Date: Mon, 4 Feb 2019 11:28:25 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: ticso@cicely.de, Bernd Walter <ticso@cicely7.cicely.de>, freebsd-arm@freebsd.org Subject: Re: Problem with PCF8563 RTC on Raspberry Message-ID: <20190204102825.GB41812@cicely7.cicely.de> In-Reply-To: <20190204104434.559c5ade316cc37a918520be@bidouilliste.com> References: <20190204090854.GA41812@cicely7.cicely.de> <20190204104434.559c5ade316cc37a918520be@bidouilliste.com>
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On Mon, Feb 04, 2019 at 10:44:34AM +0100, Emmanuel Vadot wrote:
> On Mon, 4 Feb 2019 10:08:54 +0100
> Bernd Walter <ticso@cicely7.cicely.de> wrote:
>
> > I'm trying to get the RTC on a Waveshare ARPI600 module running on a
> > Raspberry Pi B.
> > This is the Overlay I'm using:
> > /dts-v1/;
> > /plugin/;
> >
> > &i2c0 {
> > status = "okay";
> >
> > rtc: rtc@51 {
> > compatible = "nxp,pcf8563";
> > reg = <0x51>;
> > };
> > };
> >
> > IICbus gets probed during boot:
> > iicbus0: <OFW I2C bus> on iichb0
> > iic0: <I2C generic I/O> on iicbus0
> > iicbus0: <unknown card> at addr 0xa2
> >
> > When I load the nxprtc moduele I get the following error:
> > nxprtc0: <NXP PCF8563 RTC> at addr 0xa2 on iicbus0
> > nxprtc0: cannot set up timer
> >
> > I wonder if I miss something, e.g. setting GPIO.
> > However, for spi0 no GPIO setup was required and the overlay looks
> > quite similar.
>
> Looking at the code it means that the driver didn't managed to talked
> to the chip via i2c, the start_timer function is the first time that
> i2c transfer is happening.
That's my understanding of the situation as well.
> Could be either pinmux problems or frequency (default is 100khz so it
> should work ok).
> What pin are you using to connect to the module ?
Good point.
It is connected to Pin3/5.
Signals scoped turn out that they stay high.
Pinout diagram show that the Pins are named SDA1/SCL1, so probably I'm
just using the wrong controller.
Will give it a test on i2c1 instead.
> Also it seems that the overlay i2c-rtc.dtbo from the Rpi fundation
> list this module but I'm unsure how to use this overlay. It is
> installed via the rpi-firmware package.
--
B.Walter <bernd@bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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