Date: Mon, 03 Apr 2017 22:45:36 +0000 From: ash <ash@aeria.net> To: Oleksandr Tymoshenko <gonzo@bluezbox.com> Cc: <freebsd-arm@freebsd.org> Subject: Re: BBB spi dts follow up Message-ID: <7d96caf9-b9a2-4b2b-8d5d-e9925be7c95d@aeria.net> In-Reply-To: <20170401231324.GA50794@bluezbox.com> References: <3b095b47-f3fb-488f-92f3-518e69d282c1@aeria.net> <20170401231324.GA50794@bluezbox.com>
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On Saturday, 1 April 2017 23:13:24 UTC, Oleksandr Tymoshenko wrote: > ash (ash@aeria.net) wrote: >> I decompiled the stock dts to get started with: >>=20 >> #dtc -I dtb -O dts /boot/dtb/beaglebone-black.dtb > ... skipped ... >> But still no /dev/spi0 device. Any pointers are welcome. > There is no /dev/spi0 in FreeBSD at the moment. The only > way to access SPI from userland is by using spigen device. > With later HEAD builds (post r314934) you can load it as > a module: "kldload spigen" otherwise you'll need to add it > to kernel config as a "device spigen". > > spigen functionality is very limited, you can't specify > SPI mode or CS line. General procedure is to open > /dev/spigen0 with O_RDWR and then use ioctls to transfer > data. You can use this example as a simple reference: > > https://github.com/gonzoua/freebsd-embedded-demos/blob/master/libssd1306/ss= d1306_spi.c#L86 > #kldload /dtmp/spigen.ko =20 :root:~:22:40:48:468beaglebone spigen0: <SPI Generic IO> at cs 0 mode 0 on spibus0 *grin* Thank you so much.=20 --=20 -ash
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