Date: Fri, 24 Mar 2017 11:56:52 -0700 From: Oleksandr Tymoshenko <gonzo@bluezbox.com> To: Karl Denninger <karl@denninger.net> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: i2c on Pi3? Message-ID: <20170324185652.GA65910@bluezbox.com> In-Reply-To: <843bbe39-0b74-0d27-598d-ae16aea52a37@denninger.net> References: <0b83d41a-1a9e-28cc-6ecd-03e6a63a06a2@denninger.net> <DAC58CC9-9D1C-483F-B748-3BD20A8245CE@thehowies.com> <f1c3c4bb-976c-05ba-24ec-212bc9412a33@denninger.net> <20170323175342.GA55627@bluezbox.com> <843bbe39-0b74-0d27-598d-ae16aea52a37@denninger.net>
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Karl Denninger (karl@denninger.net) wrote: > > On 3/23/2017 12:53, Oleksandr Tymoshenko wrote: > > Karl Denninger (karl@denninger.net) wrote: > >> On 3/23/2017 12:34, John Howie wrote: > >> > >>> Hi Karl, > >>> > >>> I can only speak to the Raspberry Pi 2 kernel, but I2C is supported. For an example how to use it from userland, check out a project I posted on github eighteen months ago, that was for the PiFace RTC. > >>> > >>> https://github.com/jhowie/FreeBSDPiFaceRTC > >>> > >>> There are useful routines I created for working with devices on the I2C bus, which you are free to use. They are not RPI2-specific, so they should work on other boards. > > .. skipped .. > >> It works on the Pi2; I am using it in production. > >> > >> The driver appears to be /missing /in the Pi3 kernel. > > Probably it's not enabled in DTB. Try adding this line to config.txt: > > > > dtparam=i2c_arm=on,spi=on > > > Nope, already in the base config.txt file: > > arm_control=0x200 > dtparam=audio=on,i2c_arm=on,spi=on > dtoverlay=mmc > dtoverlay=pi3-disable-bt > device_tree_address=0x4000 > kernel=u-boot.bin I just built latest HEAD, i2c driver is available in GENERIC kernel: # dmesg | grep iic iichb0: <BCM2708/2835 BSC controller> mem 0x7e804000-0x7e804fff irq 31 on simplebus0 iicbus0: <OFW I2C bus> on iichb0 random: harvesting attach, 8 bytes (4 bits) from iicbus0 random: harvesting attach, 8 bytes (4 bits) from iichb0 The driver itself is sys/arm/broadcom/bcm2835/bcm2835_bsc.c Could you run this command on your Pi3 and send output? Thanks sysctl -b hw.fdt.dtb | dtc -I dtb | grep -A 13 'i2c@.*{' -- gonzo
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