Re: Trickle charging for rtc-bq32k

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

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
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