linux-kernel - Re: [PATCH V1] TPS62360: Add tps62360 regulator driver

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Message-ID: <20120106174438.GA3485@opensource.wolfsonmicro.com>
Date:	Fri, 6 Jan 2012 09:44:39 -0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	Laxman Dewangan <ldewangan.com@...dia.com>,
	"lrg@...mlogic.co.uk" <lrg@...mlogic.co.uk>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH V1] TPS62360: Add tps62360 regulator driver

On Thu, Jan 05, 2012 at 07:18:25PM +0530, Laxman Dewangan wrote:

Please fix your mailer to word wrap at less than 80 columns.  I've
reflowed your text for legibility.

> > > +	/* Configure the output discharge path */
> > > +	st = tps62360_reg_modify_bits(tps, REG_RAMPCTRL, BIT(2), BIT(2));
> > > +	if (st < 0)
> > > +		dev_err(tps->dev, "%s() fails in updating reg %d\n",
> > > +			__func__, REG_RAMPCTRL);
> > > +}

> > I rather suspect that if this is worth doing it's also worth doing over
> > suspend...

> The discharge path should be only enabled when the output voltage will go to 0.
> If it stay in non-zero voltage and enabling discharge path  will consume more power.
> In suspend, it is not necessarily that voltage output will be 0 and hence it should not
> be enabled. In shutdown all power goes off from pmu and hence it is worth to enable
> discharge path for quick fall of output voltage.

> > 
> > > + * @vsel: Select the voltage id register.
> > 
> > What's this?
> There is 4 sets of voltage configuration register for voltage output. The power
> on reset values for this registers are different and selection of the voltage
> configuration register is done by 2 pins of the pmu chip which is board dependent.
> Based on board connection, it need to be program the desired voltage configuration
> Register to achieve the desired output.
> 
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