linux-kernel - Re: Proposal: I2C device power (Was: hwmon: (lm90) Add power control)

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Message-ID: <1376045411.585130456@f141.i.mail.ru>
Date:	Fri, 09 Aug 2013 14:50:11 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Mark Brown <broonie@...nel.org>
Cc:	Wei Ni <wni@...dia.com>, swarren@...dotorg.org,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	linux-tegra@...r.kernel.org, MLongnecker@...dia.com,
	linux-arm-kernel@...ts.infradead.org, khali@...ux-fr.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: Proposal: I2C device power (Was: hwmon: (lm90) Add power control)

> On Fri, Aug 09, 2013 at 09:57:00AM +0400, Alexander Shiyan wrote:
> 
> > Instead of adding the support of regulators in each device, let's think about
> > whether it is possible to create a global regulator for any device on the I2C bus.
> 
> > I see it like this:
> > We add an extra field in the i2c_board_info structure "power_name" and handle
> > it in the i2c_device_{probe/remove} functions.
> 
> This would need to be an array of supplies, relatively few devices need
> only a single power supply.  This is also not something that should be
> handled in I2C, power is not something that's uniquely needed by devices
> on an I2C bus.

Additional regulators can be handled in the driver, or "parent"-scheme can
be used. Is not it?

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