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Mon, 26 Oct 2020 13:00:39 -0400 Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=bjornoya.blackshift.org) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kX5rI-0001jE-Bz; Mon, 26 Oct 2020 18:00:36 +0100 Received: from [IPv6:2a03:f580:87bc:d400:24e0:1461:d6e8:7953] (unknown [IPv6:2a03:f580:87bc:d400:24e0:1461:d6e8:7953]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mkl@blackshift.org", Issuer "StartCom Class 1 Client CA" (not verified)) (Authenticated sender: mkl@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id 5DD97582850; Mon, 26 Oct 2020 17:00:34 +0000 (UTC) To: Patrick Menschel , Drew Fustini Cc: Oliver Hartkopp , linux-can@vger.kernel.org, Josh S References: <3ede1c31-9436-a8ec-b7cd-65cee5fa23fc@pengutronix.de> <975a3598-c229-0b9a-df95-c9647f138a3a@hartkopp.net> <20201025105808.2pltif74at3xwtjd@hardanger.blackshift.org> <68846197-98dc-b991-1ec8-a477ceb8d614@posteo.de> <715b3c3b-dbbc-688c-9757-578455c3a607@pengutronix.de> <0667516a-525e-9c4e-ec7a-e4d8a188c338@posteo.de> <92dd7044-8f0d-154b-eb04-8cec1b572dd2@pengutronix.de> From: Marc Kleine-Budde Autocrypt: addr=mkl@pengutronix.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="f46erY9ptBtIV2uFzS5Y6j6wKnYG5qqqU" X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-can@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --f46erY9ptBtIV2uFzS5Y6j6wKnYG5qqqU Content-Type: multipart/mixed; boundary="sFGl1q5nfehv3NiQj0gTaPVx53viiWANV"; protected-headers="v1" From: Marc Kleine-Budde To: Patrick Menschel , Drew Fustini Cc: Oliver Hartkopp , linux-can@vger.kernel.org, Josh S Message-ID: <2a1ddec7-ca28-ae44-dc06-f80f0017bf1f@pengutronix.de> Subject: Re: mcp251xfd on RPi 5.4 downstream References: <3ede1c31-9436-a8ec-b7cd-65cee5fa23fc@pengutronix.de> <975a3598-c229-0b9a-df95-c9647f138a3a@hartkopp.net> <20201025105808.2pltif74at3xwtjd@hardanger.blackshift.org> <68846197-98dc-b991-1ec8-a477ceb8d614@posteo.de> <715b3c3b-dbbc-688c-9757-578455c3a607@pengutronix.de> <0667516a-525e-9c4e-ec7a-e4d8a188c338@posteo.de> <92dd7044-8f0d-154b-eb04-8cec1b572dd2@pengutronix.de> In-Reply-To: --sFGl1q5nfehv3NiQj0gTaPVx53viiWANV Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 10/26/20 5:51 PM, Patrick Menschel wrote: >> On 10/26/20 3:50 AM, Drew Fustini wrote: >>> I'm seeing this message which makes me think my issue is that I am no= t >>> setting the oscillator as a dtoverlay param. >>> >>> [ 6.873081] CAN device driver interface >>> [ 6.879904] DEBUG mcp251xfd mcp251xfd_probe(): ENTER >>> [ 6.880068] spi_master spi0: will run message pump with realtime p= riority >>> [ 6.921312] mcp251xfd spi0.0 (unnamed net_device) (uninitialized):= >>> Failed to detect MCP251xFD (osc=3D0x00000000). ^^^^^^^^^^ Contents of OSC register. >>> [pi4] >>> dtoverlay=3Dmcp251xfd-spi0-0 >> >> Are you using CS0 of spi0? >> What's the frequency of your OSC? >=20 > mcp251xfd_osc_invalid(osc) is true according to the string. >=20 > https://github.com/marckleinebudde/linux/blob/v5.4-rpi/mcp251xfd-202010= 22-54/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c#L552 ACK The OSC register would never contain 0x0. So when reading 0x0 (or 0xff) y= ou have not read anything. This is what the "invalid" test does. This could have several reasons, e.g. mcp2518fd is not on SPI0 CS0, or th= e OSC is 20 MHz, but the DT specifies an OSC of 40 MHz. Marc --=20 Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | --sFGl1q5nfehv3NiQj0gTaPVx53viiWANV-- --f46erY9ptBtIV2uFzS5Y6j6wKnYG5qqqU Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAl+XAKUACgkQqclaivrt 76l9XAgAtGVCIQwmSo0Y5AtmusNRBdequrEGv8YjbANxyFMXc6pgYFXo2++mRk61 55BNI5jGAdNgEydD2tCQr3UABx0jiRbMPMVge8q8WIbz8TT9FnWMx4x9Vw4/xdRV yEqMQj7+00bS42P//gaJzF4oHRnDufn9DBbqf4OFAsH0qbhsxVHL2uZeTc8Qvsxo X1RAehyOw/fgMzcW+4qjN3yX5r4QbwoHKdHqCyg/Fkpw56wW3rNBqzqsaHGlGkvH ywttb2Th13T0sT337qDGGi1/kPlqXXrb10Ux9L/OtmpCExbFVaM1vw8i5hKgS4ID nurNEF4fW2GzJXJTzVmXU830FFSdLQ== =tvCa -----END PGP SIGNATURE----- --f46erY9ptBtIV2uFzS5Y6j6wKnYG5qqqU--