Date: Sun, 4 Nov 2018 19:32:47 +0100 From: Bernd Walter <ticso@cicely7.cicely.de> To: Ian Lepore <ian@freebsd.org> Cc: ticso@cicely.de, freebsd-arm@freebsd.org, Bernd Walter <ticso@cicely7.cicely.de> Subject: Re: How to add custom dts entries Message-ID: <20181104183247.GN79858@cicely7.cicely.de> In-Reply-To: <1541280338.52306.9.camel@freebsd.org> References: <20181103200709.GB79858@cicely7.cicely.de> <1541277990.52306.4.camel@freebsd.org> <20181103205455.GD79858@cicely7.cicely.de> <1541279079.52306.8.camel@freebsd.org> <20181103212031.GF79858@cicely7.cicely.de> <1541280338.52306.9.camel@freebsd.org>
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On Sat, Nov 03, 2018 at 03:25:38PM -0600, Ian Lepore wrote:
> Add a status = "okay" to the spi node in your patch/overlay.
Makes sense.
So the spigen overlay works fine, once I set fdt_overlays in loader.conf
to use the overlay file.
spi0: <BCM2708/2835 SPI controller> mem 0x7e204000-0x7e204fff irq 25 on simplebus0
spibus0: <OFW SPI bus> on spi0
spibus0: <unknown card> at cs 1 mode 0
spibus0: <unknown card> at cs 0 mode 0
spibus0: <unknown card> at cs 0 mode 0
spibus0: <unknown card> at cs 1 mode 0
With my own overlay I do this to install it:
dtc -I dts -O dtb -o rpi-apa102-matrix.dtbo rpi-apa102-matrix.dts
cp rpi-apa102-matrix.dtbo /boot/dtb/overlays
[77]cicely1> cat rpi-apa102-matrix.dts
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2835";
};
/* &spi0 { */
&{/soc/spi@7e204000} {
status = "okay";
apa102led0 {
compatible = "led,apa102";
reg = <0>;
spi-max-frequency = <20000000>;
status = "okay";
};
};
&onewire {
compatible = "w1-gpio";
gpios = <&gpio 4 1>;
};
Still puzzled with the format.
With &spi0 it didn't work, neither with the current format, which is
copied from the spigen.dts.
Neither spi0 attaches, nor the onewire bus.
Some other, mostly beaglebone related examples use a more complex
setup with overlay_ entries and everything inside the compatible block.
Can I have a device.hints please ;-)
ofwdump shows:
...
Node 0x20fc: spi@7e204000
compatible:
62 72 63 6d 2c 62 63 6d 32 38 33 35 2d 73 70 69 00
'brcm,bcm2835-spi'
...
status:
64 69 73 61 62 6c 65 64 00
'disabled'
...
Havn't checked ofwdump with the spigen overlay.
--
B.Walter <bernd@bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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