Date: Tue, 27 Apr 2021 10:27:32 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: Emmanuel Vadot <manu@bidouilliste.com> Cc: Mark Murray <markm@FreeBSD.org>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: I2C/IIC working on RPI4 8GB? Message-ID: <6432D415-B04D-4DBB-A3B7-B8CBD6665C3C@cs.huji.ac.il> In-Reply-To: <20210426160610.5b91dc44e86ddea169ca8e27@bidouilliste.com> References: <1C2DD11C-B1F6-4C2A-9AB0-5F1553520FF5@FreeBSD.org> <C0038E5F-F218-425B-AFE6-84537CE10155@cs.huji.ac.il> <20210426160610.5b91dc44e86ddea169ca8e27@bidouilliste.com>
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> On 26 Apr 2021, at 17:06, Emmanuel Vadot <manu@bidouilliste.com> = wrote: >=20 > On Sun, 25 Apr 2021 18:41:31 +0300 > Daniel Braniss <danny@cs.huji.ac.il <mailto:danny@cs.huji.ac.il>> = wrote: >=20 >>=20 >>=20 >>> On 25 Apr 2021, at 15:32, Mark Murray <markm@FreeBSD.org> wrote: >>>=20 >>> Hi All, >>>=20 >>> Does anyone here have IIC/I2C working on a CURRENT (I'm running = latest) FreeBSD? >>>=20 >>> I've never seen it work; Last time I had working IIC was on an RPI3. >>>=20 >>> There is a /dev/iic0, and I have a known working RTC on it, but the = scan just times out: >>>=20 >>> [root@grasshopper ~]# i2c -s >>> Hardware may not support START/STOP scanning; trying less-reliable = read method. >>> <TIMEOUT> >>> Scanning I2C devices on /dev/iic0: <none found> >>>=20 >>>=20 >>> I suspect something not-quite-right in DTS land, but I lack the = knowledge to investigate. I've done some random stumbling around in the = dark with overlays and the like, but I've either seen the above error, = or a total lack of /dev/iic0. >>>=20 >>> Thanks! >>>=20 >>> M >>> -- >>> Mark R V Murray >>>=20 >>=20 >> Q1: do you see /dev/iic? >> Q2: i2c -s shows anything? >>=20 >> fianlly, you can try my patch, it works for me, but I understand it?s = a five kilo hammer :-) >=20 > RPI doesn't uses twsi so that will not change a thing. vey true should read Subject: before answering! I guess not all i2c/iic are born equal:-) danny
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