  Marco

  reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-29 17:25 [PATCH v3 0/6] DA9062 PMIC features Marco Felsch
2019-11-29 17:25 ` [PATCH v3 1/6] gpio: treewide rename gpio_chip_hwgpio to gpiod_to_offset Marco Felsch
2019-12-02  2:59   ` Andrew Jeffery
2019-11-29 17:25 ` [PATCH v3 2/6] gpio: make gpiod_to_offset() available for other users Marco Felsch
2019-12-02  3:00   ` Andrew Jeffery
2019-11-29 17:25 ` [PATCH v3 3/6] dt-bindings: mfd: da9062: add regulator voltage selection documentation Marco Felsch
2019-12-04 13:46   ` Mark Brown
2019-12-10  9:41     ` Marco Felsch
2019-12-11 16:14       ` Adam Thomson
2019-12-11 17:09         ` Marco Felsch
2019-12-12 15:08           ` Linus Walleij
2019-12-12 15:55             ` Marco Felsch
2019-12-12 16:10           ` Mark Brown
2019-12-12 16:21             ` Marco Felsch
2019-12-12 16:51               ` Mark Brown
2019-12-16  8:55                 ` Marco Felsch
2019-12-16 11:44                   ` Mark Brown
2019-12-17  7:35                     ` Marco Felsch
2019-12-17 12:58                       ` Mark Brown
2020-01-07  8:36                         ` Marco Felsch
2020-01-07 13:09                           ` Mark Brown
2020-01-07 13:38                             ` Marco Felsch [this message]
2020-01-14 15:43                               ` Mark Brown
2019-12-16 16:32                   ` Adam Thomson
2019-12-17  9:00                     ` Marco Felsch
2019-12-17  9:12                       ` Marco Felsch
2019-12-17  9:53                       ` Adam Thomson
2019-12-17 12:31                         ` Marco Felsch
2019-12-17 13:13                           ` Adam Thomson
2019-12-16 16:32                   ` Adam Thomson
2019-12-16 12:28               ` Linus Walleij
2019-11-29 17:25 ` [PATCH v3 4/6] regulator: da9062: add voltage selection gpio support Marco Felsch
2019-11-29 17:25 ` [PATCH v3 5/6] dt-bindings: mfd: da9062: add regulator gpio enable/disable documentation Marco Felsch
2019-12-13 22:23   ` Rob Herring
2019-12-16 16:31   ` Lee Jones
2019-11-29 17:25 ` [PATCH v3 6/6] regulator: da9062: add gpio based regulator dis-/enable support Marco Felsch
2019-12-02 11:44 ` [PATCH v3 0/6] DA9062 PMIC features Linus Walleij
2019-12-02 12:04   ` Lee Jones

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