linux-kernel - Re: [PATCH 3/4] power: Add Qualcomm SMBB driver

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Date:	Sat, 25 Jul 2015 17:42:00 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Courtney Cavin <courtney.cavin@...ymobile.com>
Subject: Re: [PATCH 3/4] power: Add Qualcomm SMBB driver

Hi,

On Thu, Jun 18, 2015 at 02:13:44PM -0700, Bjorn Andersson wrote:
> Add the Qualcomm Switch-Mode Battery Charger and Boost driver, found in
> pm8941.

The driver's sourcecode looks fine to me. I'm not convinced by all
those new DT properties, though. I think "watermark" should be
replaced with "threshold" and "control" with "current" for all
properties. Additionally some comments. Note, that I only used the
driver's sourcecode as reference, since the DT binding document
was neither send to me, nor to linux-pm mailinglist.

 * battery-charge-control-limit

It's unclear, what this property is used for. Is the limit only
for "normal" charging or also for fast charging?

 * fast-charge-low-watermark
 * fast-charge-high-watermark

Add a unit to this property. Maybe "fast-charge-start-voltage"
and "fast-charge-stop-voltage"?

 * fast-charge-safe-voltage
 * fast-charge-safe-current

These properties are fine to me. I wonder if they should be named
fast-charge-max-*, though.

 * auto-recharge-low-watermark

I think the "low" can be dropped. Instead a -voltage
should be appended, since it could also be a percentage.

 * minimum-input-voltage

Add a vendor prefix to this property.

 * usb-charge-control-limit

I suggest to remove this from DT. If no USB detection is
implemented, the default should be 100mA according to USB
standard.

 * dc-charge-control-limit

Please add a vendor prefix and I think "dc-current-limit"
is a more fitting name.

 * disable-dc

Please add a vendor prefix.

 * jeita-extended-temp-range

Looks ok to me.

-- Sebastian

smbb_charger_attr_parse

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