Date: Thu, 21 Mar 2019 13:34:20 -0500 From: Jedi Tek'Unum <jedi@jeditekunum.com> To: Ian Lepore <ian@freebsd.org> Cc: Daniel Braniss <danny@cs.huji.ac.il>, freebsd-arm@freebsd.org Subject: Re: allwinner i2c [was: Options for FBSD support with LCD device - new project] Message-ID: <8AF0CF9D-BD5D-42AC-B1BF-27A056B3D7C2@jeditekunum.com> In-Reply-To: <c1f805119a09de88d11bf72f99db60e2a2a18577.camel@freebsd.org> References: <ad61a598-53af-02a5-41db-0128da7d1a34@optiplex-networks.com> <CAF19XBLAjP4yKtGSBzA4QdT346Bnbnr8MutQNZgmERLbJkWAyA@mail.gmail.com> <8df902f6-20a3-31c4-71ac-91f5d5fdf50d@optiplex-networks.com> <0ecf23e129ca7ac6a92a01bbb34c03f1ac8c6dc8.camel@freebsd.org> <e5d42c67-e1f2-ede1-965f-c89226de46da@optiplex-networks.com> <89f5b8d1ab0614ac8d88b5d5f1afc63e640c3c17.camel@freebsd.org> <4EB5C6C1-7DB9-4DEE-BB23-CD1259581271@jeditekunum.com> <004ddba628b94b80845d8e509ddcb648d21fd6c9.camel@freebsd.org> <C47DE503-1E0E-4475-B62B-0055D2A582E7@cs.huji.ac.il> <c1f805119a09de88d11bf72f99db60e2a2a18577.camel@freebsd.org>
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On Mar 20, 2019, at 10:31 AM, Ian Lepore <ian@freebsd.org> wrote:
>=20
> On Tue, 2019-03-19 at 08:28 +0200, Daniel Braniss wrote:
>> I have several allwinner SoC, mainly from FriendlyArm, and neither =
i2c or SPI work.
>> I have a hacked i2c that mostly works, but hangs sometimes :-), =
mainly
>> timing issues of which I have no idea how to fix.
>> I=E2=80=99m willing to help here but my knowledge of the twsi tends =
to zero.
>> hint hint =E2=80=A6
>>=20
>> cheers,
>> danny
>=20
> Iirc, allwinner requires working i2c even to boot, because the boards
> have i2c PMIC chips on them. I wonder if it's a case where a few =
small
> commands to the pmic work fine but bigger transfers fail? I dunno,
> anything more you can say about the problem would help.
My H5 board, a NanoPi NEO 2, running vendor supplied Linux has =
/dev/i2c-0 through i2c-3.
Only i2c0 is available externally. Detect shows
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --=20
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --=20
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --=20
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- 3e 3f=20
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --=20
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --=20
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --=20
70: 70 71 -- 73 -- -- -- -- =20
3c is the OLED Hat. The rest are all my boards (73 is mux and the rest =
are SX1509s).
The only other scan that shows anything is i2c3 device 30. Maybe that is =
the PMIC?
i2c1 and i2c2 scan very slowly and eventually show nothing. I suppose =
they aren=E2=80=99t pulled up.
Daniel, I haven=E2=80=99t had any problems with hangs (Linux) but I do =
have intermittent troubles that could be due to a variety of things. =
I=E2=80=99ve yet to see anything =E2=80=9Crock solid=E2=80=9D about =
these boards.
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