linux-kernel - Re: Trickle charging for rtc-bq32k

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Message-ID: <20140822143853.GA28820@amd>
Date:	Fri, 22 Aug 2014 16:38:53 +0200
From:	Pavel Machek <pavel@....cz>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	a.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: Trickle charging for rtc-bq32k

On Fri 2014-08-22 09:28:52, Wolfram Sang wrote:
> 
> > _But_ this should probably be enabled using device tree entry, right?
> > Unfortunately, the driver is i2c driver, not platform one, so I don't
> > see how to do that easily...
> 
> Trickle charging is usually depending on the hardware setup, so
> devicetree is actually a good place to put it. We'd just need generic
> bindings so that they could be applied to various RTC. Just guessing,
> resistor value would probably be one such property? We would not need
> putting plain register values into DT.

Well, for bq32000 there's selection between "no charging", "diode +
resistor", "different resistor".

> There should be no difference regarding DT between i2c and platform
> drivers.

Do you have example how to acces of_ from i2c driver?

Platform drivers do:

static int palmas_rtc_probe(struct platform_device *pdev)
{
        struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
        struct palmas_rtc *palmas_rtc = NULL;
	int ret;
        bool enable_bb_charging = false;
        bool high_bb_charging;

        if (pdev->dev.of_node) {
	   enable_bb_charging =
	   of_property_read_bool(pdev->dev.of_node,
                                        "ti,backup-battery-chargeable");
					        high_bb_charging =
	   of_property_read_bool(pdev->dev.of_node,
                                        "ti,backup-battery-charge-high-current");

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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