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

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Date:	Thu, 5 Jan 2012 19:18:25 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Laxman Dewangan <ldewangan.com@...dia.com>
CC:	"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


> From: Mark Brown [mailto:broonie@...nsource.wolfsonmicro.com]
> Sent: Thursday, January 05, 2012 11:59 AM

Thanks for feedback. I have taken care of all your feedback and send
the patch V2.

> > +	/* 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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